JP3146812B2 - Signal processing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a rewritable recording medium prior to the production of a final recorded medium composed of data obtained by highly efficient encoding of an image signal and data obtained by highly efficient encoding of an audio signal. Recording and reproducing the data obtained by encoding the image signal with high efficiency and the data obtained by encoding the audio signal with high efficiency, and monitors and emulates the recording information recorded on the final recorded recording medium. The present invention relates to a signal processing device capable of performing the following.

[0002]

2. Description of the Related Art Research for transmitting, recording, and reproducing image signals by compressing the image signals with high efficiency has been actively conducted. For example, image data encoded with high efficiency on a small disk, and
A data sequence obtained by interleaving the image data and the audio data accompanying the image corresponding to the image in a time-series manner with the high-efficiency encoded audio data is recorded as data in a state as exemplified in FIG. 7, for example. , Transmission has been started. In FIG. 7, the section marked with V is a block (sector) of highly efficient compressed image data, and the section marked A is a block of highly efficient compressed audio data. (Sector).
By the way, regarding the compression of the data amount by the high-efficiency encoding of the image signal, the MPEG (Moving Picture Coding Group) (MPEG) has been developed with the aim of creating an international standard for compressing the image data by highly efficient encoding of the moving image signal. Proposes various data formats for high-efficiency compressed image data in sequence, and transmits image data that has been highly efficient compressed according to the data format proposed by MPEG (compressed image signals that have been highly efficiently compressed by the MPEG method). Research and development on practical devices for recording and reproduction are also being conducted.

In the moving picture information coding method (MPEG1 method) for a recording medium for recording digital data such as a CD-ROM, image data is compressed by applying an intra-frame prediction method. Image {I picture (Intra Pictures)} frame and image {P in which image data is compressed by applying an inter-frame prediction method in which inter-frame prediction is performed based on image data of a past frame. Picture (Predicted Pictures)} and an inter-frame prediction method that performs inter-frame prediction based on both image data of a past frame and image data of a future frame. A compressed image {B-picture (Bi-directionai Prediction Pictures)} frame and three types of temporal axis prediction image modes Each frame (I-frame, P-frame, B-frame) is, the digital data in a state of being arranged in a predetermined arrangement pattern on the time axis, and the coded image data by adding a predetermined header.

In the MPEG1 system, the relationship between the compression ratio of the image data in the I frame, the compression ratio of the image data in the P frame, and the compression ratio of the image data in the B frame is as follows. (Compression rate) <(compression rate of image data in P frame) <(compression rate of image data in B frame)
In addition, the reproduction is performed from the sequence header of the entry point, and the prediction is performed using the past image information and the image information of the future frame. In order to reproduce the image information of the B frame, the image information of the future P frame used for predicting the image information of the B frame needs to be recorded before the B frame.

FIG. 8 is a diagram for explaining the arrangement of data relating to highly efficient compressed moving image information when moving image information highly compressed by the MPEG1 system is recorded on an optical disk conforming to the CD (Compact Disk) standard. FIG. 8B shows a CD (compact disc).
This figure shows the arrangement of recorded data in sequential sector portions in which data relating to highly efficient compressed moving image information is recorded on an optical disk conforming to the standard. First, FIG. 8A shows, following the portion of the MPEG system header in each sector shown in FIG.
The contents of the data to be recorded sequentially are
(Group of Pictures). The GOP is preceded by a sequence header, followed by a GOP header,
Following the GOP header, a sequential image frame is arranged.

FIGS. 8C to 8F show the specific contents of the MPEG system header shown in FIG. 8B. The PACK header in each of the above figures is C
D recorded in each of the sequential sectors of D
em clock reference) and other information, and PTS and DTS in the figure are time stamps. Of the two types of time stamps PTS and DTS, And one of the time stamps PTS (presentation times)
tamp) is information indicating the time at which the image is actually displayed, and the other time stamp DTS (decoding tim)
(estamp) is time information indicating the time at which the MPEG video decoder starts decoding the compressed data.

[0007] There are many types of MPEG system headers as shown in FIGS. 8 (c) to 8 (f). The presence and absence of a time stamp included in the MPEG system header are also present. FIG. 8 shows the contents of the image information recorded in the sector where the MPEG system header is present, the recording mode, and the like. If both of the two types of time stamps PTS and DTS are present in the MPEG system header as shown in (c) and (d) of FIG.
In the sector where the G system header is placed, it means that the encoded I frame or P frame has started, and in particular, the MPEG system header having the content as shown in FIG. Indicates that a plurality of GOPs as illustrated in FIG. 8A are placed in the first sector in each video sequence. Also, as shown in FIG. 8E, the time stamp PT is included in the MPEG system header.
If only S exists, it means that the encoded B frame has started in the sector where the MPEG system header is placed, and furthermore, (f) of FIG.
When neither of the time stamps PTS and DTS is present in the MPEG system header as in the above, any one of the I frame, P frame and B frame is included in the sector where the MPEG system header is placed. This means that the boundary of the beginning of the image frame is not included.

The sequence header is composed of information on the horizontal size and vertical size of the image, information on the aspect ratio, and other various information in addition to the sequence header code. The GOP header is a GOP (Group of Picture).
group start code, time code, information indicating whether or not the GOP is a closed GOP, and a broken link (if it is 1, the GOP header is added thereto). BOP that exists between the I frame and the P frame that constitutes a GOP that has a role of preventing the MPEG video decoder from performing a decoding operation), and other various information And so on. The GOP includes an I-frame image data, a P-frame image data, and a B-frame image data group. The I-frame image data is always located immediately after the GOP header. Have been to be.

[0009] By the way, for example, with respect to an optical disk conforming to the CD (Compact Disk) standard, moving picture information
Variable compression ratio data of moving image information obtained by high-efficiency encoding according to the PEG1 system, that is, I-frame image data in which image data is compressed by applying an intra-frame prediction method, and inter-frame prediction method P-frame image data and image data compressed by applying
Image data in which frame image data is mixed,
A data sequence obtained by interleaving time-sequentially the above-described image data and sound data obtained by encoding a sound signal accompanying a moving image with high efficiency, for example, as shown in FIG. 7, is recorded in a sequential sector. In the case where a CD-ROM is to be created in such a manner, the recorded content must be such that the reproduction state from the completed CD-ROM as the final recorded recording medium is as intended. It is required that the data in a state where it is present be recorded.

That is, when a CD-ROM is produced by recording a data string of data obtained by encoding a video signal with high efficiency and data obtained by encoding a sound signal with high efficiency as described above, the data is recorded on the CD-ROM. When the contents of the data string are not appropriate, even if the image information is reproduced from the completed CD-ROM, for example, in the high-speed reproduction mode, the movement of the reproduced image is smooth as intended by the maker. Sometimes things don't work. When the reproduction state intended by the producer cannot be obtained from the produced CD-ROM, the CD-ROM is discarded and the reproduction state intended by the producer is obtained.
Until a CD-ROM can be manufactured, the CD-ROM must be manufactured again and again by changing the conditions for high-efficiency encoding of data. However, since the production of a CD-ROM involves a lot of cost, the state of reproduction from a completed CD-ROM, which is a final recorded medium, has been changed to the one intended by the manufacturer. The data that can be
After confirming that the data is recorded on the recording medium, in order to be able to produce a completed CD-ROM which is a final recorded recording medium, the data and the audio signal obtained by encoding the image signal with high efficiency are converted. Prior to the production of a final recorded recording medium (eg, CD-ROM) using highly efficient encoded data, the above-described image signal is encoded with high efficiency using a rewritable recording medium such as a fixed disk. Recording and reproduction of data obtained and data obtained by encoding a sound signal with high efficiency are performed.

FIG. 4 to FIG. 6 are diagrams showing rewriting prior to production of a final recorded recording medium (for example, a CD-ROM) using data obtained by highly efficient encoding of an image signal and data obtained by highly efficient encoding of an audio signal. Possible recording media (fixed disk)
FIG. 7 is a diagram for explaining a conventional example in which data obtained by highly efficient encoding of the image signal and data obtained by highly efficient encoding of an audio signal are recorded and reproduced by using FIG. 4 and FIG. Reference numeral 1 denotes an input terminal of an image signal, 2 denotes an input terminal of an audio signal, 3 denotes an encoding unit, 4 denotes a decoding unit, 5 denotes a recording / reproducing unit, 6 denotes a recording unit, and 7 denotes an image audio information output unit (image,
Sound information output unit), and the operation of each of the above components is
It is controlled by a control unit (host computer) not shown.

FIG. 4 shows an image signal supplied to the input terminal 1 and an audio signal supplied to the input terminal 2 by the encoding unit 3.
In each of the above, after performing the high-efficiency encoding, a data string composed of highly-efficient encoded data of image information and highly-efficient encoded data of acoustic information is arranged on the time axis in a predetermined arrangement manner. One data sequence is output to a recording / reproducing unit 5 capable of high-speed recording / reproducing such as a fixed disk recording / reproducing device (hard disk drive), and recorded on a recording medium of the recording / reproducing unit 5. FIG. 10 is a diagram for explaining a case where the operation is performed (at the time of a capture operation). The image signal supplied to the input terminal 1 at the time of the capture operation is converted into high-efficiency encoded image data according to the MPEG video standard by the high-efficiency encoding section 31 of the image information in the encoding section 3 and sent to the multiplexer 33. The supplied acoustic signal is supplied to the input terminal 2.
The audio data is supplied to the multiplexer 33 in the form of audio data that has been encoded with high efficiency according to the EG audio standard.

In the multiplexer 33, the high-efficiency encoded image data supplied from the high-efficiency image information encoding section 31 and the high-efficiency audio information encoding section 32
7 is stored in a read-only memory (RAM) and read out in a predetermined order, and an MPEG system header as shown in FIG. 8 is added. The data is recorded on the fixed disk in the recording / reproducing unit 5 via the interface 30 as sequential sector data as illustrated. The interface 30 of the encoding unit 3 described above, the decoding unit 4 and the recording unit 6 (recording device on a write-once recording medium), and the image and sound information output unit 7 (display and sound of an image by an image display or a speaker). (A component that emits radiation) is also connected by a signal transmission path. However, during a capture operation, the decoding unit 4 and the recording unit 6, and the image and sound information output unit 7 are inoperative. 4, the signal transmission path is shown by a dotted line in FIG.
Also, the signal transmission path indicated by a dotted line in FIG. 6 also indicates a non-operating signal transmission path).

FIG. 5 shows a state in which highly-efficiently encoded data based on image information and highly-efficiently encoded data based on audio information are arranged on a time axis in a predetermined arrangement manner.
After one data string is recorded on the fixed disk in the recording and reproducing unit 5 as described above with reference to FIG. 4, the data string is read from the fixed disk in the recording and reproducing unit 5 and decoded. FIG. 6 is an explanatory diagram of a case where an emulation operation is performed by supplying the data sequence to a decoding unit 4 at a high transfer rate from a fixed disk of a recording / reproducing unit 5 via a signal transmission path. The decoding unit 4 separates, from the data stream supplied thereto, the data in which the image information is encoded with high efficiency and the data in which the acoustic information is encoded with high efficiency with a demultiplexer, and The highly efficient encoded data is supplied to an image / acoustic information output unit 7 after being decoded into an original image signal by an image information decoding unit, and the display surface of the image / acoustic information output unit 7 is displayed. Painting The audio data separated by the demultiplexer and encoded by the high-efficiency encoding is decoded into the original audio image signal by the image information decoding unit, and then the image and audio information output unit 7 is decoded. And is emitted from the speaker of the image and sound information output unit 7.

FIG. 6 shows that the data recorded on the fixed disk in the recording / reproducing section 5 can be reproduced as intended by the manufacturer by the emulation operation described above with reference to FIG. If it is confirmed that the data has recorded content, the data string is read from the fixed disk in the recording / reproducing unit 5 and is read via the signal transmission path and the interface 30 of the encoding unit 3. The data is supplied to the recording unit 6, and the recording unit 6 records the data on a write-once recording medium.

[0016]

By the way, in the conventional apparatus described above with reference to FIGS. 4 to 6, at the time of the capture operation illustrated in FIG. The contents of certain data cannot be monitored at the same time as the recording operation, and during the emulation operation illustrated in FIG. 5, the data is read from the fixed disk of the recording / reproducing unit 5 and decoded. Since the transfer rate of the data string supplied to the converting unit 4 is different from the transfer rate of the data read from the CD-ROM, the emulation may not be performed well, and is further illustrated in FIG. At the time of recording operation, reading of a data string from the fixed disk in the recording / reproducing unit 5 and writing of data to the write-once recording medium of the recording unit 6 are performed by one interface. And the signal transmission line is shared, the use efficiency of the signal transmission line is reduced, and a lot of time is required for recording. A solution was sought.

[0017]

SUMMARY OF THE INVENTION The present invention generates data obtained by encoding an image signal with high efficiency and data obtained by encoding an audio signal with high efficiency, and generates a data stream based on the image information and an audio information. An encoding unit that outputs the data sequence as one data sequence arranged on the time axis in a predetermined arrangement manner; a recording and reproducing unit that records and reproduces the data sequence output from the encoding unit; A recording unit for recording the data sequence output from the encoding unit on the write-once recording medium, and a data sequence conforming to a predetermined standard reproduced from the final recorded recording medium, by using data based on image information and audio data. A decoding unit that divides and decodes the data into information and outputs an image signal and an audio signal, and converts the image signal and the audio signal output from the decoding unit into an image and an audio and outputs the image and the audio. You An image-acoustic-information output unit, and a signal processing device including a control unit that controls an operation state of each of the units, and a first and a second unit capable of bidirectional communication with an output side of the encoding unit. 2, two interfaces are provided, the first interface is connected to the recording / reproducing unit via a bidirectional communication path, and the second interface is connected via the bidirectional communication path. Means for selectively connecting the decoding unit and the recording unit to the encoding unit; and a data sequence from the encoding unit to the recording / reproducing unit via the first interface and the bidirectional communication path. In the state where the data sequence is supplied and the data sequence is recorded in the recording / reproducing unit, the second
Means for supplying a data string being recorded by the recording / reproducing unit also to the decoding unit via the interface and the two-way communication path, and providing a decoded output from the decoding unit to the audiovisual information output unit. In the state where the data sequence is being reproduced from the recording / reproducing unit, the data sequence having a high transfer rate reproduced from the recording / reproducing unit is supplied via the bidirectional communication path and the first interface. In the encoding unit, the data string in the high transfer rate state is converted into a data string of a transfer rate of a data string according to a predetermined standard reproduced from a final recorded recording medium, and
And a means for supplying the signal to the decoding unit via the interface of (1) and the two-way communication path.

[0018]

The data obtained by highly efficient encoding of an image signal by the high efficiency image information encoding section and the data obtained by efficiently encoding an audio signal by the high efficiency audio information encoding section are time-sequentially arranged in a predetermined arrangement. One data sequence arranged on the axis is generated by the encoding unit. The data sequence generated by the encoding unit is supplied to the recording / reproducing unit via the first interface capable of bidirectional communication and the bidirectional communication path, and is recorded on the fixed disk provided in the recording / reproducing unit. . In addition, a second interface capable of two-way communication of the data sequence generated by the encoding unit is supplied to the decoding unit 4 via the two-way communication path, and the data is decoded by the decoding unit 4. The obtained image signal and sound signal are supplied to an image / sound information output unit, where the image signal is displayed as an image on a display, and the sound signal is emitted from a speaker.

The data stream reproduced at a high transfer rate from the fixed disk in the recording / reproducing section is supplied to the encoding section supplied via the bidirectional communication path and the first interface. Is decoded through the second interface and the two-way communication path as a data stream having a transfer rate of a data stream according to a predetermined standard reproduced from the final recorded recording medium. The emulation operation is performed by supplying the data to the conversion unit. Further, the data sequence reproduced at a high transfer rate from the fixed disk in the recording / reproducing unit is transmitted to the recording unit via the bidirectional communication path and the first interface, the second interface, and the bidirectional communication path. Then, data is recorded on a write-once recording medium provided in the recording unit.

[0020]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a signal processing apparatus according to the present invention. 1 to 3 are block diagrams for explaining the operation of the signal processing device of the present invention, FIGS. 4 to 6 are block diagrams for explaining the operation of the conventional device, and FIGS. 7 and 8 are for explaining the signal configuration. FIG. FIGS. 1 to 3 show rewritable recordings before producing a final recorded recording medium (for example, a CD-ROM) using data obtained by highly efficient encoding of an image signal and data obtained by efficiently encoding an audio signal. A description will be given of a signal processing apparatus according to the present invention, which is capable of recording and reproducing data obtained by encoding a video signal with high efficiency and data obtained by encoding an audio signal with high efficiency using a medium (fixed disk). 1 to 3, reference numeral 1 denotes an input terminal of an image signal, 2 denotes an input terminal of an audio signal, 3 denotes an encoding unit,
Reference numeral 4 denotes a decoding unit, 5 denotes a recording / reproducing unit, 6 denotes a recording unit, 7 denotes an image / sound information output unit, and the operation of each of the above components is controlled by a control unit (host computer) not shown. ing.

Encoding unit 3 shown in FIGS. 1 to 3
The image signal supplied to the input terminal 1 is supplied to the multiplexer 33A as image data which has been highly coded according to the MPEG video standard in the high efficiency coding section 31 for image information. Is supplied to the high-efficiency audio information encoding unit 32.
The audio data is supplied to the multiplexer 33A in the form of audio data that has been encoded with high efficiency according to the PEG audio standard. The multiplexer 33A includes a read-only memory (RAM) and a control device. As described above, the high-efficiency encoded image data supplied from the high-efficiency encoding unit 31 for image information and the high Efficiency coding unit 32
And the highly efficient encoded audio data supplied from
After being stored in the AM, the data is read out in a predetermined order, an MPEG system header as shown in FIG. 8 is added, and one data string arranged on the time axis in a predetermined arrangement manner is exemplified in FIG. And the first and second two interfaces 34 and 3
Give 5

Therefore, as shown in FIG. 1, in the signal processing device of the present invention at the time of the capture operation, the two interfaces 3 provided in the encoding unit 3 as described above are used.
The data stream of the sequential sector as illustrated in FIG. 7 is supplied to the recording / reproducing unit 5 via the first interface 34 of one of the first and fourth communication channels 35 and the two-way communication path. Through the interface 35 and the two-way communication path of
The data string of the sequential sector as illustrated in FIG. 7 is supplied to the decoding unit 4. The recording / reproducing unit 5 records the data sequence supplied thereto on a fixed disk, and the decoding unit 4 divides the supplied data sequence into a data sequence of image information and a data sequence of acoustic information, and The data sequence of information is decoded by an image information decoding unit to obtain an image signal, and the data sequence of audio information is decoded by an audio information decoding unit to obtain an audio signal. The image signal and the acoustic signal are supplied to an image / acoustic information output unit 7. An image is displayed on a display by the image signal, and a sound is emitted from a speaker by the acoustic signal. Therefore, in the signal processing device of the present invention, the data being recorded on the fixed disk in the recording / reproducing unit 5 during the capture operation can be decoded and monitored by the output of the image / audio information output unit 7.

Next, when the signal processing device of the present invention performs an emulation operation, as shown in FIG. 2, a data string read from the fixed disk in the recording / reproducing unit 5 at a high transfer rate is bidirectional. The signal is supplied to the multiplexer 33A via the communication path and the first interface 34. In the multiplexer 33A, the data stream of the high transfer rate supplied from the recording / reproducing unit 5 is stored in the RAM, and the data stream reproduced from the final recorded recording medium (CD-ROM) is stored in the RAM. Is supplied to the decoding unit 4 via the second interface 35 and the bidirectional communication path as a data string having the same transfer rate as the transfer rate of the data. As described above, the decoding unit 4 divides the data sequence supplied thereto into a data sequence of image information and a data sequence of audio information, and the data sequence of image information is decoded by the decoding unit of image information. An image signal, and a data sequence of audio information are decoded by an audio information decoding unit to obtain an audio signal, and the image signal and the audio signal are supplied to an image / audio information output unit 7.
An image is displayed on a display according to the image signal, and a sound is emitted from a speaker according to the acoustic signal. Thus, during the emulation operation in the signal processing device of the present invention, the final recorded recording medium (C
It is easy to obtain a reproduction result in the same state as when reproducing data reproduced from a D-ROM).

According to the result of the above-described emulation operation, the data recorded on the fixed disk in the recording / reproducing unit 5 has a recording content such that the reproducing state intended by the maker is obtained. When it is confirmed that the data is in a state in which the data is recorded, that is, the data sequence recorded on the recording medium of the recording / reproducing apparatus 5 is a data sequence suitable for making a final recorded recording medium (CD-ROM). In this case, as shown in FIG. 3, the data sequence reproduced from the recording / reproducing unit 5 is transferred to the bidirectional communication path and the first interface 34 → the multiplexer 33A → the second interface 35 → the bidirectional communication path → recording. The data is supplied to the recording unit 6 by the circuit of the unit 6 and recorded on the write-once recording medium provided in the recording unit 6.

[0025]

As will be apparent from the above description, the signal processing apparatus of the present invention provides a data processing apparatus which encodes an image signal with a high efficiency in the image information high efficiency encoding unit and a high efficiency of the audio information. Data obtained by encoding the audio signal with high efficiency by the encoding unit and one data sequence arranged on the time axis in a predetermined arrangement manner are generated by the encoding unit, and data generated by the encoding unit is generated. Supplying the column to the recording / reproducing unit via the first interface capable of bidirectional communication and the bidirectional communication path,
The data is recorded on a fixed disk provided in the recording / reproducing unit, and the data string generated by the encoding unit is transmitted to the decoding unit via the second interface capable of bidirectional communication and the bidirectional communication path. And supplies the image signal and the audio signal obtained by decoding by the decoding unit 4 to an audio information output unit,
The image signal can be displayed as an image on a display, and the sound signal can be emitted from a speaker to monitor data being recorded on a recording medium of a recording and reproducing unit. The encoding unit supplied from the fixed disk in the reproducing unit at a high transfer rate with the bidirectional communication path and the first interface described above converts the data sequence in the state of the high transfer rate into an encoding unit. Supplying a data string having the same transfer rate as that reproduced from the final recorded recording medium to the decoding unit via the second interface and the bidirectional communication path to perform an emulation operation. Further, a data sequence reproduced at a high transfer rate from the fixed disk in the recording / reproducing unit described above can be communicated in two-way communication. To the recording unit via the first interface, the second interface, and the two-way communication path, and to record data on the write-once recording medium provided in the recording unit. This makes it possible to shorten the time, and according to the present invention, it is possible to satisfactorily solve the above-mentioned problems in the conventional device, and to have a recorded content that can obtain a reproduction state as intended by the maker. After confirming that state data is recorded, it is easy to make a final recorded recording medium (CD-ROM).

[Brief description of the drawings]

FIG. 1 is a block diagram for explaining an operation of a signal processing device of the present invention.

FIG. 2 is a block diagram for explaining the operation of the signal processing device of the present invention.

FIG. 3 is a block diagram for explaining the operation of the signal processing device of the present invention.

FIG. 4 is a block diagram for explaining the operation of the conventional device.

FIG. 5 is a block diagram for explaining the operation of the conventional device.

FIG. 6 is a block diagram for explaining the operation of the conventional device.

FIG. 7 is a diagram for explaining a signal configuration.

FIG. 8 is a diagram for explaining a signal configuration.

[Explanation of Codes] 3 ... coding unit, 4 ... decoding unit, 5 ... recording / reproducing unit, 6 ... recording unit, 7 ... image and sound information output unit,

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04N 5/91-5/956 G11B 20/10-20/12 H04N ^7/ 24-7/68

Claims (1)

(57) [Claims] 1. High-efficiency encoded data of an image signal,
A high efficiency coded audio signal is generated, and the data sequence based on the image information and the data sequence based on the audio information are output as one data sequence arranged on the time axis in a predetermined arrangement manner. An encoding unit to be recorded, a recording and reproducing unit for recording and reproducing the data sequence output from the encoding unit, and a recording unit for recording the data sequence output from the encoding unit on a write-once recording medium, A decoding unit that decodes a data sequence according to a predetermined standard reproduced from a final recorded recording medium into data based on image information and data based on acoustic information, and outputs an image signal and an audio signal. An image and sound information output unit that converts the image signal and the sound signal output from the decoding unit into an image and sound and outputs the image and sound, and a control unit that controls an operation state of each unit. A signal processing device, wherein two first and second interfaces capable of bidirectional communication are provided on the output side of the encoding unit, respectively, and the first interface is provided with a bidirectional communication path. Means for connecting the recording / reproducing unit to the second interface and selectively connecting the decoding unit and the recording unit to the encoding unit via a bidirectional communication path. In the state where a data sequence is supplied from the encoding unit to the recording / reproducing unit via the first interface and the bidirectional communication path, and the data sequence is recorded in the recording / reproducing unit, The data sequence being recorded by the recording / reproducing unit is also supplied from the encoding unit to the decoding unit via the second interface and the bidirectional communication path, and the decoded output from the decoding unit is supplied to the audiovisual unit. Give to the information output section And the step, in a state where the reproducing data stream from the recording and reproducing unit,
In the encoding unit in which the data sequence in the high transfer rate state reproduced from the recording / reproducing unit is supplied via the bidirectional communication path and the first interface, the data sequence in the high transfer rate state is Means for supplying a data stream having a transfer rate of a data stream in accordance with a predetermined standard reproduced from a final recorded recording medium to a decoding unit via the second interface and the bidirectional communication path; A signal processing device comprising: