JP2003059196A - Data recording method, data recording apparatus, and recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain after-recording while reproducing an AV stream without interruption even when a disk drive with a comparatively low data transfer speed records the AV stream distributed on a disk. SOLUTION: The data recording method is configured such that first data comprising video or audio data and second data reproduced synchronously with the first data are consecutively located on a recording medium to configure a first unit to record the data on the recording medium, and in the method the size of the recording unit of the first unit is decided on the basis of any of pickup mobile performance, a data transfer rate, a data bit rate, and second data rewrite control while reproducing the first data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data recording method and a data recording apparatus for recording / reproducing video data and audio data on / from a randomly accessible recording medium such as a hard disk and an optical disk.

[0002]

2. Description of the Related Art Digital recording / reproducing apparatuses for video and audio using a disk medium are becoming popular. In these, there is a demand for a technology that realizes an after-recording (post-recording) function at a low cost, like the tape media. The post-recording function is a function to add information, particularly audio, to the audio or video that has already been recorded.

As a conventional technique for realizing an after-recording function using a disk medium, for example, Japanese Patent Laid-Open No. 5-234 is known.
A disk recording / reproducing device described in Japanese Patent No. 084 is known.

This technique takes advantage of the fact that the data read period is shorter than the program playback period, and is input between the time when the data is read from the disc currently being played into the memory and the next data is read. Since the post-record audio data is written to the disc, the post-record can be realized even if there is only one disc recording / reproducing means.

The program reproduction period is a reproduction period unique to each program such as video and music. For example, a one-minute video cannot be said to have been reproduced correctly if it is not reproduced within one minute even if the reproduction means is changed.

FIG. 22 shows the recording format of a disk in the prior art. The disk is composed of a row of ECC (Error Correction Coding) blocks. EC
The C block is the minimum unit for encoding, and the parity for error correction is added to the data and encoding is performed.

When data is read, necessary error data is taken out after performing read error correction in this unit. On the other hand, when rewriting the data, first, the data is read in ECC block units, the necessary part is rewritten to the error-corrected data, the error code is added again, and the data is recorded on the disc. This means that even if one byte is rewritten, it is necessary to read and write the entire ECC block containing that byte.

Video and audio are arranged in the ECC block in the order of an after-recording audio block, an original audio block, and an original video block, as shown in FIG. 22 (b).

Each block has post-recording audio, original audio, and
Includes original video. The original audio block and the original video block are collectively referred to as an original block.

When recording an original program (video before recording after-recording audio), dummy data is written in the after-recording audio block.

Next, the operation during dubbing in the prior art will be described with reference to FIG. Here, FIG.
The graph of (a) shows the temporal relationship of each process such as reading from the disc, reproduction and recording, and the symbol in the arrow corresponds to the vertical axis in the graph of FIG. Indicates the position of the data on the disk. Figure 2
3 (b) schematically shows the position of the head in the disk, and the graph of FIG. 17 (c) schematically shows the proportion of the program data in the buffer memory.

Here, the program is s11 in the disk.
It is arranged in the continuous area of ~ s18 ~, s11 ~ s13, s13 ~ s1
It is assumed that the areas 5 and s15 to s17 respectively correspond to the ECC blocks, and the areas s11 to s12, s13 to s14, s15 to s16, and s17 to s18 respectively correspond to the post-record audio blocks.

At time t1, the area up to s13 has already been stored in the buffer memory, the data recorded in the area from s11 to s13 is decoded and reproduced, and the post-recording voice of the data is input. Encoding is taking place.

At times t1 to t3, the data in the areas s13 to s15 are read from the disk and stored in the buffer memory and the post-record buffer. The after-recording buffer stores the read ECC block as it is, and has a configuration similar to that of FIG. Time t2 is the time at which the decoding and reproduction of the data recorded in the areas s11 to s13 that were performed at the time t1 are completed.

After the time t2, the data in the areas s13 to s15 read at the times t1 to t3 are decoded and reproduced, and
The post-recording voice of the data is input and encoded. Decoding and playback of the data in this area s13 to s15 is time
Until t5.

The post-recording voice input by time t2 is
Encoding ends at least by time t3. Time t3
At, the after-recording audio input by time t2 is recorded on the disk medium. At this time, when accessing s11, a time for waiting for rotation of the disk is required, but since it is a short time compared with the time for reading and writing the disk, it is not considered here.

Writing post-recording audio to a disc is as follows.
It is performed from time t3 to t4. When the writing to the disk ends at time t4, the data in the areas s15 to s17 is read from the disk from time t4. In this way, the same processing is repeated thereafter.

In the above-mentioned conventional technique, the fact that the reading time is shorter than the data reproducing time by performing the information compression is used, and the recording / reproducing means is used for recording and reproducing in a time-division manner. The dubbing is realized by only one recording / reproducing means. A similar technique is disclosed in Japanese Patent Laid-Open No. 2001-118362.

[0019]

However, in the above-mentioned conventional disc recording / reproducing apparatus, it is preferable that the bit rate of the AV stream is sufficiently lower than the data transfer rate of the disc, but there is a margin of data input / output speed. If it is small, it is difficult to play back without interruption while performing post-recording.

The present invention has been made in view of the above-mentioned problems, and enables a disk drive having a relatively low data transfer speed to be reproduced without interruption even if an AV stream is recorded on the disk in a divided manner. The purpose is to enable post-recording.

[0021]

According to a first aspect of the present invention, on a recording medium, first data consisting of video or audio and second data reproduced in synchronization with the first data are recorded. A data recording method for recording data on a recording medium by continuously arranging the first unit to form a first unit, wherein the recording unit size of the first unit is set to a pickup movement performance, a data transfer rate, and a data transfer rate. It is determined based on one of a bit rate and control of rewriting the second data while reproducing the first data.

The second invention of the present application is characterized in that an upper limit is set when determining the size of the recording unit of the first unit.

A third invention of the present application is characterized in that a lower limit is set when determining the size of the recording unit of the first unit.

According to a fourth invention of the present application, first data consisting of video or audio and second data reproduced in synchronization with the first data are arranged continuously on a recording medium. In the data recording method of forming a first unit and recording on a recording medium, the amount of memory used when rewriting the second data is set as follows: pickup movement performance, data transfer rate, data bit rate, It is characterized in that the determination is made based on one of the control of data rewriting in item 2.

A fifth aspect of the present invention is characterized in that the control for rewriting the second data is control for rewriting the entire first unit.

A sixth aspect of the present invention is characterized in that the control for rewriting the second data is control for rewriting only the second data.

A seventh aspect of the present invention is characterized in that the control of the second data rewriting is performed after once reading an error correction block including at least one of a start end and an end of the second data. To do.

The eighth invention of the present application is characterized in that the error correction block is read at the time of reading the first data.

The ninth invention of the present application is characterized in that the first unit is composed of one or more second units that can be independently reproduced.

According to a tenth aspect of the present invention, first data composed of video or audio and second data reproduced in synchronization with the first data are continuously arranged on a recording medium. A data recording method of forming a first unit and recording the same on a recording medium, wherein the first unit is a second unit that can be independently reproduced, and the second unit includes the second unit. A second unit for storing the second data is included, and the size of the recording unit of the first unit is set to the pickup movement performance, the data transfer rate, the data bit rate, and the first data while reproducing the first data. It is determined based on one of the second data rewriting control, and the second data rewriting control is a rewriting control for every one or more third units.

According to an eleventh aspect of the present invention, first data composed of video or audio and second data reproduced in synchronization with the first data are arranged continuously on a recording medium. A data recording method for forming a first unit on a recording medium and recording the same on a recording medium, wherein the first unit is composed of a second unit that can be independently reproduced, while reproducing the first data. The control of rewriting the second data is control of rewriting only the second data, and the size of the recording unit of the first unit is determined based on the reproduction time of the second unit. And

In a twelfth aspect of the present invention, only the first data composed of video or audio and / or the second data reproduced in synchronization with the first data are continuously arranged on a recording medium. A data recording method for forming a first unit and recording it on a recording medium, the method for determining the recording unit of the first unit being different depending on whether the second data exists or not. It is characterized by

A thirteenth aspect of the present invention is characterized in that the recording unit of the first unit is defined by a reproduction time.

According to a fourteenth invention of the present application, first data composed of video or audio and second data reproduced in synchronization with the first data are arranged continuously on a recording medium. A data recording method of forming a first unit and recording it on a recording medium, wherein a reference bit rate for securing an area in the first unit for storing the second data is It is characterized in that it is set independently of the bit rate of the first data.

A fifteenth aspect of the present invention is characterized in that the reference bit rate for securing the area in the first unit is the maximum bit rate of the second data.

A sixteenth aspect of the present invention is characterized in that the reference bit rate for securing the area in the first unit is set to a bit rate lower than the bit rate of the voice in the first data. And

In a seventeenth invention of the present application, only the first data composed of video or audio and / or the second data reproduced in synchronization with the first data are continuously arranged on a recording medium. In the data recording method, the first unit is configured to record on a recording medium, and when the second data does not exist, the first unit is continuously arranged on the recording medium. It is composed of a plurality of second units as a unit, and when the second data exists, the first unit is composed of the second unit alone.

In an eighteenth aspect of the present invention, first data composed of video or audio and second data reproduced in synchronization with the first data are arranged continuously on a recording medium. A data recording method for forming a first unit and recording on a first recording medium, wherein the second data is recorded on the second recording medium once when the second data is recorded while reproducing the first data. Is recorded in the recording area of.

In a nineteenth aspect of the present invention, after the second data recording, the recording area on the second recording medium is moved to the first unit on the first recording medium. And

A twentieth invention of the present application is the second recording medium, which cannot be recorded on the first recording medium during reproduction of the first data.
Only the above data is recorded on the second recording medium.

A twenty-first invention of the present application is characterized in that the second recording medium is the same recording medium as the first recording medium.

A twenty-second aspect of the present invention is characterized in that the recording area on the second recording medium is an area on the first unit.

The twenty-third invention of the present application is characterized in that the second recording medium is a semiconductor memory.

In a twenty-fourth aspect of the present invention, the first data consisting of video or audio and the second data reproduced in synchronization with the first data are arranged continuously on the recording medium. A data recording device that constitutes a first unit and records the data on a recording medium, wherein the reproduction time of the first unit is
It is characterized in that it comprises means for making a determination based on one of the pickup movement performance, the data transfer rate, the data bit rate, and the second data rewriting control.

In a twenty-fifth aspect of the present invention, first data consisting of video or audio and second data reproduced in synchronization with the first data are arranged continuously on a recording medium. A data recording device that constitutes a first unit and records on a first recording medium, wherein when recording the second data while reproducing the first data, the data is recorded on the second recording medium once. Is provided in the recording area.

A twenty-sixth aspect of the present invention is a recording medium on which first data consisting of video or audio and second data reproduced in synchronization with the first data are recorded.
Data of a predetermined reproduction time in the first data and second data reproduced in synchronization with the data are managed as a first unit, and the reproduction time of the first unit is a pickup. It is characterized in that it is determined based on one of the moving performance, the data transfer rate, the data bit rate, and the second data rewriting control.

The twenty-seventh invention of the present application is a data recording method for recording, on a recording medium, first data composed of video or audio and second data reproduced in synchronization with the first data. Therefore, the data for a predetermined reproduction time in the first data and the second data reproduced in synchronization with the data are managed as a first unit, and the reproduction time of the first unit is managed. Is determined based on the number of physical discontinuities on the recording medium in the first unit.

The twenty-eighth invention of the present application is characterized in that only the second data is controlled so as to be physically and continuously recorded on the recording medium.

A twenty-ninth aspect of the present invention is characterized in that the first data in the first unit is composed of a set of second units which are independently reproducible units.

The thirtieth invention of the present application is the first invention consisting of voice.
Is a data recording method for recording the data in a recording medium, which comprises video and audio with which continuous recording time of the first data on the recording medium may be reproduced in synchronization with the first data. It is characterized in that it is determined based on the maximum bit rate of the second data.

A thirty-first invention of the present application is a data recording apparatus for recording, on a recording medium, first data composed of video or audio and second data reproduced in synchronization with the first data. A unit for managing, as a first unit, data for a predetermined reproduction time in the first data and second data reproduced in synchronization with the data; Means for determining the reproduction time based on the number of physical discontinuities on the recording medium in the first unit.

A thirty-second invention of the present application is a recording medium on which first data composed of video or audio and second data reproduced in synchronization with the first data are recorded.
Data of a predetermined reproduction time in the first data and second data reproduced in synchronization with the data are managed as a first unit, and the reproduction time of the first unit is It is characterized in that it is based on the number of physical discontinuities on the recording medium in the first unit.

[0053]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

<System Configuration> FIG. 1 is a block diagram showing a schematic configuration of an after-recordable video disk recorder commonly used in this embodiment. As shown in FIG. 1, this device includes a bus 100, a host CPU 101, a RAM 102, and a ROM.
103, user interface 104, system clock 10
5, optical disk 106, pickup 107, ECC decoder 10
8, ECC encoder 109, playback buffer 110, recording / post-recording buffer 111, output multiplexer 112, multiplexer 113, multiplexing buffer 114, audio decoder 11
5, video decoder 116, audio encoder 117, video encoder 118, and a camera, microphone, not shown,
It is equipped with a speaker and a display.

The host CPU 101 receives the demultiplexer 112, the multiplexer 113, and the pickup 10 via the bus 100.
7, also not shown, the audio decoder 115,
It communicates with the video decoder 116, the audio encoder 117, and the video encoder 118.

During reproduction, the data read from the optical disc 106 through the pickup 107 is error-corrected by the ECC decoder 108 and temporarily stored in the reproduction buffer 110. The demultiplexer 112 distributes the data in the reproduction buffer to an appropriate decoder according to the type according to the data transmission request from the audio decoder 115 and the video decoder 116.

On the other hand, at the time of recording, the data compressed and encoded by the audio encoder 117 and the video encoder 118 is once sent to the multiplexing buffer 114, AV-multiplexed by the multiplexer 113, and the recording / post-recording buffer 111. Sent to. Recording / recording buffer 11
An error correction code is added to the data in 1 by the ECC encoder 109, and the optical disc 106 is passed through the pickup 107.
Recorded in.

MP is used as the audio data encoding system.
EG-1 Layer-II and MPEG- for the video data encoding method.
Use 2 respectively.

The optical disk 106 is a removable optical disk in which recording and reproduction are performed spirally from the outer circumference to the inner circumference. An ECC block is composed of 16 sectors for error correction, with 2048 bytes as one sector. When rewriting the data in the ECC block, read the entire ECC block containing the data, perform error correction, rewrite the target data, add the error correction code again, configure the ECC block, and write it to the recording medium. Need to record.

Further, the optical disc 106 here adopts ZCAV (constant zone angular velocity) in order to improve recording efficiency, and the recording area is composed of a plurality of zones having different rotational speeds.

<File System> Next, in the present embodiment, a file system is used to manage various information on the optical disc 106. The file system contains
UDF (Universal Disk Format) considering interoperability with PC
To use. Various management information and AV on the file system
Streams are treated as files.

User area is a logical block of 2048 bytes
It is managed in one-to-one correspondence with the sector. Each file does not need to be composed of physically continuous logical blocks on the disk, and may be recorded in a distributed manner in logical block units. The free area is managed in logical block units using the Space Bitmap.

<File Format> Further, in this embodiment, as a format for AV stream management,
Use the QuickTime file format. The QuickTime file format is a multimedia data management format developed by Apple Inc., and is widely used in the personal computer (PC) world.

The QuickTime file format is composed of management information and AV stream. Here, both are collectively called a QuickTime movie. Both may be in the same file or in separate files. If the files exist in the same file, the structure shown in FIG. Various information is stored in a common structure called atom. Management information is stored in a structure called Movie atom
The stream is stored in the structure called Movie data atom.

The management information in the Movie atom includes a table for deriving the relative position in the file of AV data corresponding to an arbitrary time in the AV stream, attribute information of audio data and video data, It includes external reference information, which will be described later.

On the other hand, when the management information and the AV stream are stored in different files, the configuration shown in FIG. 2B is adopted. The management information is stored in the structure called Movie atom, but the AV stream does not need to be stored in atom. At this time, the Movie atom "externally references" the file containing the AV stream.

External reference can be made to a plurality of AV stream files as shown in FIG. 2 (c). With this mechanism, the AV stream itself is apparently edited without physically moving. So-called "non-linear editing" and "non-destructive editing" are possible.

The structure of the Movie atom is shown in FIG. Each atom is configured to contain a specific atom.
A Movie atom stores a Movie header atom that manages the overall attributes of the program managed by that Movie atom and information about each track included in that program 1
Contains more than one Track atom.

Various information is stored in each atom.
Although it includes atoms, the description will be limited to those necessary for understanding the present invention. Movie atom can store atom called User data atom for managing unique information that is not defined in QuickTime format.

In the present invention, in the User data atom, as shown in FIG.
As shown in (b), the structure of the AV stream (Reco.
(information about the configuration of the rd Unit and Video Unit)
The cord-unit description atom and the X descriptor atom that manages the set performance atom that stores the information (seek time, disk transfer speed, etc.) related to the performance of the device necessary to play the program are additionally defined.

<First Embodiment> Next, the first embodiment of the present invention will be described.
An embodiment of the above will be described with reference to FIGS.

<Form of AV Stream> First, the structure of the AV stream in this embodiment will be described with reference to FIGS. 4 to 6. As shown in FIG. 4, the AV stream is composed of an integral number of Record Units (RUs). RU is a unit for continuously recording on the disc.

The length of the RU is such that no matter how the RUs composing the AV stream are arranged on the disc, seamless reproduction (playback without interruption of pictures and sounds during reproduction) and real-time dubbing (video for dubbing) (Recording audio while seamlessly playing) is guaranteed.

This setting method will be described later. Also,
Configure the stream so that the RU boundary matches the ECC block boundary. Due to these properties of the RU, even after the AV stream is recorded on the disc, the arrangement of the RU unit can be easily changed on the disc while ensuring the seamless reproduction.

The RU is composed of an integral number of Video Units (VUs). The VU is a unit that can be independently reproduced, and therefore can be an entry point when reproducing. VU configuration is a post-recording compatible stream (post-recording compatible stream)
And the stream that does not support post-recording (stream that does not support post-recording) differ.

First, in a non-post-recording compatible stream
The VU configuration is shown in FIG. A VU is an integer number of GOPs (groups of pictures) that store video data of approximately 1 second and an integer number of AAUs (audio access unit) that stores main audio data that is played back at the same time. Composed. GOP is a unit of compression in the MPEG-2 video standard, and is composed of a plurality of video frames (typically about 15 frames).

AAU is a unit of compression in the MPEG-1 Layer II standard and is composed of 1152 sound wave sample points.
When the sampling frequency is 48kHz, the playback time per AAU is 0.024 seconds. In the VU, AAU and GOP are arranged in this order in order to reduce the delay required for AV synchronized playback.

The reproduction start timing of the first video frame in the VU must be before the reproduction start timing of the first AAU, and the time difference must be less than the reproduction time of 1 AAU. The VU needs to be continuously recorded on the disc in a predetermined unit or more for seamless reproduction.
The unit will be described later.

A Sequence Header (SH) is placed at the beginning of the video data in the VU so that the VU can be independently reproduced.
Also, if the attributes of the subsequent VU and video encoding (for example, the number of pixels that make up the screen) change, Se at the end
Place the quence end code (SEC).

The VU playback time is defined as the number of video frames included in the VU multiplied by the video frame period.
When configuring an RU by combining an integral number of VUs, the end of VU is set to 0 to align the start and end of the RU with the ECC block boundary.
Fill with.

On the other hand, VU in the post-recording compatible stream
The configuration is as shown in FIG. Post Recordin as an area for storing post-recording (sub-audio) data that plays at the same time as video and main audio data at the beginning of the VU in the non-post-recording stream.
g Unit (PRU) is provided. Here, the PRU is placed in front of the area for storing the main audio, but it may be reversed.

The area size of the PRU is selected from one kind or a limited kind regardless of the bit rate of the main audio. This is because, if the bit rate can be freely set, a device having an after-recording function needs to support audio encoding at any bit rate.

For example, the PRU area size is secured based on the maximum reproducible audio bit rate regardless of the main audio bit rate. For example, even if the bit rate of the main audio is 128 kbps, the area size of the PRU included in the same VU is secured at the maximum reproducible bit rate (for example, 256 kbps).

In this case, when the after-recording is performed by another device, the after-recording audio can be recorded at the bit rate supported by the device without being restricted by the bit rate of the audio of the device that originally recorded the AV stream, and the after-recording is performed. The burden of encoding support on the device is reduced.

On the other hand, there is also a method of ensuring the PRU area size based on a low audio bit rate regardless of the bit rate of the main audio. This makes it possible to save even a small amount of the recording capacity of the disc for many users who do not normally perform post-recording but occasionally need it. Since post-record input is often human voice,
Even with a low bit rate, there is usually no problem with sound quality.

Here, the target of the post-recording is the video and the main audio, and the data recorded in the post-recording is the sub audio data, but the following description is not particularly limited thereto.

<AV Stream Management Method> Regarding the position and reproduction time of each RU or each VU on the AV stream, the above-mentioned Mo
Manage with vie Atom. Details are omitted because they are unnecessary for the description here.

<Disc Arrangement Determining Method> First, a method for determining the RU reproduction time in the post-recording compatible stream will be described. In this determination method, in order to ensure compatibility between devices, a reference device (reference device model) and a reference post-recording algorithm (reference post-recording algorithm) are assumed, and then post-recording is performed using them. RU playback time is determined so that seamless playback does not fail when performing.

First, the reference device
The model will be described with reference to FIG. 7. The reference device model is one pickup and an ECC encoder / decoder 501 and track buffer 50 connected to it.
2, a demultiplexer 503, a post-recording buffer 504, an audio encoder 509, a video buffer 505, an audio buffer 506, a video decoder 507, and an audio decoder 508.

In this model, since there is only one pickup, reading of reproduction data from the disc and recording of post-recording data on the disc are performed in a time division manner. When reading the playback data from the disc, the PRU is also read. ECC block containing the read PRU (PRU block)
Is sent from the track buffer 502 to the after-recording buffer 504.

The audio encoder 509 outputs to the after-recording buffer 504 at the AAU cycle. With this output
The corresponding PRU block in the post-recording buffer 504 is overwritten. The post-recording data is recorded by recording the PRU block in a predetermined ECC block.

The reason why the PRU block is sent from the track buffer 502 to the after-recording buffer 504 in this model is as follows. In this embodiment
In the AV stream, since the PRU boundary and the ECC block boundary do not match, not only PRU data but also other data (video data of the immediately preceding VU or audio data of the same VU) is stored in the ECC block including the PRU boundary. included.

Therefore, when recording data in PRU, P
It is necessary to read the ECC block including the RU boundary into the memory once. It may be possible to read to the memory immediately before recording the PRU, but since the ECC block including the PRU boundary is always read when reading the playback data,
By temporarily holding the ECC block including the PRU read at the time of reading the reproduction data in the post-recording buffer 504, the rereading of the ECC block including the PRU boundary is omitted.

The seamless reproduction in this model requires at least 1 in the track buffer 502 at the start of VU decoding.
Guaranteed if there are individual VUs. The data input speed of the audio frame data to the ECC encoder 501 and the data output speed of the ECC decoder 501 are Rs.

The maximum period during which reading and recording by access are stopped is Ta. In addition, short access (100
Let Tk be the time required for a track). It should be noted that these periods include seek time, rotation waiting time, and the time until the data first read from the disk after access is output from the ECC. In this embodiment, Rs = 20Mbps, T
Let a = 1 second and Tk = 0.2 seconds.

Next, the reference dubbing algorithm will be described with reference to FIG. In addition, in FIG.
The numbers (1) to (9) correspond to the numbers (1) to (9) in the following description. The outline of the algorithm is as follows.

(1) Read the reproduction data. (2)
At the same time as the encoding of the audio data corresponding to RU # N which is the Nth RU is completed, the pickup is moved to RU # N. (3) Corresponds to PRU # 1 which is the first PRU of RU # N
Record the PRU block.

(4) Move the pickup to PRU # 2, which is the second PRU in RU # N. (5) Record the PRU block corresponding to PRU # 2. (6) Pickup transfer to the next PRU, PRU
Repeat block recording. (7) Record the PRU block corresponding to PRU # M, which is the last PRU in RU # N. (8) Return the pickup to the original reading position. (9) Resume reading of the reproduction data. The above operation is repeated.

In the reference device model, when post-recording is performed by using the reference post-recording algorithm, it can be guaranteed that the track buffer 502 does not underflow if the following conditions are satisfied.

The condition is any RU in the AV stream.
RU # i, the maximum playback time is T (i), the maximum read time including break jump is Tr (i), and the maximum recording time of PRU in RU # i is Tw (i). i) ≧ Tr (i) + Tw (i) ... <Formula 1> is satisfied.

This is because this expression is for any n, which is a sufficient condition for seamless playback.

[0102]

[Equation 1]

This is because the sufficient condition is satisfied.

Since the after-recording data is recorded on the disk in synchronization with the completion of the PRU encoding, the data in the after-recording buffer 504 does not accumulate and the after-recording buffer 504 does not overflow.

Tr (i) in <Equation 1> is the maximum bit rate of audio and video in the AV stream and the maximum bit rate of audio used as the reference for securing the PRU area size, respectively.
When v and Rp are set, Tr (i) = Te (i) × (Rv + Ra + Rp) / Rs + Ta ... <Equation 3>.

The first term on the right side represents the read time of RU # i.
The second term on the right side represents the maximum access time due to the split jump that occurs immediately after reading RU # i. Further, Tw (i) is Tw (i) = 2Ta + (M-1) × Tk + Te (i) × Rp / Rs + (2M-1) × Ly / Rs ... <Equation 4>.

Here, the first term on the right side indicates the round-trip access time to the RU. The maximum access time Ta is used as the round-trip access time to the PRU for the following reason.

Should be recorded as the currently read track
The distance of the track in which the PRU exists depends on the delay time due to the reproduction buffer at that time. However, the delay time differs depending on the playback buffer size, and even if the buffer size is the same, it also varies when the reading is temporarily stopped due to a shock immediately before. That is, the access distance is indefinite, and therefore it is necessary to estimate the worst value.

The second term on the right side is the total time for jumping between PRUs. Incidentally, M is the number of VUs constituting RU # i.
The third term on the right side represents the total time for recording the PRU included in RU # i on the disc. The fourth term on the right side represents the maximum recording time other than the post-recording data in the ECC block including both ends of the PRU.

Here, Ly is an ECC block size of 32K.
It becomes B. The reason for the need for such a term is that both ends of the PRU are EC
This is because it does not always coincide with the C block boundary, and therefore at the time of PRU recording, a maximum of 2 ECC blocks larger than the size of the PRU will be recorded. However, the first PRU of the RU
Is (2M-1) because it is located on the ECC block boundary.

Here, since M depends on Te (i), M is set to Te
Consider expressing in (i). Letting Tvmin be the minimum value of VU playback time in RU (i), M ≦ ceiling (Te (i) / Tvmin) ≦ Te
(i) / Tvmin + 1. Note that ceiling (x) is a function that finds the smallest integer that is greater than or equal to x.

At this time, if Te (i) is set so that <Equation 1> holds even if Te (i) / Tvmin + 1 is substituted for M in <Equation 4>, the VU reproduction time is equal to or longer than Tvmin. In that case, real-time dubbing is possible no matter what playback time the VRU is made of.

By substituting <Expression 3> and <Expression 4> into <Expression 1> and solving with Te (i), the condition Te (i) that can guarantee real-time post-recording Te (i) ≧ 3Ta / ( Rs-Rv-Ra-Rp- (Tk / Tv) x Rs-2Ly / Tv) ... <Formula 5> is obtained.

That is, the lower limit Temin for RU reproduction time for which post-recording can be guaranteed is Temin = 3Ta / (Rs-Rv-Ra-2Rp- (Tk / Tvmin) × Rs-2Ly / Tv) ... <Equation 6> Become.

At this time, the upper limit Temax of the RU reproduction time is set as follows. Temax = Temin + Tvmax ... <Equation 7> Here, Tvmax is the maximum playback time of the VU. The upper limit is set for the following reasons. As Te becomes larger, the period from (2) to (8) in FIG. 8 becomes longer during dubbing. During this time, since the reproduction data cannot be read from the disc, it is necessary to increase the size of the track buffer 502 as Te increases in order to continue reproduction. The upper limit value is set so that the size of the track buffer 502 required at this time can be estimated.

Since there is a margin for the maximum playback time of VU between the lower limit value and the upper limit value, VU of arbitrary playback time is
It is possible to configure RU by the combination of. Although the maximum reproduction time is set here in accordance with the bit rate of the AV stream, it may be constant regardless of the bit rate of the AV stream based on the maximum possible bit rate.

In this embodiment, the continuous recording unit is managed by the reproduction time, but it goes without saying that it may be managed by the recording area size obtained by multiplying the reproduction time by the data bit rate.

In this embodiment, the ECC block including the PRU boundary read at the time of reading the reproduction data is transferred from the track buffer 502 to the post-recording buffer 504 and used at the PRU recording, but it is not transferred but immediately before the PRU recording. The ECC block including the PRU boundary may be read.

In this case, during PRU recording, extra PRU read time and pickup movement time are required.
When the ECC block including the PRU boundary is read immediately before recording for each PRU, Tw (i) in <Equation 1> is calculated as Tw (i) = 2Ta + (M-1) × Tk + M × Tr + Te × Rp / Rs + 2 × (2M-1) × Ly / Rs ・ ・ ・ It can be calculated by <Equation 8>. Note that Tr is the maximum rotation waiting time.

Further, in this embodiment, it is assumed that the division jump and the movement of the pickup to the past RU are performed asynchronously. The reason for this is that compared to the case of performing asynchronously, the condition for performing real-time post-recording is stricter (the period for which the read data is read is interrupted is longer), so real-time post-recording can be performed asynchronously. This is because synchronization is also possible, and the degree of freedom in implementation can be increased.

Therefore, Temin may be set on the premise that the division jump and the movement of the pickup to the past RU are performed in synchronization. In this case, the second term of <Equation 3> should be removed.

Next, a method of determining the arrangement of the non-post-recording compatible stream on the disc will be described. As with the post-recording compatible stream, seamless playback is guaranteed if <Formula 1> is satisfied. However, since post-recording data is not recorded, Twa = 0.

Since Tr (i) is common to <Equation 3>, <
By substituting <Equation 3> and Twa = 0 into Equation 1> and solving with Te (i), Te (i) ≧ Ta / (Rs-Rv-Ra) ... <Equation 9> is obtained.

That is, the RU reproduction time lower limit value Temin for which seamless reproduction can be guaranteed is Temin ≧ Ta / (Rs-Rv-Ra) ... <Equation 10>.

That is, the range of the RU reproduction time differs between the post-recording compatible stream and the non-corresponding stream. This is because when the non-corresponding stream is set in the same range as the corresponding stream, and there is a free continuous area that satisfies <Equation 10> but does not satisfy <Equation 6> on the disc, the non-post-recording stream is recorded. This is because there are no options available.

<Buffer Size> Next, the size of the track buffer 502 necessary for post-recording will be described.
Incidentally, a disturbance such as a shock is not taken into consideration here.
The required size increases as the variation in the timing interval from reproduction data read to PRU recording increases.
For example, if there is a case where the interval of the timing to move to PRU recording is narrow, the data in the track buffer 502 continues to be consumed, and thus the track buffer 502 needs a larger capacity.

Here, the post-recording data recording of RU # N is performed from the completion of the post-recording data recording preparation of the RU # N which is an arbitrary RU to the completion of the post-recording data recording preparation of the next RU, RU # N + 1. Consider the case where the processing ((2) to (8) in FIG. 8) is completed. This width is a value at which after-recording data recording can be started after the reading of the RU currently being read is completed.

Under this condition, it is uncertain at what timing from the completion of the post-recording data recording preparation of a certain RU to the completion of the post-recording data recording preparation of the next RU, the division jump or the post-recording data recording will occur. Therefore, once the after-recording data recording preparation is completed, the after-recording data recording 1 time and the division jump 1 are performed so that the reproduction is not interrupted even if the after-recording data recording 1 time and the division jump 1 occur continuously immediately after the completion of the after-recording data recording preparation. Track buffer 502 must be data that can be played back continuously even if it is performed continuously.
Must be in (condition 1).

It is also conceivable that the post-recording data recording and the division jump may occur immediately before the completion of the post-recording data recording preparation. Even in such a case, in order to satisfy the above-mentioned condition 1, the track buffer 502 has two post-recording data recordings and two divisional jumps consecutively immediately before the post-recording data recording preparation is completed and one post-recording data recording and one divisional jump are performed. Data must be able to be retained so that it can continue playback even if it occurs (condition 2).

That is, the track buffer 502 needs to have a capacity corresponding to the reproduction times of two times of post-recording data recording and two times of division jump. In addition, the playback time Ttmax required to continue playback until the next VU is read, and
Margin Tvmax to secure the required playback time in the track buffer, even with any combination of VUs
The required size Lt of the track buffer 502 including Lt is Lt ≧ (Ttmax + 2 (Twmax + Ta) + Tvmax) × (Rv + Ra + Rp) ... <Formula 11>.

Here, Ttmax = Tvmax × (Rv + Ra + Rp) / Rs, T
wmax = 2Ta + Temax × Tk / Tvmin + (2Temax × Ly) / (Tvmin × R
Substituting s) + Temax × Ra / Rs into <Equation 11>, Lt ≧ (Tvmax × (Rv + Ra + Rp) +2 ((3Ta + (Temax × Tk) / Tvmin) × Rs) + 2Temax × Ly / Tvmin + T emax × Rp) × (Rv + Ra + Rp) / Rs ... <Equation 12> is obtained.

Next, the size of the post-recording buffer 504 required for post-recording will be described. Similarly to the track buffer size, the after-recording buffer 504 is also affected by the variation in the interval of the timing from the reproduction data read to the PRU recording.

Here, similar to the track buffer size trial calculation, from the completion of the post-recording data recording preparation of the RU # N which is an arbitrary RU to the completion of the post-recording data recording preparation of the next RU, RU # N + 1. Consider the case where the post-recording data recording process of RU # N ((2) to (8) in FIG. 8) is completed.

Under this condition, PRU records for up to two RUs may continue. In addition, an RU for storing audio data encoded during PRU recording.
One PRU area is required. Therefore, it is sufficient if there is an area for storing PRU blocks for three RUs.

Therefore, the size L of the post-recording buffer 504
p is Lp ≧ 3 × (Temax × Rp + (2 × (Temax / Tvmin) -1) × Ly) ... <Equation 13>. The second term on the right side is for holding the ECC block including the PRU boundary.

Next, the size of the track buffer 502 required when reproducing the non-post-recording stream will be described. Incidentally, a disturbance such as a shock is not taken into consideration here.

The most necessary track buffer is
This is a case where a split jump occurs during the reading of VU for the reproduction time Tvmax. During this time, new to the track buffer
Since the VU is not read, it is necessary to continue playing with the data in the track buffer.

That is, the reproduction time of Trmax + Ta must exist in the track buffer 502. Where Trm
ax represents the VU read time of the reproduction time Tvmax. The size L of the track buffer 502 required at this time is L ≧ (Trmax + Ta + Tvmax) × (Rv + Ra) + Tvmax × (Rv + Ra) ... <Formula 14>.

The first term on the right side is the amount of data required for reproduction until a new VU is read. Play time Tvmax
Mostly, VU of any play time is track buffer
This is to ensure the necessary playback time in the track buffer 502 even if the data is mixed in 502.

The second term on the right side is an area for holding the VU being read. In addition to this, a margin for intermittent reproduction when the buffer is full is required, but it is omitted here.

Here, Trmax = Tvmax × (Rv + Ra) / Rs is given by <Equation 1
Substituting into 4>, L ≧ (Tvmax × (Rv + Ra + 2Rs) + Ta × Rs) × (Rv + Ra) / Rs ... <Equation 15> is obtained.

<Processing at the time of recording> The process when the user instructs recording will be described with reference to the flowchart of FIG. The AV stream recorded at this time has a video bit rate Rv = 5 Mbps and an audio sampling frequency of 48
Assume that it is an after-recording compatible stream with VU playback time fixed at kHz and bit rate Ra = 256 kbps. It is also assumed that the file system management information has already been read into RAM.

First, the stream structure and the continuous area structure are determined (step 701). If 1 VU is configured with 1 GOP15 frame, Rs = 20Mbps, Ta = in <Formula 6> and <Formula 7>.
1 second, Tk = 0.1 second, Rv = 5Mbps, Ra = Rp = 256kbps, Tvmax = Tvm
Substituting in = about 0.5 seconds, the range of Te (i) is 10.49 seconds or more and 10.99 seconds or less.

It is Te that satisfies this condition at Tvmax = about 0.5 seconds.
(i) = 10.5 seconds, which means that 21 VUs make up an RU. In MPEG-1 audio layer-II, when the sampling frequency is 48 kHz, the playback time per AAU is 0.024.
Since it is seconds, 20 or 21 AAUs can be stored in 1 VU.

When the maximum audio reproducible bit rate is 256 kbps, the maximum size of each AAU is 768b.
It becomes yte. Therefore, the area size of each PRU is secured by the number of AAUs of the corresponding main audio × 768 bytes.

The reason why the PRU area size is fixed is shown below. When recording a post-record compatible stream,
The area size of the PRU must be able to store the same number of AAUs as the number of AAUs included in the corresponding VU.

However, it is difficult to know exactly the number of AAUs included in the corresponding VU before encoding. Because AAU
This is because the period of GOP and GOP is not an integral multiple, and the start timing of audio and video in VU does not always match. Therefore, the PRU area size is the playback time Te (i)
And the maximum number of AAUs included in.

As a result, the overall bit rate increases, but when the audio bit rate Ra is 256 kbps, the maximum is 768 bytes in a few seconds, which may be ignored. Also, A
Data that does not contribute to playback will be included in the V stream, but there is no problem because it can be excluded from playback by using QuickTime management information.

Next, a vacant area in which 21 VUs can be continuously recorded is searched for. Specifically, 21 × Tvmax × (Rv + Ra + Rp), that is, a continuous free area of 57.9 Mbit or more, Space on RAM 102
Search by referring to Bitmap. If it does not exist, stop recording,
Notify the user that recording is not possible (step 702).

Next, the audio encoder 117 and the video encoder 118 are activated respectively (step 703). Also, check whether or not data of 1ECC block (32KB) or more is accumulated in the recording buffer (Step 70
4) During the accumulation, steps 705 to 708 are repeated.

If it has been accumulated, the availability of the ECC block on the disk to be recorded next is checked by referring to the Space Bitmap on the RAM (step 705). If there is no space, 21 V
Find a continuous free area where U can be recorded (step 707),
Move the pickup to the beginning of the empty area (step 7
08), data for one ECC block in the recording buffer 111 is recorded on the disc (step 706).

If no data is stored in the recording buffer 111, it is checked whether or not recording end is instructed (step 709).
To execute.

When the end of recording is instructed, the following steps are executed. First, for the data less than 32KB in the recording buffer, add dummy data to the end.
Make it KB (step 710). Next, the data is recorded on the disc (steps 711 to 714). Finally, RA
The QuickTime management information on the M102 and the file system management information are recorded on the optical disc 106 (steps 715 to 716).

The operations of the audio encoder 117, the video encoder 118 and the multiplexer 113 in parallel with the above processing will be described. Each encoder sends the encoding result to the multiplexer 113, and the multiplexer stores them in the multiplexing buffer 114.

When 1 VU's worth of data, that is, 1 GOP and AAU reproduced in synchronization with it are accumulated in the multiplexing buffer 114, the multiplexer 113 sends 1 VU's of data to the recording buffer 111. At that time, the multiplexer 113 operates as the A in the VU.
Depending on the number of AUs, PRUs capable of storing the maximum bit rate AAUs are multiplexed.

Further, the host CPU 101 is notified that 1 VU worth of data has been encoded, and the host CPU 101 determines the Quic on the RAM 102 based on the number and size of GOPs and AAUs constituting the VU.
Update kTime management information.

Here, the reproduction time included in the RU is determined based on the performance (Rs, Ta, Tk) of the reference device so that any device can post-record the recorded stream. This may be determined based on the performance of the recording device. In that case, the X descriptor in the QuickTime management information can be used so that the device that performs post-recording can determine whether it is possible to post-record the AV stream.
Performance is stored in set performance atom of atom.

<Processing at Post-Recording> The process when the user instructs the post-recording will be described with reference to the flowchart of FIG. Here, it is assumed that the QuickTime management information regarding the AV stream to be post-recorded has already been read into the RAM 102.

First, it is checked whether or not the QuickTime movie is composed of a dubbing-compatible stream of only one file, and if not, the user is notified that dubbing is not possible (step 801). This is because there is no guarantee that the non-destructive editing of the streams recorded on the disc independently satisfies the above-mentioned post-recording condition.

The reproduction data is read from the beginning of the VU on the disc including the post-recording start position (step 80).
2). At this time, step 802 is repeated until data for a sufficient reproduction time is read (step 803). Here, the data for a sufficient reproduction time means a data amount that does not interrupt the reproduction even when the reproduction data read interruption period is the maximum.

When the PRU is read, the PRU is included.
The ECC block is sent to the after-recording buffer 111. At this time, in order to manage the PRU in the post-recording buffer 111,
Playback start time of each PRU in the post-recording buffer 111 (relative time from the beginning of the AV stream) and post-recording buffer 1
The set of addresses in 11 is held in the RAM 102 as a table.

Next, the video decoder 116, the audio decoder 115, and the audio encoder 117 are activated.
(Step 804). The audio encoder 117 encodes the sampled voice waveform into an AAU and sends it to the multiplexer 113 at the AAU cycle. At that time, the relative time from the beginning of the AV stream is added to each AAU.

The multiplexer 113 stores the AAU in the PRU in the after-recording buffer 111 based on the time added to the AAU. When the AAU is completely stored in the last PRU in the RU, the host CPU 101 is notified of the RU encoding end.

Next, it is checked whether or not the user has instructed the end of dubbing (step 805). If not, step 8 until PRU encoding is complete.
The reproduction data is read out in the same manner as 02 (step 80).
9).

When the RU encoding end is notified from the multiplexer unit (step 806), from the playback start time of the PRU included in the RU held in the table on the RAM 102, Q
Using the uickTime management information, the address on the optical disc 106 where the PRU should be recorded, that is, the address where the PRU was originally recorded is obtained. Pick up at that address 107
Is moved (step 807), and the ECC block including the PRU is recorded on the optical disc 107 (step 808).

If the end of dubbing is instructed, wait for the completion of encoding of the PRU currently being encoded (step 81
0), the pickup address is obtained for the recording address of the PRU (step 811), and the PRU is recorded (step 812). Finally, record the QuickTime management information on the disc (step 81
3).

In this embodiment, when the reading of the reproduction data is interrupted and the recording of the PRU is started, the occupancy of the reproduction buffer 110 is not checked, but a shock to the after-recording may occur. It goes without saying that it is better to check to improve resistance. However, in this case, since the PRU recording timing is delayed, more capacity of the reproduction buffer 110 and the post-recording buffer 111 is required.

<Processing at the time of reproduction> The processing when the reproduction is instructed by the user will be described with reference to the flowchart of FIG. Here, it is assumed that the QuickTime management information regarding the AV stream to be reproduced has already been read into the RAM 102.

The reproduction data is read from the beginning of the VU for which reproduction is instructed on the optical disc 107 (step 901).
At this time, step 901 is repeated until data for a sufficient reproduction time is read (step 902).

Here, the data for a sufficient reproduction time is
It means the amount of data that does not interrupt the reproduction even when the reproduction data read interruption period is the maximum. Specifically, the split jump (up to 1
(2 seconds) is assumed, and the data amount is 1 second.

Next, the video decoder 116 and the audio decoder 115 are activated (step 903). Further, it is checked whether or not the user has instructed to end the reproduction (step 904). If not instructed, reproduction AV data is read (step 905). If the end of reproduction is instructed, the process ends.

<Second Embodiment> Next, the second embodiment of the present invention will be described.
An example will be described. The difference from the above-described first embodiment is that the first embodiment rewrites only the PRU, whereas this embodiment rewrites the entire RU. Since this embodiment is similar to the first embodiment, only the differences will be described below. The symbols not newly defined use the definitions in the first embodiment.

<Form of AV Stream> In this embodiment
Since the structure of the AV stream is exactly the same as that of the first embodiment described above, the description is omitted.

<Disc Arrangement Determining Method> The RU reproducing time determining method for the non-post-recording stream is the same as that of the first embodiment.

[0175] Next, the RU in the post-recording compatible stream
A method of determining the reproduction time will be described. In this determination method, as in the first embodiment, in order to ensure compatibility between devices,
Reference device model and reference
Assuming post-recording algorithms, RU is used so that seamless playback does not break when post-recording is performed using them.
Determine the playback time.

The reference device model has the same configuration as that of the first embodiment described above with reference to FIG. However, in the first embodiment, what is transferred from the track buffer 502 to the post-recording buffer 504 is
In the second embodiment, the entire RU is transferred, as opposed to only the ECC block containing the PRU. When recording the post-record data on the disc, not only the ECC block including the PRU but also the entire RU is recorded.

Next, the reference dubbing algorithm will be described with reference to FIG. The numbers (1) to (5) in FIG. 12 are the numbers (1) to (5) in the following description.
Corresponding to the numbers up to. The outline of the algorithm is as follows.

(1) Read the reproduction data. (2)
At the same time when the encoding of the audio data corresponding to the Nth RU, RU # N, is completed, the RU # N is accessed. (3) RU # N is recorded in the data in the after-recording buffer 504. (4) Return to the original read position. (5) Restart the reading of the reproduction data. The above operation is repeated.

In the reference device model, when post-recording is performed using the reference post-recording algorithm, as in the first embodiment,
By satisfying 1>, it can be guaranteed that the post-recording buffer 504 does not overflow and the track buffer 502 does not underflow.

In the second embodiment, Tr in <Equation 1>
(i) is common with <Equation 3>. Tw (i) in <Equation 1> is Tw (i) = 2Ta + Te (i) × (Rv + Ra + Rp) / Rs ... <Equation 16> where the first term on the right side is RU Indicates the round-trip access time to #i. The third term on the right side represents the time for recording RU # i on the disc. Since the RU is composed of an integer number of ECC blocks, the term like the fourth term on the right side of <Equation 4> is unnecessary.

By substituting <Expression 3> and <Expression 16> into <Expression 1> and solving with Te (i), the condition of Te (i) that can guarantee real-time post-recording Te (i) ≧ 3Ta / ( Rs-2 (Rv + Ra + Rp)) ... <Formula 17> is obtained.

That is, the lower limit Temin for the RU reproduction time for which post-recording can be guaranteed is Temin = 3Ta / (Rs-2 (Rv + Ra + Rp)) ... <Equation 18>.

At this time, the upper limit Temax of the RU reproduction time is set as follows. Temax = Temin + Tvmax ... <Formula 19> The reason why the upper limit value is set for the RU regeneration time is the same as the reason described in the first embodiment. Further, as described in the first embodiment, the maximum reproduction time may be set to be constant based on the maximum possible bit rate regardless of the bit rate of the AV stream.

In the present embodiment, the continuous recording unit is managed by the reproduction time, but it goes without saying that it may be managed by the recording area size obtained by multiplying the reproduction time by the data bit rate.

Further, in the present embodiment, it is assumed that the division jump and the movement of the pickup to the past RU are performed asynchronously, but it is assumed that they are performed in synchronization as in the first embodiment. , Temin may be set.

<Track Buffer Size> Next, the size of the track buffer 502 required for post-recording will be described. Incidentally, a disturbance such as a shock is not taken into consideration here. Similar to the first embodiment, the required size increases as the variation in the timing interval from reading the reproduction data to PRU recording increases.

Here, as in the first embodiment, any RU
RU # N is ready for recording post-recording data
RU # N + 1 after-recording data recording preparation is completed (RU # N after-recording data recording process ((2) to FIG. 12).
Consider the case where (4)) is completed. Incidentally, the post-recording data recording here means recording of the entire RU unlike the first embodiment.

For the same reason as the explanation given in the first embodiment, the track buffer 502 required in this case has a capacity corresponding to the reproduction time of two post-recording data recordings and two reproduction times of the divided jump. Becomes That is, the required track buffer 502 size Lt
Is expressed by <Equation 11>.

Here, Ttmax = Tvmax × (Rv + Ra + Rp) / Rs, T
Substituting wmax = 2Ta + Temax × (Rv + Ra + Rp) / Rs into <Equation 11>, L ≧ ((2Temax + Tvmax) × (Rv + Ra + Rp) + (Tvmax + 6Ta) × Rs) × (Rv + Ra + Rp) / Rs ... <Equation 20> is obtained.

Next, the size of the post-recording buffer 504 required for post-recording will be described. For the reason explained in the first embodiment, the post-recording buffer 504
The size of 3 RU is required. Therefore, the size Lp of the post-recording buffer 504 is Lp ≧ 3 × Temax × (Rv + Ra + Rp) ... <Formula 21>.

Processing at the time of recording and reproducing is the same as that of the first embodiment, and therefore its explanation is omitted. The post-recording process differs from that of the first embodiment in the following points. First, in step 803, in the first embodiment, the data is transferred from the reproduction buffer 110 to the post-recording buffer 111 only when the PRU is read, but in the present embodiment, all the read data is transferred. To do.

Next, in step 808, only the ECC block including PRU is recorded on the disc in the first embodiment, but in this embodiment, recording is performed for all VUs to be post-recorded.

It should be noted that although the present embodiment and the first embodiment are used properly, the RU regeneration lower limit value obtained by <Equation 17> and the RU regeneration lower limit value obtained by <Equation 9> are calculated in the system to be implemented. However, the one with the smaller RU regeneration lower limit may be adopted. This is because the shorter the RU, the more difficult it is to place restrictions on placement.

<Third Embodiment> In the first and second embodiments described above, it is premised that the AV stream is dispersedly recorded on the disc in units of RU, but the device has a long pickup movement time. In the above, there are cases where post-recording cannot be performed by these methods.

In the third embodiment of the present invention, in such a case, only the AV stream corresponding to the post-recording is arranged continuously on the disc to reduce the maximum pickup moving time. This enables post-recording even with a device that has a long pickup moving time.

The form of the AV stream is the same as that of the first embodiment described above. However, as for the post-recording AV stream, one AV stream is composed of one RU.

<Processing at Recording> Recording of an after-recording compatible AV stream is performed by the same method as in the first embodiment. However, in the first embodiment, when recording of the continuously recordable empty area is completed, the recording is moved to the next empty area and recording is continued, whereas in the present embodiment, the continuously recordable empty area is recorded. The difference is that the recording is ended when the first recording of is ended.

<Processing at Post-Recording> The post-recording processing is performed in the same procedure as in the first embodiment. However, since there is no unit called RU, the timing to start recording dubbing data is determined by one of the following methods.

First, the first method will be described. First
The method of 1 is based on the premise that only the ECC block including PRU is recorded, as in the first embodiment, and Te obtained by
It is to start post-recording data recording at intervals of min.

However, in the first embodiment, Ta is the maximum time for stopping reading and recording from the disk, but in the present embodiment, seek time of several tens to several hundred tracks and waiting for rotation. It will be a combination of time.

Next, the second method will be described. Second
Like the second embodiment, the method (2) is based on the premise that the main audio and video data other than the after-recording audio are also rewritten, and the after-recording data recording is started at the Temin interval obtained by <Equation 13>.

However, in the second embodiment, Ta is the maximum time for stopping reading and recording from the disk, but in the present embodiment, seek time of several tens to several hundred tracks and waiting for rotation. It will be a combination of time.

<Fourth Embodiment> In the first to third embodiments described above, it is premised that the audio data is recorded on the disc in parallel with the audio input at the time of after-recording, but the device has a long pickup moving time. In the case of, it is difficult to perform such control. The fourth embodiment of the present invention assumes such a case.

The form of the AV stream is the same as that of the first embodiment described above. Also, the playback time per RU is determined based on <Equation 10> for the post-recording compatible stream, as with the non-post-recording compatible stream. Since the processing at the time of recording and reproduction is the same as that of the first embodiment, it will be omitted.

<Processing at Post-Recording> The process when the user instructs post-recording will be described with reference to the flowchart of FIG. Here, it is assumed that the QuickTime management information regarding the AV stream to be post-recorded has already been read into the RAM 102.

First, the reproduction data is read from the beginning of the VU on the disc including the post-recording start position (step 1301). At this time, step 1301 is repeated until data for a sufficient reproduction time is read (step 1302). Here, the data for a sufficient reproduction time means a data amount that does not cause the reproduction to be interrupted even when the reproduction data read interruption period is the maximum.

When the PRU is read, the PRU is included.
The ECC block (PRU block) is sent to the post-recording buffer 111. At this time, in order to manage the PRU in the after-recording buffer 111, a set of the playback start time (relative time from the beginning of the AV stream) of each PRU in the after-recording buffer 111 and the address in the after-recording buffer 111 is set. RAM as a table
Hold at 102.

Next, the video decoder 116, the audio decoder 115, and the audio encoder 117 are activated.
(Step 1303). The audio encoder 117 encodes the sampled voice waveform into an AAU and sends it to the multiplexer 113 at the AAU cycle.

[0209] At this time, the relative time from the beginning of the AV stream is added to each AAU. Multiplexer 113
Stores the AAU in the PRU block in the post-recording buffer 111 based on the time added to the AAU.

Next, it is checked whether or not the user has instructed the end of dubbing (step 1304). Step 1 until PRU encoding is complete, unless otherwise indicated
Similar to 301, read the playback data (step
1305). If the end of dubbing is instructed, the following processing is performed as long as there is an unrecorded PRU block in the dubbing buffer 111 (step 1306).

First, from the playback start time of the PRU held in the table on the RAM 102, the address on the optical disk 106 at which the PRU block should be recorded using the QuickTime management information, that is, the PRU block was originally recorded. Ask for an address.

Next, the pickup 107 is moved to the address (step 1307), and the ECC block including the PRU is recorded on the optical disc 107 (step 1308). Unrecorded PRU
When there are no more blocks, the QuickTime management information is finally recorded on the disc (step 1309).

In the above dubbing process, all
Although the PRU is recorded after the post-recording, it is possible to reduce the waiting time after the post-recording by recording the PRU that can be recorded during the post-recording. Such processing will be described with reference to the flowchart of FIG. Here, regarding the AV stream already targeted for post-recording
It is assumed that the QuickTime management information is loaded in the RAM 102.

First, the reproduction data is read from the beginning of the VU on the disc including the post-recording start position (step 1401). At this time, step 1401 is repeated until data for a sufficient reproduction time is read (step 1402). Here, the data for a sufficient reproduction time means a data amount that does not cause the reproduction to be interrupted even when the reproduction data read interruption period is the maximum.

When the PRU is read, the PRU is included.
The ECC block (PRU block) is sent to the post-recording buffer 111. At this time, in order to manage the PRU in the after-recording buffer 111, a set of the playback start time (relative time from the beginning of the AV stream) of each PRU in the after-recording buffer 111 and the address in the after-recording buffer 111 is set. RAM as a table
Hold at 102.

Next, the video decoder 116, the audio decoder 115, and the audio encoder 117 are activated.
(Step 1403). The audio encoder 117 encodes the sampled voice waveform into an AAU and sends it to the multiplexer 113 at the AAU cycle. At that time, AV for each AAU
Add the relative time from the beginning of the stream.

The multiplexer 113 stores the AAU in the PRU block in the after-recording buffer 111 based on the time added to the AAU. When the AAU is completely stored in the last PRU in the RU, the host CPU 101 is notified of the RU encoding end.

[0218] Next, it is checked whether the user has instructed the end of dubbing (step 1404). Step 1 until PRU encoding is complete, unless otherwise indicated
Playback data is read in the same way as 301 (step 14
09).

When the PRU encoding end is notified from the multiplexer section (step 1405), it is judged whether or not the PRU can be recorded (step 1406). Specifically, the time required for PRU recording is calculated from the current position of the pickup and its PRU, and compared with the current playback buffer remaining amount, and the playback buffer becomes empty or empty depending on the PRU recording. If it does not come close, it is judged that recording is possible.

When it is judged that the PRU is recordable, from the playback start time of the PRU contained in the RU held in the table on the RAM 102, the address on the optical disc 106 where the PRU should be recorded using the QuickTime management information, that is, Find the address where the PRU was originally recorded. Move the pickup 107 to that address (step 1407) and add the EC containing that PRU.
The C block is recorded on the optical disc 107 (step 1408).

If the post-recording end is instructed, as long as there is an unrecorded PRU block in the post-recording buffer 111.
(Step 1410), the following processing is performed. First, from the playback start time of the PRU stored in the table on RAM102,
Using the uickTime management information, the address on the optical disc 106 where the PRU block should be recorded, that is, the address where the PRU block was originally recorded is obtained.

Next, the pickup 107 is moved to the address (step 1411), and the ECC block including the PRU is recorded on the optical disc 107 (step 1412). Unrecorded PRU
When there are no more blocks, the QuickTime management information is finally recorded on the disc (step 1413).

<Fifth Embodiment> In the first to third embodiments described above, the audio data input at the time of post-recording is directly recorded in the corresponding PRU. It may be difficult to perform proper control. In the fifth embodiment of the present invention, assuming such a case, recording is performed in a temporary area on the disc at the time of post-recording, and the data is moved to the original PRU after the post-recording.

The form of the AV stream is the same as that of the first embodiment described above. In addition, the playback time per RU is determined based on <Equation 10> for the post-recording compatible stream, as with the non-post-recording compatible stream. Since the processing at the time of recording and reproduction is the same as that of the first embodiment, it will be omitted.

<Processing for Post-Recording> The process when the user instructs post-recording will be described with reference to the flowchart of FIG. Here, it is assumed that the QuickTime management information regarding the AV stream to be post-recorded has already been read into the RAM 102.

First, the reproduction data is read from the beginning of the VU on the disc including the post-recording start position (step 1501). At this time, step 1501 is repeated until data for a sufficient reproduction time is read (step 1502). Here, the data for a sufficient reproduction time means a data amount that does not cause the reproduction to be interrupted even when the reproduction data read interruption period is the maximum.

Also, when the PRU is read, it contains the PRU.
The ECC block (PRU block) is sent to the post-recording buffer 111. At this time, in order to manage the PRU in the after-recording buffer 111, a set of the playback start time (relative time from the beginning of the AV stream) of each PRU in the after-recording buffer 111 and the address in the after-recording buffer 111 is set. RAM as a table
Hold at 102.

Next, the video decoder 116, the audio decoder 115, and the audio encoder 117 are activated.
(Step 1503). The audio encoder 117 encodes the sampled voice waveform into an AAU and sends it to the multiplexer 113 at the AAU cycle. At that time, AV for each AAU
Add the relative time from the beginning of the stream.

The multiplexer 113 stores the AAU in the PRU block in the after-recording buffer 111 based on the time added to the AAU. The multiplexer 113 sends the AAU to the PRU in the post-recording buffer 111 based on the time added to the AAU.
To store.

Next, it is checked whether or not the user has instructed the end of dubbing (step 1504). If not, move pickup 107 to the next VU (step
1505), as in step 802, the reproduction data is read (step 1506).

When the PRU block currently in the after-recording buffer 111 is the Nth or later after the start of the after-recording (step 1507), the pickup 107 is moved to the head of the VU read immediately before (step 1508), and the after-recording is performed. Temporarily record the oldest PRU block in buffer 111 (step 15
09).

At this time, which PRU was temporarily recorded and where is recorded in the RAM 102. It should be noted that the above-mentioned N is determined based on the maximum time that the post-recording data for the reproduction data can be recorded after the reproduction data is read.

If the end of the post-recording is instructed, the following processing is performed as long as the temporarily recorded PRU remains (step 1510). First, the pickup 107 is moved to the temporarily recorded PRU position (step 1511), the PRU block is read (step 1512), and the pickup 107 is moved to the PRU position where the PRU should be originally recorded (step 1513). , PRU block is recorded (step 1514).

Note that although reading and writing are performed for each PRU here, it goes without saying that reading and recording may be performed continuously for a plurality of PRUs.

After the temporarily recorded PRU has been moved to the original location, next processing is performed as long as the PRU block remains in the after-recording buffer 111 (step 1515). From the playback start time of the PRU added to the PRU block, find the address originally recorded for that PRU block using QuickTime management information, move the pickup 107 to that address (step 1516), and record that PRU block. Yes (step 1517). When there are no unrecorded PRU blocks, the QuickTime management information is finally recorded on the disc (step 1518).

In this embodiment, another area in the same stream is used as an area for temporarily recording the PRU block in consideration of the case where there is no free area on the disk. Obviously, it may be outside the same stream as long as it is in the vicinity.

Further, in the present embodiment, a semiconductor memory such as a post-recording buffer or an optical disk is used as a medium for temporarily recording the PRU block, but other recording medium such as a hard disk may be used. Needless to say

<Sixth Embodiment> Next, the sixth embodiment of the present invention will be described.
The embodiment will be described with reference to FIG.

<AV Stream Form> First, the structure of the AV stream in this embodiment will be described with reference to FIG. The AV stream includes a post-recording compatible stream and a non-post-recording compatible stream. The non-post-recording stream is composed of a unit in which video and audio for about 1 second are multiplexed. Here, that unit is called a Video Unit (VU).

[0240] Here, regarding the structure of the VU, in the after-recording non-compliant stream in the above-mentioned first embodiment.
The description is omitted because it is the same as VU.

On the other hand, the post-recording compatible stream is shown in FIG.
As shown in, the Po which is an area for storing the post-recording data for each integer number of VUs for the non-post-recording stream.
A st Recording Unit (PRU) is multiplexed. PRU
In this field, audio data for post-recording that is played back at the same time as the VU up to the next PRU is stored.

The PRU is located before the corresponding VU,
In other words, the relative block number in the file is small,
This is because the delay buffer for synchronously reproducing the AV data in the VU and the post-recording audio data in the PRU can be small.

Here, the PRU to be reproduced synchronously and an integer number of Vs
Together with U, it is called Editable Unit (EU). The interval at which PRUs are multiplexed is related to the possibility of post-recording, and the method for determining the multiplexing interval will be described later.

[0244] The EU (including the EU head, but excluding the AV stream head) is divided at most once, and the PRU is continuously recorded on the disc. by this,
The lower limit of EU reproduction time can be lowered as described later.

For the method of determining the area size of PRU,
The description is omitted because it is common to the first embodiment.

<Disc Arrangement Determining Method> Next, a method of determining an interval for multiplexing PRUs in the post-recording compatible stream will be described. In this determination method, as in the first embodiment, a reference device (reference device model) and a reference post-recording algorithm (reference post-recording algorithm) are assumed, and then post-recording is performed using them. The multiplexing interval is determined so that seamless reproduction does not fail when performing.

Here, the reference device model is the same as that of the first embodiment, and therefore its explanation is omitted.

Next, the reference dubbing algorithm will be described with reference to FIG. Note that the numbers (1) to (11) in FIG. 17 are the same as (1) to (1) in the following description.
It corresponds to the numbers up to 1). The outline of the algorithm is as follows.

(1) Read the reproduction data. (2)
At the same time as the encoding of the audio data corresponding to the Nth PRU, PRU (N), is completed, the PRU (N) is accessed. (3) Record PRU (N) on the disc. (4) Return to the original read position.

(5) Read the reproduction data. (6)
At the same time as the encoding of the audio data corresponding to PRU (N + 1) which is the N + 1th PRU is completed, the PRU (N + 1) is accessed. (7) Record PRU (N + 1) on the disc.
(8) Return to the original read position. (9) Read the playback data. (10) If the playback data has a break point, seek to the beginning of the next continuous area. (11) Restart the reading of the reproduction data. The above operation is repeated.

In the reference device model, when post-recording is performed using the reference post-recording algorithm, there is no overflow of the post-recording buffer 504 and no underflow of the track buffer 502 if the following conditions are satisfied. Can be guaranteed.

[0252] The condition is any EU in the AV stream.
For EU # i, the maximum playback time is Te (i), the maximum read time including split jump is Tr (i), and the maximum recording time of PRU # i, which is a PRU in EU # i, is Tw (i). Then, as in the first embodiment, <Formula 1> is satisfied.

At this time, since the post-recording data is recorded on the disk in synchronization with the completion of PRU encoding,
The data in the after-recording buffer 504 does not accumulate, and the after-recording buffer 504 does not overflow.

Tr (i) in <Expression 1> is Tr (i) = Te (i) × (Rv + Ra) / Rs + Te (i) × Rp / Rs + Ta ・ ・ ・ <Formula 22> Becomes

The first term and the second term on the right side represent the VU read time and the PRU read time in EU, respectively. The third term on the right-hand side represents the access time due to the split jump associated with reading.
Since there is a maximum of one division in the EU, the access time is one time.

In addition, Tw (i) is Tw (i) = 2Ta + Te (i) × Rp / Rs + Ty ・ ・ ・ <Formula 23> Becomes

Here, the first term on the right side indicates the round-trip access time to the PRU. The maximum access time Ta is used as the round-trip access time to the PRU for the same reason as in the first embodiment.

The second term on the right side represents the time for recording the PRU on the disc. Ty, which is the third term on the right side, represents the maximum recording time other than the post-recording data in the ECC block including both ends of the PRU, and Ty = 2 × 32 KB / Rs. The reason why such a term is necessary is that both ends of the PRU do not necessarily coincide with the ECC block boundary, and therefore, at the time of PRU recording, a maximum of 2 ECC blocks larger than the size of the PRU is recorded.

Since PRUs are continuously recorded on the disc as described above, no access occurs during PRU recording. As a result, the time required for PRU recording can be shortened, and as a result, it becomes possible to keep the lower limit of the EU playback time low.

Substituting <Expression 22> and <Expression 23> into <Expression 1>, T
The condition of Te (i) that can guarantee post-recording when solved by e (i) Te (i) ≧ ((3Ta + Ty) × Rs) / (Rs-Rv-Ra-2Rp) ・ ・ ・ <Equation 24> Is obtained.

That is, the EU reproduction time lower limit value Temin for which post-recording can be guaranteed is Temin = ((3Ta + Ty) × Rs) / (Rs-Rv-Ra-2Rp) ... <Equation 25>.

At this time, the upper limit Temax of the EU reproduction time is set as follows. Temax = (3Ta × Rs) / (Rs-Rv-Ra-2Rp) + Tvmax ... <Equation 26> Here, Tvmax is the maximum reproduction time of VU. The upper limit is set based on the reason explained in the first embodiment. Also, if the EU playback time satisfies the above restrictions, the VU playback time in the stream may be fixed or variable.

Further, in the present embodiment, the number of divisions in the EU (including the EU head) is set to a maximum of 1, but any number N may be set. As a result, the continuous region length can be relatively shortened, which has the advantage of increasing the degree of freedom of arrangement. However, it is necessary to change so that Ta in the third term on the right side of <Equation 3> is multiplied by N.

Further, in the present embodiment, the number of divisions in the EU (including the EU head) is set to a maximum of 1, but each continuous area forming the AV stream must be at least once in the EU, that is, the PRU. May be restricted to include. Alternatively, each contiguous region may be restricted to always contain the complete EU.

When the VU playback time is fixed in the stream, the VU playback time may be limited by the minimum number of VUs included in each continuous area. Alternatively, the EU playback time in the stream is a fixed value Te
In the case of, the continuous region length may be limited to M × Te × (Rv + 2Ra) or more. In addition, M is an integer of 1 or more.

Further, although the EU reproduction time is set in this embodiment, when the division position is limited to the beginning of the EU, the reproduction time of the continuous area is set, and the first reproduction time is set. It can be considered as one variation in which the AV stream configuration is different from that in the embodiment.

<Buffer Size> Next, the size of the track buffer 502 necessary for post-recording will be described.
The idea is the same as that in the first embodiment, but Ttmax and Twmax in <Equation 11> are respectively different due to the difference in AV stream configuration.
Ttmax = Temax × Rp / Rs + Tvmax × (Rv + Ra) / Rs, Twmax = 2Ta + Ty
+ Temax × Rp / Rs, and the required track buffer size L
t becomes Lt ≧ (3Temax × Rp + Tvmax × (Rv + Ra) + (6Ta + 2Ty + Tvmax) × Rs) × (Rv + Ra + Rp) / Rs ... <Equation 27>.

In this embodiment, for the reason described in the first embodiment, it is assumed that the split jump and the movement of the pickup to the past RU are performed asynchronously. Temin may be set on the assumption that the pickup is moved to the RU in synchronization. In this case, the third term on the right side of <Equation 22> should be removed.
Regarding the track buffer size, the Ta term in <Equation 11> may be removed.

Further, in the present embodiment, only the ECC block including the PRU is recorded as the reference after-recording algorithm. However, as in the second embodiment, the reference recording for re-recording the entire AV stream is performed. An after-recording algorithm may be used. In that case, <Expression 23>
The second term on the right side of is Te (i) × (Rv + Ra + Rp) / Rs. For track buffer size, Twmax in <Equation 11> is 2Ta + T
It may be y + Temax × (Rv + Ra + Rp) / Rs.

<Processing at the time of recording> Next, the process when the user instructs recording will be described. The processing flow is first
Since it is the same as the embodiment of FIG. The AV stream recorded at this time is the bit rate of the video.
Rv = 5Mbps, audio bit rate Ra = 256kbps, VU
It is assumed that the stream is an after-recording compatible stream having a fixed reproduction time.
It is also assumed that the file system management information has already been read into RAM.

First, the stream structure and continuous region structure are determined (step 701). If 1 VU is composed of 1 GOP 15 frames, Rs = 20Mbps, Ta = in <Formula 25> and <Formula 26>.
Substituting 1 second, Rv = 5Mbps, Ra = 256kbps, Tvmax = about 0.5 seconds, the range of Te (i) from 4.22 seconds to 4.72 seconds can be obtained. Tvm
This condition is satisfied at ax = approximately 0.5 seconds when Te (i) = 4.5 seconds, and a PRU is inserted every 9 VUs.

In the MPEG-1 audio layer-II, when the bit rate is 256 kbps, the AAU playback time Taf is 0.024 seconds and the size is 768 bytes. At this time, the PRU area size is
It becomes 144384 bytes. In addition, the continuous area should include 9 VUs.

A vacant area in which 9 VUs and 1 PRU can be continuously recorded is searched for. Specifically, 9 × Tvmax × (Ra + Rv) + 9 × T
vmax × Ra, that is, RA for continuous free space of 24.8 Mbit or more
Search by referring to the Space Bitmap on M102. If it does not exist, stop recording and inform user that recording is not possible
(Step 702).

Next, the audio encoder 117 and the video encoder 118 are activated (step 703). Also, check whether or not data of 1ECC block (32KB) or more is accumulated in the recording buffer (Step 70
4) Steps 705 to 708 are repeated while being accumulated.

If it has been accumulated, the availability of the ECC block on the disk to be recorded next is checked by referring to the Space Bitmap on the RAM (step 705). 9 VUs if there is no space
Search for continuous free space where
707), the pickup is moved to the beginning of the empty area (step 708), and the data for one ECC block in the recording buffer 111 is recorded on the disc (step 706).

On the other hand, if no data is stored in the recording buffer 111, it is checked whether or not recording end is instructed (step 709), and if recording is not ended, step 704 is executed.

If the end of recording is instructed, the following steps are executed. First, for the data less than 32KB in the recording buffer, add dummy data to the end.
Make it KB (step 710). Next, the data is recorded on the disc (steps 711 to 714). Furthermore, RA
The QuickTime management information on the M102 and the file system management information are recorded on the optical disc 106 (steps 715 to 716).

The operations of the audio encoder 117, the video encoder 118 and the multiplexer 113 in parallel with the above processing will be described. Each encoder sends the encoding result to the multiplexer 113, and the multiplexer stores them in the multiplexing buffer 114.

When 1 VU's worth of data, that is, 1 GOP and AAU reproduced in synchronization with it, are accumulated in the multiplexing buffer 114, the multiplexer 113 sends 1 VU's of data to the recording buffer 111. At this time, if the VU is the 9 × i-th (i is an integer of 0 or more) VU, the PRU having the above-mentioned size is sent to the recording buffer 111 first.

Furthermore, the host CPU 101 is notified that 1 VU worth of data has been encoded, and the host CPU 101 determines the Qu on the RAM 102 based on the number and size of GOPs and AAUs that compose the VU.
Update ickTime management information.

<Processing at Post-Recording> Next, the process when the user instructs post-recording will be described. Since the processing flow is the same as that of the first embodiment, it will be described with reference to FIG. Here, it is assumed that the QuickTime management information regarding the AV stream to be post-recorded has already been read into the RAM 102.

First, it is checked whether or not the QuickTime movie is made up of an after-recording compatible stream of only one file, and if not, the user is notified that the after-recording cannot be performed (step 801). This is because there is no guarantee that the non-destructive editing of streams recorded on a disc independently satisfies the above-mentioned conditions for post-recording.

PRU on disk including post-recording start position
Playback data is read from the beginning of the
2). At this time, step 802 is repeated until data for a sufficient reproduction time is read (step 803).

[0284] Here, the data for a sufficient reproduction time is
This means the amount of data that does not interrupt the reproduction even when the reproduction data read interruption period is the maximum. In particular,
Assuming that PRU recording (worst time about 3 seconds) and split jump (worst 1 second) accompanying AV data reading are performed continuously,
The amount of data for seconds.

When the PRU is read, the PRU is included.
The ECC block is sent to the after-recording buffer 111. At this time, in order to manage the PRU in the post-recording buffer 111,
Playback start time of each PRU in the post-recording buffer 111 (relative time from the beginning of the AV stream) and post-recording buffer 1
The set of addresses in 11 is held in the RAM 102 as a table.

Next, the video decoder 116, the audio decoder 115, and the audio encoder 117 are activated.
(Step 804). The audio encoder 117 encodes the sampled voice waveform into an AAU and sends it to the multiplexer 113 at the AAU cycle. At that time, the relative time from the beginning of the AV stream is added to each AAU.

The multiplexer 113 stores the AAU in the PRU in the after-recording buffer 111 based on the time added to the AAU. When the AAU is completely stored in the PRU, the host
The CPU 101 is notified of the end of PRU encoding. Next, check if the user has instructed the end of dubbing.
(Step 805). If not instructed, the reproduction data is read as in step 802 until the PRU encoding is completed (step 809).

[0288] When encoding of a PRU in the post-recording buffer 111 is completed (step 806), from the playback start time of the PRU held in the table on the RAM 102, the QuickTi
Optical disc 106 whose PRU should be recorded using me management information
Find the address above, that is, the address where the PRU was originally recorded. The pickup 107 is moved to the address (step 807), and the ECC block including the PRU is recorded on the optical disc 107 (step 808).

On the other hand, if the end of dubbing is instructed,
Waiting for the encoding of the PRU currently being encoded to be completed (step 810), the pickup is moved for the recording address of the PRU (step 811), and the PRU is recorded (step 81).
2). Finally, record the QuickTime management information on the disc
(Step 813).

<Processing at the time of reproduction> Next, the process when the user gives an instruction for reproduction will be described. The processing flow is first
Since it is the same as the embodiment of FIG.
Here, regarding the AV stream that is already the target of playback
It is assumed that the QuickTime management information is loaded in the RAM 102.

Data for reproduction is read from the head of the PRU on the optical disc 107 including the post-recording start position (step 901). At this time, step 901 is repeated until data for a sufficient reproduction time is read (step 902).

Here, the data for a sufficient reproduction time is
This means the amount of data that does not interrupt the reproduction even when the reproduction data read interruption period is the maximum. In particular,
The amount of data for one second is assumed, assuming a case where a split jump (maximum one second) accompanying the reading of AV data is performed.

Next, the video decoder 116 and the audio decoder 115 are activated (step 903). Further, it is checked whether or not the user has instructed to end the reproduction (step 904). If not instructed, reproduction AV data is read (step 905). If the end of reproduction is instructed, the process ends.

<Seventh Embodiment> Next, the seventh embodiment of the present invention will be described.
The embodiment will be described with reference to FIGS. 18 to 20. The difference between the first to sixth embodiments and the seventh embodiment is that the area for storing the post-record data is not multiplexed with the AV stream. In addition, recording sub audio data,
The difference is that not only is it performed while playing the video data and main audio data, but it is also assumed to be performed independently. Specifically, it is different in that the separately recorded BGM data is considered to be reproduced synchronously with the video data and the main audio data by nondestructive editing.

<AV Stream Form> In this embodiment
The structure of the AV stream will be described. The AV stream includes a stream in which audio and video are multiplexed (AV multiplexed stream) and a stream composed of only audio data (audio stream). The structure of the AV multiplexed stream is the same as that of the non-post-recording compatible stream in the above-described first embodiment, and a description thereof will be omitted here.

[0296] The audio stream stores post-recording audio data, and is composed of an integer number of AAUs. AV
The multiplexed stream and the audio stream are stored in separate files, but they may be stored in the same file. If the dividing position is limited to the beginning of the VU, the continuous area here is equivalent to the above-mentioned RU.

<Disc Arrangement Determination Method> Next, the above-mentioned AV
A method of determining the configuration of each continuous area when the stream is distributed and arranged in a plurality of continuous areas on the disc will be described. In the first, second, and fifth embodiments, the structure of the continuous area is determined so that the reproduction is not interrupted during post-recording, whereas in this determination method, the reference device (reference device model) and the reference device are used. Assuming a playback algorithm (reference playback algorithm) that becomes, the configuration of the continuous area is determined so that the video and audio will not be interrupted even if the audio stream is played back in synchronization with the AV multiplexed stream.

The reason will be described below. First, second,
As in the fifth embodiment, when the area for recording the post-recording audio data is multiplexed with the AV stream at the time of recording, the AV multiplexing is performed when the video data, the main audio data and the post-recording audio data are synchronously reproduced. It is sufficient to read from the beginning of the stream.

On the other hand, when the after-recording audio data is not multiplexed in the AV multiplexed stream as in this embodiment, even when the video data, the main audio data and the after-recording audio data are reproduced in synchronization, Similar to, it is necessary to make a round trip between the AV multiplexed stream and the post-record audio data.

Furthermore, in this embodiment, the AV recorded separately is recorded.
It is also assumed that the multiplexed stream and the audio stream are played back synchronously by nondestructive editing, and the degree of freedom in recording is high. Therefore, during playback, the conditions for playing back video and audio without interruption are more severe than during post-recording. Therefore, the continuous area must be determined based on the reproduction time, not the after-recording time.

Since the reference device model is the same as that of the first embodiment described above with reference to FIG. 7, only the reference playback algorithm will be described with reference to FIG. The numbers from (1) to (6) in FIG. 18 are (1) to (6) in the following description.
Corresponding to the numbers up to.

The outline of the algorithm is as follows.
(1) Read data for playback is AV multiplexed stream 1001
Start from. (2) At the same time as the decoding of the data of the audio stream 1002 having the playback time corresponding to N VUs is completed, the audio stream 1002 is accessed. The access position is the position where the reading of the audio stream 1002 was completed the previous time.

(3) AAU having a playback time equivalent to N VUs
Read out. (4) Return to the original read position in the AV multiplexed stream 1001. (5) Read the playback data.
(6) At the same time when the decoding of the data of the audio stream 1002 having the playback time corresponding to N VUs is completed, the audio stream 1002 is accessed. The above operation is repeated.

In the reference device model, when post-recording is performed using the reference post-recording algorithm, it can be guaranteed that there is no underflow in the reproduction buffer if the following conditions are satisfied.

The condition is that while displaying N VUs,
That is, it is possible to always read N VUs and also read audio data corresponding to N VUs.

That is, Tav is the playback time per VU, and TrN is
When Tra is the time required to read N VUs, and Tra is the time required to read audio data having a playback time equivalent to N VUs, Tra must satisfy the following equation. N × Tav ≧ TrN + Tra (Formula 29) First, TrN will be described.

In reading, it is necessary to consider the jump time for division. Here, the continuous area is made to include N or more VUs. As a result, the maximum number of split jumps required to read the playback time corresponding to N VUs is one. Here, TrN is TrN = Ta + N × Tav × (Ra + Rv), where Ra and Rv are the maximum bit rates of the main audio and video in the VU.

Next, Tra will be described. The time required to read data in the audio stream is (round-trip access time to audio stream) + (audio data read time) + (access time for dividing jump in audio stream × M). Where M
Indicates the number of division jumps during reading of the audio stream.

When the bit rate of the audio data in the audio stream is Rp, Tra = 2Ta + N × Tav × Rp
/ Rs + Ta × M. Here, if each continuous area that constitutes the audio stream contains AAU for a playback time equal to or more than N VUs, M = 1 and Tra = 3Ta +
N × Tav × Rp / Rs.

Substituting Tra and TrN into <Equation 29> and summing up with N gives the following equation. N ≧ (4Ta × Rs) / (Tav × (Rs-Rv-Ra-Rp)) ... <Formula 30> That is, each continuous region forming the AV multiplexed stream is
Each must be composed of N or more VUs that satisfy <Equation 30>. By transforming this equation, N × Tav ≥ (4Ta × Rs) / (Rs-Rv
-Ra-Rp). Since the reproduction time Te of the continuous region is Te = N × Tav, Te ≧ (4Ta × Rs) / (Rs-Rv-Ra-Rp).

[0311] On the other hand, each continuous area forming the audio stream is in the AV multiplexed stream for synchronous reproduction.
It suffices to have a playback time equivalent to N or more VUs. However, since the audio stream may be played back in synchronization with an arbitrary AV multiplexed stream, each continuous area forming the audio stream needs to have a sufficient playback time.

Specifically, the reproduction time Tc needs to satisfy the following conditions when the maximum bit rates of audio and video are Ramax and Rvmax. Tc ≧ (4Ta × Rs) / (Rs-Rvmax-2Ramax) ・ ・ ・ <Formula 31><Buffersize> Next, the track buffer required for synchronized playback of AV multiplexed stream and audio stream
The size of the 502 will be described. The size required for dubbing is set based on the first embodiment.

The size Lt1 required for video data and main audio data and the size Lt2 required for sub audio data will be described separately.

First, the size required for the main audio data and the sub audio data will be described. For the main audio data and the sub audio data, the reading of the data is interrupted most when the break jump occurs once during the reading of the audio stream, and the break jump occurs immediately after returning to the AV multiplexed stream read. Conceivable.

Therefore, at least the size of the track buffer 502 must be prepared so that the reproduction can be continued during that period. The size Lt1 is Lt1 ≧ (Tra + Ta + Tav) × (Rv + Ra) ... <Formula 32>.

Next, the size required for the sub audio data will be described. Regarding sub audio data,
However, it is considered that the data reading is interrupted when the split jump occurs once during the AV multiplexed stream read, and the split jump occurs immediately after returning to the audio stream read.

Therefore, at least the size of the track buffer 502 must be prepared so that the reproduction can be continued during that period. The size Lt2 is Lt1 ≧ (TrN + Ta + Tav + 2 × Ta) × (Rv + Ra) (Equation 33).

<Processing at the time of recording> Next, the process when the user instructs recording is described. The flow of processing is the first
Since it is the same as that of FIG. 9 described in the embodiment of the above, only different points will be described. The AV multiplexed stream recorded at this time has a video bit rate Rv = 5 Mbps and an audio bit rate Ra = 256 kbps. It is also assumed that the file system management information has already been read into RAM.

First, the structure of the continuous area is set (step 701). If 1 VU consists of 2 GOP30 frames,
In Equation 30>, Rs = 20Mbps, Ta = 1 second, Rv = 5Mbps, Ra = 256kbps, T
Substituting av = about 1 second, N ≧ 5.43. Therefore, N = 6. That is, each continuous area should contain 6 VUs.

Further, in steps 702 and 707, an area where 6 or more VUs can be recorded is searched for. Also, the multiplexer does not multiplex PRUs. The other steps are the same as those in the first embodiment described above, and thus the description thereof is omitted.

<Processing at Post-Recording> Next, the process when the user instructs post-recording will be described with reference to FIG. It is assumed that the QuickTime management information regarding the AV multiplexed stream that is the target of post-recording has already been read into the RAM 102.

[0322] The reproduction data is read from the beginning of the VU at the post-recording start position (step 1101). At this time, step 1101 is repeated until the data for a sufficient reproduction time is read (step 1102).

Here, the data for a sufficient reproduction time is
This means the amount of data that does not interrupt the reproduction even when the reproduction data read interruption period is the maximum. In particular,
Assuming that PRU recording (worst time about 3 seconds) and split jump (worst 1 second) accompanying AV data reading are performed continuously,
The amount of data for seconds.

Next, the video decoder 116, the audio decoder 115, and the audio encoder 118 are activated.
(Step 1103). The audio encoder 118 encodes the sampled voice waveform into an AAU and sends it to the multiplexer at the AAU cycle. Playback time equivalent to 6 VUs,
In other words, when 6 seconds of audio data has been encoded, the host CPU is notified of the end of encoding.

Also, it is checked whether the user has instructed the end of post-recording (step 1104). If not instructed, the AV data for reproduction is read until the encoding is completed (step 1106).

After the encoding is completed, the pickup is moved to the recording position of the audio stream to record the post-recording data (step 1107). The destination is the beginning of a continuous empty area at the start of post-recording, and the end position of the previous post-recording data recording after that.

When the maximum bit rates of audio and video are set to 256 [kbps] and 15 [Mbps], respectively, the reproduction time of audio data to be continuously recorded is <Equation 18
Therefore, the size of the continuous free area is 17.9 [seconds] x 256 [kbps] = 572800 [byte] or more. When the end of the continuous free area is reached during the post-recording data recording, a continuous free area of 572800 [byte] or more is searched and recording is continued from the beginning.

If the end of dubbing is instructed, wait for the completion of the encoding of the dubbing data currently being encoded.
(Step 1108), the pickup 107 is moved to the end of the audio stream, and the post-record data is recorded (step 1109).

Lastly, the audio stream is
A track corresponding to the audio stream is added to the QuickTime management information of the AV multiplexed stream so as to be reproduced in synchronization with the AV multiplexed stream, and recorded on the optical disc 106 (step 1110).

<Processing at the Time of Reproduction> Next, the processing when the reproduction is instructed by the user will be described with reference to FIG. It is assumed that the QuickTime management information regarding the AV multiplexed stream and the audio stream to be reproduced has already been read into the RAM 102.

First, the audio data is read from the position corresponding to the reproduction start position in the audio stream.
(Step 1201). The amount of data to be read is the reproduction time corresponding to 2 × N × Tav. That is, the data amount for 12 seconds is set here. Also, 1 is set to the variable i.

The reproduction data is read from the beginning of the VU at the reproduction start position (step 1202). At this time, step 1202 is repeated until data for a sufficient reproduction time is read (step 1203).

[0333] Here, the data for a sufficient reproduction time is
This means the amount of data that does not interrupt the reproduction even when the reproduction data read interruption period is the maximum. In particular,
It is assumed that the post-record data is read (worst is about 4 seconds) and the split jump (worst is 1 second) that accompanies the AV data is continuously performed, and the data amount is 5 seconds.

Next, the video decoder and audio decoder are activated (step 1204). Also, it is checked whether or not the user has instructed to end the reproduction (step 120).
Five). If not instructed, it is checked whether the time of N × Tav × i has passed from the start of reproduction (step 1206).

If it has passed, the after-recording data having the reproduction time corresponding to N VUs is read. Then i to 1
Add. If not, VU as in step 1202
Is read (step 1207). If playback is instructed to end, it ends.

<Eighth Embodiment> Next, the eighth embodiment of the present invention will be described.
The embodiment will be described with reference to FIG. here,
Since the eighth embodiment is similar to the first embodiment described above,
Only the differences will be described. The symbols not newly defined use the definitions in the first embodiment.

<AV Stream Form> In this embodiment
The structure of the AV stream will be described. In this embodiment,
Unlike the first embodiment, the VU playback time is not limited to about 1 second. The post-recording compatible stream includes a PRU in each VU, as shown in FIG.

[0338] The PRU stores audio data that is reproduced in synchronization with the audio data in the same VU. Although the PRU is placed at the beginning of the VU here, it may be placed between the audio data and the video data.

Note that each VU may have a different reproduction time within the stream. In addition, the maximum division is performed once during VU (including the VU head, but not the AV stream head). On the other hand, the non-post-recording stream has a configuration in which PRU is removed from FIG.

Regarding the method of determining the PRU area size,
The description is omitted because it is common to the first embodiment.

<Disc Arrangement Determining Method> First, a method for determining the VU reproduction time in the post-recording non-compliant stream will be described. Here, V is set so that seamless playback does not fail in the reference device model of FIG. 7, that is, there is no underflow in the track buffer 502.
U Set the playback time.

Even under the worst condition, it is necessary to guarantee that the track buffer 502 does not underflow.
It suffices if at least one VU can be read from the start of VU decoding to the start of the next VU decoding.

Here, the worst condition will be described. First, the symbols are defined. VU # for i-th VU in stream
When i is set, the playback time of VU # i is set to Td (i). Further, the minimum VU reproduction time in the stream is Tdmin, and the maximum VU reproduction time is Tdmax. Incidentally, it is assumed that there is a relationship of Tdmax = Tdmin + d.

At this time, the worst condition is Td (i) = Tdmin, T
This is the case when d (i + 1) = Tdmax and only VU (i) exists in the track buffer 502 at the start of reading VU (i + 1). This is because the VU to be read is the largest and the time available for reading is the smallest.

If the VU can be read under this condition, the VU must be read immediately before the decoding of each VU.
Since it exists in 502, the track buffer 502 does not underflow during the entire reproduction period.

In order to read VU under the above-mentioned worst condition, it is necessary to satisfy the following equation. Tdmin ≧ Trmax + Ta ・ ・ ・ <Equation 34> Here, Trmax in the first term on the right side represents the time required to read the VU of the reproduction time Tdmax, and Trmax = Tdmax × (Rv + Ra) / Rs = (Tdmin + d) × (Rv + Ra) / Rs ... <Equation 35>.

The second term on the right side represents the time required for a split jump during VU reading. Here, there is a maximum of 1 division in VU
Since it is a cycle, it becomes 1 × Ta. By substituting <Equation 35> into <Equation 34> and summing up with Tdmin, Tdmin ≧ (d × (Rv + Ra) + TaRs) / (Rs-Rv-Ra) ... <Equation 36> is obtained.

In other words, according to the bit rate of data,
It is necessary to determine the maximum value Tdmax and the minimum value Tdmin of the VU reproduction time in the stream so as to satisfy the above formula. When the above formula is satisfied, VU is added to the track buffer 502 in the initial state.
If one exists, seamless playback will always be guaranteed unless there is a shock or other disturbance.

As a method of determining the reproduction time, a method of first determining the maximum value of the VU reproduction time and then determining the minimum value based on the above equation can be considered.

The size of the track buffer 502 is at least the playback time Tdm while decoding the VU having the playback time Tdmax.
You need to be prepared to read the ax VU. If the decoded section of the VU in the track buffer 502 cannot be reused, its size is 2 × (Rv + 2Ra) × Tdmax.

Next, the VU in the post-recording compatible stream
A method of determining the reproduction time of will be described. 6th mentioned above
Similar to the embodiment described above, a reference device model and a reference dubbing algorithm are assumed, and the playback time is set so that seamless playback does not break down when dubbing is performed using them.

In the reference device model, when post-recording is performed using the reference post-recording algorithm, there is no overflow of the post-recording buffer 504 and no underflow of the track buffer 502 if the following conditions are satisfied. Can be guaranteed.

The condition is that at least one VU can be read from the start of decoding one VU to the start of decoding the next VU even under the worst condition.

Here, the worst condition is Td (i) = Tdmin, T
When d (i-1) = Td (i + 1) = Tdmax, there is a case where only VU (i) exists in the track buffer 502 at the start of reading VU (i + 1). Because the VU to read is the largest,
Moreover, the time available for reading is the smallest.

Under the worst condition, if the VU can be read, the VU always exists in the track buffer 502 immediately before the decoding of each VU, and therefore the track buffer 502 does not underflow during the entire post-recording period.

Since the post-recording data is recorded on the disk in synchronization with the completion of the PRU encoding, the data in the post-recording buffer 504 does not accumulate and the post-recording buffer 504 does not overflow.

Under the above-mentioned worst condition, in order to read VU, the following formula must be satisfied. Tdmin ≧ Trmax + Ta + Twmax ... <Formula 37> where Trmax in the first term on the right side of <Formula 37> is the reproduction time Tdmax.
Is the time required to read VU of Trmax = Tdmax × (Rv + Ra + Rp) / Rs = (Tdmin + d) × (Rv + Ra + Rp) / Rs ... <Equation 38>.

<Expression 37> The second term on the right-hand side represents the time taken for a split jump during VU reading. Here, the division in the VU is one at a maximum, so it becomes 1 × Ta. Also, Twmax in the third term on the right side of <Expression 37> is the time required for recording the PRU of the reproduction time Tdmax, and Twmax = 3Ta + Tdmax × Rp / Rs + Ty = 2Ta + (Tdmin + d) × Rp / Rs + Ty ... <Formula 39>.

Here, Ty represents the maximum recording time other than the post-recording data in the ECC block including both ends of the PRU, and Ty = 2 × 32 KB / Rs. 3 times each access PR
Represents round-trip access to U and access during PRU recording. Incidentally, as in the sixth embodiment, if the PRU is always recorded in the continuous area, the access can be made only twice.

Substituting <expression 38> and <expression 39> into <expression 37>,
When summarized by Tdmin, Tdmin ≧ ((4Ta + Ty) × Rs + d × (Rv + Ra + Rp)) / (Rs-Rv-Ra-2Rp) ... <Equation 40>. That is, depending on the bit rate of the data,
>, The maximum value of VU playback time in the stream
It is necessary to determine Tdmax and the minimum value Tdmin.

In this embodiment, the number of divisions in the VU is set to 1 at maximum for both the post-recording compatible stream and the non-post-recording compatible stream, but any number of times N may be used. As a result, the continuous region length can be relatively shortened, which has the advantage of increasing the degree of freedom of arrangement. In that case, it is necessary to change Ta so that the second term on the right side of <Expression 35> is multiplied by N.

Further, in the present embodiment, the number of divisions within the VU (including the VU head) is set to a maximum of 1, but each continuous area forming the AV stream must include the VU head at least once. You may restrict it so that it will be done. Alternatively, each continuous region may be restricted so as to include a complete VU.

Further, if the VU playback time in the stream is a fixed value Td, the continuous area length is (d) Td × (Rv + Ra + Rp) or more in the case of (1) post-recording compatible stream and (2) non-post-recording compatible stream. In this case, it may be limited to Td × (Rv + Ra) or more.

The size of the track buffer 502 is at least the playback time Tdm while decoding the VU of at least the playback time Tdmax.
You need to be prepared to read the ax VU. If the decoded section of the VU in the track buffer 502 cannot be reused, its size is 2 × (Rv + Ra + Rp) × Tdmax.

Further, in the present embodiment, for the reason explained in the first embodiment, it is assumed that the division jump and the movement of the pickup to the past RU are performed asynchronously, but the division jump and the past PRU are performed. Temin may be set on the assumption that the pickup is moved in synchronization with. In this case, the second term on the right side of <Equation 37> should be removed.

Further, in this embodiment, only the ECC block including PRU is recorded as the reference after-recording algorithm. However, as in the second embodiment, the reference recording for re-recording the entire AV stream is performed. An after-recording algorithm may be used. In that case, <Formula 38>
Rp of will be replaced by (Rv + Ra + Rp).

The difference between this embodiment and the sixth embodiment is that the track buffer 502 at the start of VU decoding in this embodiment.
If there is at least one VU in the inside, seamless reproduction after dubbing after that can be guaranteed if there is no disturbance such as shock, whereas the sixth embodiment cannot. Regarding recording, reproduction, and post-recording processing, the above-mentioned 6th
It is similar to the embodiment of.

[0368]

As described above, according to the present invention,
Real-time post-recording is surely performed by determining the unit for continuously recording in the AV stream by one of the pickup movement performance, the data transfer rate, the data bit rate, and the control of data rewriting in the post-recording area. Will be possible.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration in an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing the relationship between management information and an AV stream in the QuickTime file format.

FIG. 3 is an explanatory diagram showing an outline of management information in the QuickTime file format.

FIG. 4 is an explanatory diagram showing a structure of a stream according to the first embodiment of this invention.

FIG. 5: Non-recording support in the first embodiment of the present invention
It is explanatory drawing which shows the structure of VU.

FIG. 6 is a post-recording VU according to the first embodiment of the present invention.
It is explanatory drawing which shows the structure of.

FIG. 7 shows a reference in the first embodiment of the present invention.
It is explanatory drawing which shows a device model.

FIG. 8 shows a reference in the first embodiment of the present invention.
It is explanatory drawing which shows an after-recording algorithm.

FIG. 9 is a flowchart showing a recording operation in the first embodiment of the present invention.

FIG. 10 is a flowchart showing an after-recording operation in the first embodiment of the present invention.

FIG. 11 is a flowchart showing a reproducing operation in the first embodiment of the present invention.

FIG. 12 is an explanatory diagram showing a reference after-recording algorithm according to a second embodiment of the present invention.

FIG. 13 is a flowchart showing a first dubbing operation in the fourth embodiment of the present invention.

FIG. 14 is a flowchart showing a second post-recording operation in the fourth exemplary embodiment of the present invention.

FIG. 15 is a flowchart showing an after-recording operation in the fifth embodiment of the present invention.

FIG. 16 is an explanatory diagram showing a structure of an after-recording compatible stream according to a sixth embodiment of the present invention.

FIG. 17 is an explanatory diagram showing a reference dubbing algorithm according to the sixth embodiment of the present invention.

FIG. 18 is an explanatory diagram showing a reference playback algorithm according to the seventh embodiment of the present invention.

FIG. 19 is a flowchart showing an after-recording operation in the seventh embodiment of the present invention.

FIG. 20 is a flowchart showing a reproducing operation in the seventh embodiment of the present invention.

FIG. 21 is an explanatory diagram showing the structure of an after-recording compatible stream according to the eighth embodiment of the present invention.

FIG. 22 is an explanatory diagram showing a recording form on a disc according to a conventional technique.

FIG. 23 is a schematic diagram showing the movement of the head during dubbing and the change in the data occupancy rate in the buffer memory 108 in the conventional technique.

[Explanation of symbols]

100 bus 101 Host CPU 102 RAM 103 ROM 104 User interface 105 system clock 106 optical disk 107 pickup 108 ECC decoder 109 ECC encoder 110 Playback buffer 111 Recording / recording buffer 112 Demultiplexer 113 multiplexer 114 Multiplexing buffer 115 audio decoder 116 video decoder 117 audio encoder 118 video encoder

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G11B 27/034 H04N 5/91 C H04N 5/91 NZ G11B 27/02 K (72) Inventor Takayoshi Yamaguchi 22-22 Nagaike-cho, Abeno-ku, Osaka-shi, Osaka Prefecture, F-term in SHARP Co., Ltd. (reference) 5C053 FA14 FA23 GB01 GB05 GB11 JA01 JA03 JA05 LA11 5D044 AB05 AB07 AB10 BC06 CC06 DE02 DE03 DE12 DE14 DE48 DE54 DE92 EF03 EF05 FG23 GK08 GK12 5D090 AA01 BB04 CC01 CC04 CC14 DD03 5D110 AA17 AA27 AA29 CA07 CF05 DB02

Claims (32)

[Claims] 1. First data consisting of video or audio,
A data recording method of arranging first data and second data reproduced in synchronization with each other continuously on a recording medium to form a first unit and recording the first unit on the recording medium. The size of the recording unit of the first unit is determined based on one of the pickup movement performance, the data transfer rate, the data bit rate, and the control for rewriting the second data while reproducing the first data. A data recording method characterized by determining. 2. The data recording method according to claim 1, wherein an upper limit is set when determining the size of the recording unit of the first unit. 3. The data recording method according to claim 1, wherein a lower limit is set when determining the size of the recording unit of the first unit. 4. A first data consisting of video or audio,
A data recording method of arranging first data and second data reproduced in synchronization with each other continuously on a recording medium to form a first unit and recording the first unit on the recording medium. The amount of memory used when rewriting the second data is
A data recording method, which is determined based on one of a pickup moving performance, a data transfer rate, a data bit rate, and the second data rewriting control. 5. The data recording method according to claim 1, wherein the control of rewriting the second data is control of rewriting the entire first unit. 6. The data recording method according to claim 1, wherein the control of rewriting the second data is a control of rewriting only the second data. 7. The control of the second data rewriting is performed after once reading an error correction block including at least one of a start end and an end of the second data. Data recording method described. 8. The data recording method according to claim 7, wherein the reading of the error correction block is performed at the time of reading the first data. 9. The data recording method according to claim 1, wherein the first unit is composed of one or more second units that can be independently reproduced. 10. A first unit is formed by continuously arranging first data composed of video or audio and second data reproduced in synchronization with the first data on a recording medium. A data recording method for configuring and recording on a recording medium, wherein the first unit is composed of a second unit capable of independent reproduction, and the second data is stored in the second unit. A third unit is included, and the size of the recording unit of the first unit is set to the pickup movement performance, the data transfer rate, the bit rate of the data, and the second data rewriting while reproducing the first data. The control of the second data rewrite is performed based on one of three or more third control.
The data recording method is characterized in that the control is performed by rewriting for each unit. 11. A first unit is formed by continuously arranging first data composed of video or audio and second data reproduced in synchronization with the first data on a recording medium. A data recording method of configuring and recording on a recording medium, wherein the first unit is composed of a second unit capable of independent reproduction, and the second data rewriting while reproducing the first data. Is a control for rewriting only the second data, and the size of the recording unit of the first unit is determined based on the reproduction time of the second unit. 12. A first unit is formed by continuously arranging only first data consisting of video or audio and / or second data reproduced in synchronization with the first data on a recording medium. A data recording method for configuring and recording on a recording medium, wherein the method for determining the recording unit of the first unit is different depending on whether the second data exists or not. Recording method. 13. The data recording method according to claim 1, wherein a recording unit of the first unit is defined by a reproduction time. 14. A first unit is formed by continuously arranging first data consisting of video or audio and second data reproduced in synchronization with the first data on a recording medium. A data recording method for configuring and recording on a recording medium, wherein a reference bit rate for securing an area in the first unit for storing the second data is
The data recording method is characterized in that it is set independently of the data bit rate. 15. The method according to claim 1, wherein a reference bit rate for securing an area in the first unit is a maximum bit rate of the second data.
The data recording method described in 4. 16. The reference bit rate for securing an area in the first unit is set to a bit rate lower than a bit rate of audio in the first data. Data recording method described in. 17. A first unit is formed by continuously arranging only first data consisting of video or audio and / or second data reproduced in synchronization with the first data on a recording medium. A data recording method of configuring and recording on a recording medium, wherein when the second data does not exist, the first unit is a plurality of units that are units continuously arranged on the recording medium. A data recording method comprising two units, wherein when the second data is present, the first unit is constituted by the second unit alone. 18. A first unit is formed by continuously arranging first data consisting of video or audio and second data reproduced in synchronization with the first data on a recording medium. A data recording method for configuring and recording on a first recording medium, wherein when recording the second data while reproducing the first data, the data is temporarily recorded in a recording area on the second recording medium. A data recording method characterized by the above. 19. The method according to claim 18, wherein after the recording of the second data, the recording area of the second recording medium is moved to the first unit of the first recording medium. Data recording method described in. 20. When the first data is reproduced, the first data is reproduced.
20. The data recording method according to claim 18, wherein only the second data that cannot be recorded on the second recording medium is recorded on the second recording medium. 21. The data recording method according to claim 18, wherein the second recording medium is the same recording medium as the first recording medium. 22. A recording area on the second recording medium,
22. The data recording method according to claim 21, wherein the data recording area is an area on the first unit. 23. The data recording method according to claim 18, wherein the second recording medium is a semiconductor memory. 24. A first unit is formed by continuously arranging first data consisting of video or audio and second data reproduced in synchronization with the first data on a recording medium. A data recording device configured to record on a recording medium, wherein the reproduction time of the first unit is one of a pickup movement performance, a data transfer rate, a data bit rate, and a second data rewrite control. A data recording apparatus comprising means for determining based on the above. 25. A first unit is formed by continuously arranging first data consisting of video or audio and second data reproduced in synchronization with the first data on a recording medium. A data recording device configured to record on a first recording medium, wherein when recording the second data while reproducing the first data, the data is temporarily recorded in a recording area on the second recording medium. A data recording device comprising means. 26. A recording medium on which first data composed of video or audio and second data reproduced in synchronization with the first data are recorded. Data of a predetermined reproduction time and second data reproduced in synchronization with the data are managed as a first unit, and the reproduction time of the first unit is the pickup movement performance, the data transfer rate, A recording medium, which is determined based on one of a data bit rate and a second data rewriting control. 27. A data recording method for recording, on a recording medium, first data composed of video or audio, and second data reproduced in synchronization with the first data, wherein Managing the data for a predetermined reproduction time in the data and the second data reproduced in synchronization with the data as the first unit, and reproducing the reproduction time of the first unit by the first unit. A data recording method, characterized in that it is determined based on the number of physical discontinuities on a recording medium in the unit. 28. The data recording method according to claim 27, wherein only the second data is controlled to be physically and continuously recorded on a recording medium. 29. The first data in the first unit is composed of a set of second units which are independently reproducible units, and is characterized in that the first data is included in the first unit. Data recording method. 30. A data recording method for recording first data composed of audio on a recording medium, wherein a continuous recording time of the first data on the recording medium is reproduced in synchronization with the first data. The data recording method is characterized in that the determination is made based on the maximum bit rate of the second data composed of video and audio that may occur. 31. A data recording device for recording, on a recording medium, first data composed of video or audio, and second data reproduced in synchronization with the first data, wherein Means for managing, as a first unit, data corresponding to a predetermined reproduction time in the data, and second data reproduced in synchronization with the data, and a reproduction time of the first unit, And a means for determining based on the number of physical discontinuities on the recording medium in one unit. 32. A recording medium on which first data composed of video or audio and second data reproduced in synchronization with the first data are recorded. Data of a predetermined reproduction time and second data reproduced in synchronization with the data are managed as a first unit, and the reproduction time of the first unit is recorded in the first unit. A recording medium characterized by being based on the number of physical discontinuities on the medium.