JP2000082264A - Recording medium, recording method, and recording device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply and easily realize post-recording by periodically arraying a recording block for video data and audio data on recording tracks at a predetermined ratio. SOLUTION: One logical zone consists of data areas and spare areas. A minimum recording unit in one logical zone is an ECC block, and each ECC block is distributed for video recording and audio recording at a predetermined ratio. Namely, each 21st ECC block from a head of the data area is allocated for audio recording, and the other ECC blocks are allocated for video recording. When post-recording a video data or an audio data onto such a disk, the video data or the audio data are recorded in an ECC block for the video data recording in the neighborhood of the reproducing position at the time of post-recording or in the recording block for the audio data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium, a recording apparatus therefor, and a recording method therefor, and more particularly to a recording medium capable of additionally writing video data or audio data during reproduction, which is applicable to so-called post-recording.

[0002]

2. Description of the Related Art Conventionally, a VCR capable of post-recording audio data on a video tape has been commercialized. In such a VCR, video data and audio data are recorded on different tracks on a tape by different heads. Therefore, it is relatively easy to additionally record audio data while reproducing video data.

[0003]

On the other hand, in the case of a medium having a single track such as a magneto-optical disk, recording is usually performed by a single head. It cannot be applied as is. Further, according to the above-mentioned conventional technology, since the video track and the audio track are separate, it was relatively easy to record and synchronize the video and the audio, and to reproduce the same in a synchronized manner. When recording with a single head on a track, it is difficult to simultaneously record or reproduce video data and audio data in time series.

Accordingly, the present invention provides such a single track,
It is an object of the present invention to provide a recording medium and a recording apparatus that can easily and easily realize post-recording even in recording or reproduction with a single head.

[0005]

In order to solve the above problems, the present invention has the following features.

According to a first aspect of the present invention, there is provided a recording medium wherein recording blocks for video data and recording blocks for audio data are periodically arranged on recording tracks at a predetermined ratio.

According to a second aspect of the present invention, when recording video data or audio data on a recording medium on which recording tracks are formed by a series of recording blocks,
A recording area for each data is allocated so that video data and audio data are periodically arranged on a recording track at a predetermined ratio, and the video data or audio data is recorded according to the allocation. Is the way.

According to a third aspect of the present invention, there is provided a recording method for recording different types of data on a recording medium, comprising: a reproducing step of reproducing first data recorded on the recording medium; A storage step of storing second data of a type different from the first data in response to the input additional recording instruction, and a recording step of recording the stored second data on the recording medium in response to the additional recording instruction And wherein the tracks on the recording medium are each the first track.
A first recording block for recording data and a second recording block for recording the second data are divided so as to be periodically included at a predetermined ratio, and the recording step is performed in the vicinity of the first recording block to be reproduced. And recording the recorded second data in a second recording block located at the position (1).

According to a fourth aspect of the present invention, in the recording method of the third aspect, video data and audio data can be recorded on the recording medium, and one of the video data and the audio data is the first data. It is characterized in that the other is recorded in the recording block and the other is recorded in the second recording block.

According to a fifth aspect of the present invention, in the recording method according to the third or fourth aspect, the recording step is performed in the second recording block located behind the reproduced first recording block. It is characterized by recording two data.

According to a sixth aspect of the present invention, in the recording method of the fifth aspect, a ratio between the first recording block and the second recording block in one cycle is determined by a transfer rate of the video data and a transfer rate of the audio data. , Video and audio are set to be recorded for substantially the same time in the one cycle.

According to a seventh aspect of the present invention, video data or audio data is recorded on a recording medium in which recording blocks for video data and recording blocks for audio data are periodically arranged on recording tracks at a predetermined ratio. A recording device that reproduces the recording medium, a recording instruction device that issues a command to record video data or audio data at the time of the reproduction, and a video data or a video data in response to a recording instruction from the recording instruction device. A storage unit for storing audio data, and the video data or the audio data stored in the storage unit in response to the recording instruction for the video data in the vicinity of the reproduced video data recording block or the audio data recording block. Record to recording block or recording block for audio data And having a that recording means.

[0013] The invention according to claim 8 is a recording apparatus for recording different types of data on a recording medium, wherein each of the tracks on the recording medium has a first data for recording first data.
A recording block which divides a recording block and a second recording block for recording second data different from the first data so as to periodically include the recording block at a predetermined ratio and records the first data or the second data on the recording medium. Means, playback means for playing back the first data recorded on the recording medium, and storage means for storing the second data in response to an additional recording command input during the playback, The recording unit records the stored second data in a second recording block located near the reproduced first recording block in response to the additional recording command.

According to a ninth aspect of the present invention, in the recording apparatus of the eighth aspect, video data and audio data can be recorded on the recording medium, and one of the video data and the audio data is the first data. It is characterized in that the other is recorded in the recording block and the other is recorded in the second recording block.

According to a tenth aspect of the present invention, in the recording apparatus according to the ninth aspect, the recording means stores the stored second data in the second recording block located behind the first recording block. It is characterized by recording.

The invention of claim 11 is the invention of claim 9 or 10
In the recording apparatus, the ratio between the first recording block and the second recording block in one cycle is such that video and audio are transmitted in the one cycle in accordance with the video data transfer rate and the audio data transfer rate. It is characterized in that it is set to be recorded for substantially the same time.

[0017]

Embodiments of the present invention will be described below. In this embodiment, an ASMO (Advanced Storage Ma
The present invention is applied to a magneto-optical disk conforming to the gneto optical disc standard.

FIG. 3 shows a disk according to the present embodiment. A spiral groove is formed on the disk, and data is recorded on a flat portion (land) between the groove and an adjacent groove. Data recording proceeds from the outer periphery to the inner periphery. After data is recorded on the land for 128 ECC blocks, which will be described later, the process returns to the groove located at the start position of the recording, and data recording for 128 ECC blocks is performed again therefrom. A logical zone (to be described later) of 256 ECC blocks is formed by recording the land and groove as a set. Data recording and erasing or additional recording are performed for each logical zone. At the time of data reproduction, a track jump is performed for each logical zone and reproduction is performed seamlessly.

Therefore, the disk has a form in which the recording area is divided in the radial direction as shown in FIG. The number of divisions of such a recording area is 714. That is, the disk has 714 logical zones as divided recording areas.

FIG. 2 shows the configuration of each logical zone.
One logical zone is roughly divided into a data area and a spare area. Here, the data area is an area for recording data, and the spare area is an area for compensating for a defect (defect) in the data area. There are two ways to compensate: slipping replacement and linear replacement.
Two methods can be adopted.

The minimum recording unit in the logical zone is E
This is a CC block, and one ECC block has a data capacity of 32 Kbytes. The ECC block is a unit to which error correction is applied inside the block, and when the error amount exceeds a predetermined threshold, the block is determined to be a defective block. If the predetermined ECC block is a defective block, for example, if linear replacement is employed as the above-described method of compensation, data is recorded in the ECC block in the spare area instead of the defective block.

In the present embodiment, in such an ASMO disk, each ECC block is allocated for video recording and audio recording at a predetermined ratio so as to enable post-recording. That is, as shown in FIG. 2, every 21st ECC block from the beginning of the data area is allocated for recording audio data, and the other ECC blocks are allocated for recording video data.

When the transfer rate of video data is 5 Mbps, video data of about 1 second can be recorded in these 20 video data ECC blocks. Similarly, the transfer rate of the audio data is set to 256 Kbps.
In this case, audio data for one second can be recorded in one audio data ECC block.
Therefore, in the case of the above transfer rate, 21 ECs
Recording of video data and audio data for one second can be realized by using the C block as a unit.

The above-mentioned 20 video data ECCs
If video data of 1 second is recorded in the block at a transfer rate of 5 Mbps, 1
There is a free area of 20K bits. In such an empty area, dummy padding may be recorded.

When MPEG data is recorded on the disk, two GOP data of 15 frames are allocated to 20 ECC blocks for video data.

When dubbing video data or audio data on the above-mentioned disc, video data or audio data is recorded in a video data ECC block or audio data ECC block near the reproduction position at the time of dubbing. For example, when dubbing audio data while reproducing video data using the disc, the audio data is additionally recorded in an audio data ECC block that first arrives immediately after reproducing the video data at that position. What should I do? According to this, at the transfer rate described above, there is a time gap of about 1 second between the reproduction of the video data and the reproduction of the audio data.

If the one-second gap becomes a problem, the video data and the audio data read from the disk are temporarily stored in a memory, and then the data is controlled so as to be read out from the memory in synchronization. For example, video playback and audio playback can be synchronized. Naturally, the capacity of such a memory is smaller when the arrangement of the video data and the audio data on the disk is closer to each other. In the above-described embodiment, the post-recording at the time of post-recording is performed at the nearest position of video data or audio data (recording area that appears immediately after reproduction).
The reason for this is to reduce the memory capacity in this way. In the above embodiment, the above-mentioned synchronous reproduction is possible if there is a memory of about 6 mega.

FIG. 1 shows a recording / reproducing apparatus for performing post-recording.

The recording / reproducing apparatus shown in FIG. 1 comprises a controller 2, a buffer 3, an MPEG system encoder / decoder 4, a buffer 5, a video encoder decoder 6, an RA
M (Random Access Memory) 7, audio encoder decoder 8, RAM 9, video DA / AD converter 1
0, monitor unit 11, audio DA / AD converter 1
2, audio reproduction unit 13, microphone unit 14, and camera unit 15
It is composed of

Reference numeral 1 denotes a magneto-optical disk according to the AS-MO standard. Further, the data recording / reproducing system for the disk 1 is composed of a single magneto-optical head and a servo circuit (a focus servo circuit, a tracking servo circuit, a disk rotation servo circuit, etc.), like the recording / reproducing system of a normal magneto-optical disk. The illustration and the description are omitted because it is related to a known technique.

First, the reproducing operation during post-recording will be described.

The A / V data seamlessly reproduced from the disk 1 for each logical zone is temporarily written to the buffer 3 via the controller 2 in order to absorb a time gap during the seamless reproduction, and thereafter, the controller 2
And the MPEG system encoder / decoder 4 separates (decodes) from the MPEG packing into video data and audio data. In the decoding process, the video data and the audio data are temporarily stored in the buffer 5, respectively.

The audio data and the video data stored in the buffer 5 are transferred to the respective decoders 6 and 8 after the transfer of the audio data and the video data to the respective decoders based on the MPEG time stamp and the like.
The data is decoded by the decoder 6 and the audio encoder decoder 8. In the decoding, data is transferred between the RAMs 7 and 9 and the video encoder / decoder 6 and the audio encoder / decoder 8 for data processing.

Thereafter, the video data is stored in the video DA A
The video signal is DA-converted by the D converter 13,
It is reproduced by the monitor unit 11. The audio data is DA converted into an audio signal by the audio DA / AD converter 12 and reproduced by the audio reproducing unit 13.

At the time of such reproduction, when the user issues an audio post-recording instruction, the audio input from the microphone 14 is additionally recorded in the audio ECC block. Such additional recording is performed as follows.

First, the audio signal input from the microphone 14 is converted into digital data by the audio DA / AD converter 12 and further encoded by the audio encoder / decoder 8. Thereafter, the encoded audio data is stored in the buffer 5 via the MPEG system encoder / decoder 4. Thereafter, the audio data is read from the buffer 5 at the timing when the recording / reproducing head scans the audio ECC block appearing immediately after the A / V reproduction, and is recorded on the disk via the controller.
Thus, after-recording audio data is additionally recorded in the audio ECC block immediately after A / V playback.

Although FIG. 1 shows a recording / reproducing system for performing audio dubbing as described above, the target of additional recording is also changed from audio data to video data when dubbing video. In this case, it can be realized by the same configuration and processing as in FIG. That is, after the image pickup signal picked up by the camera unit 15 at the time of the post-recording command is converted into digital data by the video DA / AD converter 10, it is encoded by the video encoder / decoder 6, and the buffer 5, MPEG system encoder / decoder 4 and the controller 2 write the video data in the ECC block for video data immediately after the A / V reproduction by controlling the timing. In this way, after-recording of video data can be achieved.

The embodiment according to the present invention has been described above.
The present invention is not limited to such an embodiment, and it goes without saying that various other modifications are possible.

For example, in the above embodiment, as shown in FIG. 2, 20 video data ECC blocks and 1
One audio data ECC block constitutes one block (one cycle), and video data and audio data for about 1 second are allocated to this block. Instead, as shown in FIG. One block (one cycle) is composed of ten ECC blocks for video data and one ECC block for audio data, and video data and audio data for about 0.5 seconds are allocated to this block. good.

In such a case, ten ECs for video data are used.
One GOP data for 15 frames is allocated to the C block.

In this configuration, the transfer rate (25) is assigned to one audio data ECC block.
When audio data is recorded at 6 Kbps for 0.5 seconds, an empty area of 16 Kbytes is generated in the audio ECC block. Dummy padding may be recorded in this empty area.

Comparing this configuration with the configuration shown in FIG. 2, the configuration shown in FIG. 4 has a disadvantage that the use efficiency of the ECC block for audio data is lower. That is, in the configuration of FIG. 2, audio data for one second is recorded in the audio data ECC block with almost no free space, but in the configuration of FIG. 4, the recording capacity of the audio data ECC block is The audio data for 0.5 seconds is recorded in only half of the space, and the other half is wasted as free space.

On the other hand, in the case of FIG. 4, the time difference between the video data ECC block reproduced at the time of post-recording and the audio data ECC block additionally recorded by post-recording is a maximum of 10 ECC blocks. The time difference in the case of the configuration of FIG.
The block is a C block, and the configuration of FIG. 4 can reduce (to about a half) the time delay between video and audio during post-recording. Therefore, when synchronizing video data and audio data during reproduction, the configuration of FIG. 4 has a higher RA than the configuration of FIG.
The capacity of M7 can be reduced to about half.

Further, in the above embodiment, the arrangement of the video data ECC block and the audio data ECC block is shown assuming that the reproduction transfer rate of the video data is 5 Mbps. Need to be changed to That is, the ratio between the ECC block for video data and the ECC block for audio data in one cycle may be determined by the ratio between the transfer rate of video data and the transfer rate of audio data.

Even if the bit rates are the same, the arrangement of the blocks can be changed according to the limitation of the memory capacity. Further, it is preferable that the post-recording at the time of post-recording be an audio data ECC block (or video data ECC block) appearing immediately after the reproduced video data ECC block (or audio data ECC block). The ECC block for audio data (or the ECC block for video data) appearing two or three or more cycles later may be additionally recorded as necessary.

In addition, the present embodiment has been described by taking an ASMO disk as an example, but it goes without saying that the present invention can be applied to any other recordable recording medium.

[0047]

As described above, according to the present invention, a single track,
Even when a single head is applied, it is possible to provide a recording medium, a recording method, and a recording apparatus that can realize dubbing simply and easily.

[Brief description of the drawings]

FIG. 1 is a circuit block diagram of a recording / reproducing system according to an embodiment.

FIG. 2 is a diagram showing a configuration of a recording block according to the embodiment.

FIG. 3 is a diagram showing a configuration of a disk according to the embodiment;

FIG. 4 is a diagram showing a configuration of another recording block according to the embodiment;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disc 2 Controller 4 MPEG system encoder / decoder 6 Video encoder / decoder 8 Audio encoder / decoder 11 Monitor part 13 Audio reproduction part 14 Microphone part 15 Camera part

Claims (11)

[Claims] 1. A recording medium wherein recording blocks for video data and recording blocks for audio data are periodically arranged on recording tracks at a predetermined ratio. 2. When recording video data or audio data on a recording medium on which recording tracks are formed by an arrangement of a series of recording blocks, video data and audio data are periodically recorded on the recording tracks at a predetermined ratio. A recording method, comprising: allocating a recording area of each data so as to be arranged, and recording the video data or audio data according to the allocation. 3. A recording method for recording different types of data on a recording medium, comprising: a reproducing step of reproducing first data recorded on the recording medium; and an additional recording inputted at the time of the reproducing. A storage step of storing second data of a type different from the first data in response to a command, and a recording step of recording the stored second data on the recording medium in response to the additional recording command, The tracks on the recording medium are divided so as to periodically include a first recording block for recording the first data and a second recording block for recording the second data at a predetermined ratio, and Recording the recorded second data in a second recording block located near the first recording block to be reproduced. 4. The recording method according to claim 3, wherein the recording medium is capable of recording video data and audio data, wherein one of the video data and the audio data is in the first recording block and the other is in the first recording block. ,
A recording method characterized by being recorded in the second recording block. 5. The recording method according to claim 4, wherein the recording step includes recording the stored second data in the second recording block located after the reproduced first recording block. Characteristic recording method. 6. The recording method according to claim 5, wherein a ratio between the first recording block and the second recording block in one cycle is determined according to a transfer rate of the video data and a transfer rate of the audio data. And audio data are set so as to be recorded for substantially the same time in the one cycle. 7. A recording apparatus for recording video data or audio data on a recording medium in which recording blocks for video data and recording blocks for audio data are periodically arranged on recording tracks at a predetermined ratio. Reproducing means for reproducing the recording medium, recording instruction means for instructing recording of video data or audio data during the reproduction, and storing video data or audio data in response to a recording instruction from the recording instruction means. Storage means, and the video data or audio data stored in the storage means in response to the recording instruction; and a video data recording block or audio data in the vicinity of the reproduced video data recording block or audio data recording block. Recording means for recording in the recording block for Recording apparatus characterized by. 8. A recording apparatus for recording different types of data on a recording medium, comprising: a first recording block for recording first data and a first recording block different from the first data for recording tracks on the recording medium. And a second recording block for recording the second data is periodically divided at a predetermined ratio to divide the first data or the second data.
Recording means for recording data on the recording medium; reproducing means for reproducing the first data recorded on the recording medium; and the second means in response to an additional recording command input at the time of the reproduction.
Storage means for storing data, wherein the recording means stores the stored second data in a second recording block located near the reproduced first recording block in response to the additional recording instruction. A recording device for recording. 9. The recording apparatus according to claim 8, wherein the recording medium is capable of recording video data and audio data, wherein one of the video data and the audio data is in the first recording block, and the other is in the first recording block. And a recording device for recording on the second recording block. 10. The recording apparatus according to claim 9, wherein the recording means records the stored second data in the second recording block located behind the first recording block. Recording device. 11. The recording device according to claim 9, wherein a ratio between the first recording block and the second recording block in one cycle is determined according to a transfer rate of the video data and a transfer rate of the audio data. Recording apparatus, wherein video and audio are set to be recorded for substantially the same time in the one cycle.