JP2003022097A - Decoding device, reproducing device, and storage medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure compatibility with media between areas where different audio encoding systems are employed by encoding the same audio signal by different voice high-efficiency encoding systems and multiplexing it with the same media. SOLUTION: An audio signal inputted from an audio signal input terminal 101 is inputted to a 1st audio data encoding means 103 and a 2nd audio data encoding means 106 after A/D conversion by an A/D converter 102. The 1st audio data encoding means 103 and 2nd audio data encoding means 106 encode the same audio signal by respective high-efficiency encoding systems. The outputs of the 1st audio data encoding means 1031 and 2nd audio data encoding means 106 are multiplexed by a multiplexer 108 and then recorded on a single storage medium 202.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an audio data encoding device, an audio data encoding / recording device, an audio data decoding device, and audio data using a plurality of different high-efficiency audio encoding systems such as MPEG1 audio and MPEG2 audio. The present invention relates to a decoding / reproducing device and a storage medium.

[0002]

2. Description of the Related Art ISO11172 (commonly known as MPEG1 standard), which is a world standard encoding method for high-efficiency encoding method of moving image signals and accompanying audio signals, is applied to 1.5 Mbps digital storage media such as CD and DAT. August 1, 1993 ISO
Published by Along with this, in the field of high-efficiency coding of audio signals, LSI development applying the MPEG / Audio Phase1 algorithm (commonly called MPEG1 audio) technology is being actively conducted.

Also, the so-called MPEG2 audio, which aims to expand the MPEG1 audio to multi-channel / multi-lingual, is published as an international standard in 1995. Therefore, it is expected that the development of devices and devices that apply the MPEG2 audio technology will be actively performed in the future.

[0004]

Therefore, it is conceivable that a device which is currently adopting the MPEG1 audio technique or is about to adopt the MPEG1 audio technique will also adopt the MPEG2 audio technique in the next-generation device. Compatibility between audio and MPEG2 audio becomes a problem.

According to the MPEG standard, the requirements for MPEG2 audio include forward and backward compatibility with MPEG1 audio for multi-channel / multi-lingual encoding and forward compatibility for low sampling frequency encoding. However, the method is not specified.

[0006] Further, the audio encoding system to be adopted may differ depending on the region, but at this time, ensuring the compatibility of the medium becomes a problem.

The present invention solves the above problems and realizes forward and backward compatibility of MPEG1 audio and MPEG2 audio with a simple structure, and also realizes compatibility between regions where different audio encoding methods are adopted. It is intended to ensure media compatibility.

[0008]

In order to achieve the above-mentioned object, the present invention provides an audio data encoding apparatus having a plurality of different audio data high efficiency encoding means and packet header encoding means, in which the packet header In the stream ID described in, a specific value associated with the high-efficiency coding method is described, and in an audio data decoding device having at least one kind of audio data decoding means and a system stream analysis means, Above stream
The ID is configured to identify the high-efficiency coding method of each audio stream in the multiplexed stream.

Further, in the audio data encoding / recording apparatus having a plurality of different audio data high efficiency encoding means and system management information encoding means, the stream ID described in the system management information of the recording medium is An audio data decoding / reproducing apparatus which describes a specific value associated with a high-efficiency encoding system, and which has at least one or more kinds of audio data decoding means and system control means for processing system management information. The ID is configured to identify the high-efficiency coding method of each audio stream in the multiplexed stream.

Then, the same input audio signal is applied to each of a plurality of different high efficiency encoding systems by an audio data high efficiency encoding means for encoding the input audio signal by a plurality of different high efficiency encoding systems. Audio data decoding means having a decoding system for decoding all or part of the high-efficiency coding system to reproduce the same audio signal by at least one kind of decoding system. Further, an audio data high efficiency encoding means for encoding the input audio signal by a plurality of different high efficiency encoding methods and an encoding method selecting means for selecting the high efficiency encoding method of the audio data high efficiency encoding means are provided. The audio data encoding device has a configuration in which the same audio signal is encoded by each of a plurality of different high efficiency encoding systems by setting the encoding system selection means.

According to the present invention, the stream having the above structure is
It is possible to identify MPEG1 audio stream and MPEG2 audio stream by ID, realize forward compatibility and backward compatibility with MPEG1 audio stream and MPEG2 audio stream with a simple configuration, and between regions where different audio encoding methods are adopted. It ensures the compatibility of the media.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an audio data encoding device according to the first embodiment of the present invention.

In FIG. 1, an audio signal input terminal 101
The audio signal input from the A / D converter 102
After D conversion, it is input to the first audio data high efficiency encoding means 103. Similarly, audio signal input terminal 104
The audio signal input from the A / D converter 105
After being converted, it is input to the second audio data high-efficiency encoding means 106 using a high-efficiency encoding method different from that of the first audio data high-efficiency encoding means 103. The audio stream high-efficiency coded by the first audio data coding means 103 and the second audio data high-efficiency coding means 106 is a stream ID and time information coded by the system stream coding means 107. PTS (Presen
tation Time Stump) and is multiplexed by the multiplexer 108.

At this time, the streams 0 to 15 are high-efficiency-encoded by the second audio data encoding means 106 in the audio stream which has been high-efficiency encoded by the first audio data encoding means 103. Stream IDs corresponding to streams 16 to 31 are assigned to the audio streams. In addition, the first audio data high-efficiency encoding means 103 and the second audio data high-efficiency encoding means 10
6. The system stream coding means 107 and the multiplexer 108 are controlled by the system control means 109 so as to perform predetermined operations.

FIG. 2 is a block diagram showing the arrangement of an audio data coding / recording apparatus according to the second embodiment of the present invention. In the following figures, common blocks have the same numbers.

In FIG. 2, an audio signal input terminal 101
The audio signal input from the A / D converter 102
After D conversion, it is input to the first audio data high efficiency encoding means 103. Similarly, audio signal input terminal 104
The audio signal input from the A / D converter 105
After being converted, it is input to the second audio data high-efficiency encoding means 106 using a high-efficiency encoding method different from that of the first audio data high-efficiency encoding means 103. The audio stream that has been subjected to high efficiency encoding by the first audio data high efficiency encoding means 103 and the second audio data high efficiency encoding means 106 is the system stream encoding means 10.
PTS (Presentation Time) of the time information encoded in 7.
Stump) and multiplexed by the multiplexer 108.

The audio stream multiplexed by the multiplexer 108 is input to the system management information coding means 201, and the system management information is added to the system management information area of the recording medium. At this time, in the system management information, streams 0 to 1 are included in the audio stream highly efficient encoded by the first audio data encoding means 103.
5, the stream 16 to the audio stream highly efficient encoded by the second audio data encoding means 106
At least the stream ID corresponding to 31 is described.

The output of the system management information encoding means 201 is input to the storage medium 202 and recorded. Also,
The control of the entire system is similar to the case of the first embodiment,
This is performed by the system control means 109.

FIG. 3 is a block diagram showing the arrangement of an audio data coding / recording apparatus according to the third embodiment of the present invention.

In FIG. 3, an audio signal input terminal 101
The audio signal input from the A / D converter 102
After D conversion, it is input to the first audio data high efficiency encoding means 103. Similarly, audio signal input terminal 104
The audio signal input from the A / D converter 105
After being converted, it is input to the second audio data high-efficiency encoding means 106 using a high-efficiency encoding method different from that of the first audio data high-efficiency encoding means 103. Stream ID, PTS (Presentation Time Stump) which is time information
Packet header information including the above is encoded by the packet header encoding means 301. At this time, the audio stream high-efficiency-encoded by the first audio data encoding means 103 becomes streams 0 to 15, and the audio stream high-efficiency-encoded by the second audio data encoding means 106 becomes. Are assigned stream IDs corresponding to streams 16-31. The audio stream multiplexed by the multiplexer 108 is a system management information encoding means.
Inputted in 201, the system management information is added to the system management information area of the recording medium. The stream ID described in the packet header is double written in the system management information. The output of the system management information encoding means 201 is input to the storage medium 202 and recorded. Also,
The control of the entire system is similar to the case of the first embodiment,
This is performed by the system control means 109.

FIG. 4 is a block diagram showing the arrangement of an audio data decoding apparatus according to the fourth embodiment of the present invention.

In FIG. 4, a bit stream analysis unit 401 detects a stream ID and PTS (Presentation Time Stump) which is time information from the audio bit stream. The PTS is read by the system control means 109 composed of a CPU, a memory, etc., and the system control means 109 uses the time information of the PTS as the first audio data decoding means 403 and the second audio data decoding means.
Controls the decoding start time of 404. The data switching means 402 is
The bit stream analysis unit 401 performs data switching based on the control signal generated from the stream ID. That is, the stream ID is analyzed, and the audio streams of streams 0 to 15 are transferred to the first audio data decoding means 403.
The audio streams of the streams 16 to 31 are switched so as to be output to the second audio data decoding means 404. The audio streams input to the first audio data decoding means 403 and the second audio data decoding means 404 are decoded by the respective decoding means, and D / A
The signals are D / A converted by the converters 405 and 406 and then output from the audio signal output terminals 407 and 408. At this time, the bit stream analysis unit 401, the data switching unit 402, the first audio data decoding unit 403, the second audio data decoding unit
404 is a system control means 1 for performing a predetermined operation
Controlled at 09.

FIG. 5 is a block diagram showing the arrangement of an audio data decoding / reproducing apparatus according to the fifth embodiment of the present invention.

In FIG. 5, the data read from the storage medium 202 is input to the system management information detecting means 501, and the system management information recorded in the system management information area of the recording medium is extracted. The extracted system management information is read by the system control means 109. The system control means 109 analyzes the contents described in the system management information and controls the system based on the described contents.

The output of the system management information detecting means 501 is
The PTS (Presentation Time Stump), which is the time information, is input to the bit stream analysis unit 401 and detected.

The PTS is managed by the system control means 109, and the decoding start time is controlled by the time information of the PTS. The data output from the bitstream analysis unit 401 is input to the data switching unit 402. The data switching unit 402 performs data switching based on the control signal generated by the system control unit 109 from the stream ID described in the system management information. Ie stream
The IDs are analyzed, and the audio streams of streams 0 to 15 are sent to the first audio data decoding means 403 and stream 16
31 audio streams are switched to be output to the second audio data decoding means 404.

The first audio data decoding means 403 and the first audio data decoding means 403
The audio stream input to the audio data decoding means 404 of No. 2 is decoded by each decoding means, and D /
The signals are D / A converted by the A converters 405 and 406 and then output from the audio signal output terminals 407 and 408. The control of the entire system is performed by the system control means 109 as in the case of the fourth embodiment.

FIG. 6 is a block diagram showing the arrangement of an audio data encoding apparatus according to the sixth embodiment of the present invention.

In FIG. 6, an audio signal input terminal 101
The audio signal input from the A / D converter 102
After being D-converted, the first audio data encoding means 10
3, input to the second audio data encoding means 106 using a high efficiency encoding method different from that of the first audio data encoding means 103. First audio data encoding means
In 103 and the second audio data coding means 106, the same audio signal is coded by each high efficiency coding system and output as another stream. The system control means 109 controls the entire system.

FIG. 7 is a block diagram showing the arrangement of an audio data coding / recording apparatus according to the seventh embodiment of the present invention.

In FIG. 7, an audio signal input terminal 101
The audio signal input from the A / D converter 102
After being D-converted, the first audio data encoding means 10
3, input to the second audio data encoding means 106 using a high efficiency encoding method different from that of the first audio data encoding means 103. First audio data encoding means
In 103 and the second audio data encoding means 106, the same audio signal is encoded by each high efficiency encoding method. First audio data encoding means 103, second
The output of the audio data encoding means 106 is
And then recorded on a single storage medium 202. The system control means 109 controls the entire system.

FIG. 8 is a block diagram showing the arrangement of an audio data decoding apparatus according to the eighth embodiment of the present invention.

In FIG. 8, an audio stream obtained by encoding the same audio signal by a plurality of different high-efficiency encoding systems is input to the first audio data decoding means 403 and the second audio data decoding means 404. The control of the first audio data decoding means 403 and the second audio data decoding means 404 is performed by the system control means 109. If the input audio stream can be decoded by either the first audio data decoding unit 403 or the second audio data decoding unit 404, the output of the decodable audio data decoding unit is the first audio data decoding unit. When both the means 403 and the second audio data decoding means 404 are capable of decoding, the output of the decoding means selected by the system control means 109 is the D / A converter 406.
And is output from the audio signal output terminal 408.

FIG. 9 is a block diagram showing the arrangement of an audio data encoding apparatus according to the ninth embodiment of the present invention.

In FIG. 9, an audio signal input terminal 101
The audio signal input from is converted by the A / D converter 102, and then input to the encoding method selecting unit 901. The encoding method selection means 901 is the system control means 109.
In accordance with a command from the first audio data high efficiency encoding means 103, the second audio data high efficiency encoding means
Set 106 and sort the input data. In this embodiment, the same audio signal is set to be encoded by each encoder. In this case, the input data is input to both the first audio data high efficiency encoding means 103 and the second audio data high efficiency encoding means 106.

First audio data high efficiency encoding means 1
03, the audio stream high-efficiency coded by the second audio data high-efficiency coding means 106 is the stream I coded by the system stream coding means 107.
D, multiplexed with PTS (Presentation Time Stump) which is time information in the multiplexer 108. At this time, the audio streams high-efficiency-encoded by the first audio data encoding means 103 are stream 0 to 7, and the audio streams high-efficiency-encoded by the second audio data encoding means 106. Are assigned stream IDs corresponding to streams 16 to 23. At this time, the system control means 109 controls the entire system.

FIG. 10 is a block diagram showing the arrangement of an audio data coding / recording apparatus according to the tenth embodiment of the present invention.

In FIG. 10, an audio signal input terminal 10
The audio signal input from 1 is converted by the A / D converter 102 and then input to the encoding method selecting unit 901.
The encoding method selection means 901 is the system control means 1
According to the instruction from 09, the setting of the first audio data high efficiency encoding means 103 and the second audio data high efficiency encoding means 106 and the distribution of the input data are performed. In this embodiment, the same audio signal is set to be encoded by each encoder. In this case, the input data is input to both the first audio data high efficiency encoding means 103 and the second audio data high efficiency encoding means 106. First audio data high efficiency encoding means 103,
The audio stream highly efficient coded by the audio data highly efficient encoding means 106 of 2 is the PTS (Prese of the time information encoded by the system stream encoding means 107.
ntation Time Stump) and is multiplexed by the multiplexer 108.

The audio stream multiplexed by the multiplexer 108 is input to the system management information coding means 201, and the system management information is added to the system management information area of the recording medium. At this time, in the system management information, the streams 0 to 7 are included in the audio stream highly efficient encoded by the first audio data encoding means 103.
In addition, the stream 16 to 23 is added to the audio stream highly efficient encoded by the second audio data encoding means 106.
At least the stream ID corresponding to is described. The output of the system management information encoding means 201 is the storage medium 202.
Is entered and recorded.

At this time, the entire system is controlled by the system control means 109.

In the first to fifth embodiments of the present invention, the first high-efficiency audio data encoding method is used for the audio streams of streams 0 to 15, and the second audio stream is used for the audio streams of streams 16 to 31. In the ninth to tenth embodiments, streams 0 to 7 are added to the audio data high efficiency encoding system.
The first audio data high-efficiency encoding method is defined for the audio stream of, and the second audio data high-efficiency encoding method is defined for the audio streams of streams 16 to 23. If it is a specific value associated with, the definition method is not limited to this. For example, if the stream number is odd,
The present invention is effective even if it is defined as the first audio data high-efficiency encoding method and the second audio data high-efficiency encoding method if the stream number is an even number. Further, although the audio data high-efficiency encoding method is two kinds in the present embodiment, it may be three kinds or more.

In the present embodiment, the case where the first audio data high efficiency encoding means and the second audio data high efficiency encoding means are separate blocks has been described. It does not matter even if it has one audio data high efficiency encoding means and second audio data high efficiency encoding means.

Furthermore, in the first to fifth, ninth and tenth embodiments of the present invention, the audio signal input terminals of the first audio data encoding means and the second audio data encoding means, the first audio data encoding means The case where the audio signal decoding means and the audio signal output terminal of the second audio data decoding means, and the input terminal and the output terminal of each stream are separate blocks has been described, but even if they have the same input terminal and output terminal. The present invention is effective.

In the above embodiment, the audio data encoding device and audio data encoding / recording device and the audio data decoding device and audio data decoding / reproducing device are shown separately, but a device having only a recording system or a reproducing system. However, the device may have a single recording / reproducing system.

Further, an optical disk, a magnetic tape or the like can be considered as the storage medium of the above embodiment. Further, although the present embodiment has been described with respect to the case of recording and reproducing on the storage medium, this may be a communication medium.

Further, although the above embodiment has described the case of recording / reproducing only the audio signal, the present invention is also applicable to the case of recording / reproducing the video signal and the audio signal, or the video signal, the audio signal and other signals. Is valid.

[0047]

As described above, according to the present invention, the audio data coding having the audio data high efficiency coding means and the packet header coding means for coding the input audio signal by a plurality of different high efficiency coding systems. The device describes an audio data decoding means and a system stream analysis means for describing a specific value associated with a high efficiency encoding method in the stream ID described in the packet header and performing decoding by a plurality of decoding methods. The audio data decoding device having the above configuration is configured to identify the high-efficiency encoding method of each audio stream in the multiplexed stream by the above stream ID. Further, in the audio data coding and recording apparatus having the audio data high efficiency coding means and the system management information coding means for coding the input audio signal by a plurality of different high efficiency coding systems, the system management of the recording medium is performed. An audio data decoding / reproducing apparatus having a stream ID described in the information, in which a specific value associated with a high-efficiency encoding method is described, and having audio data decoding means and system control means for processing system management information. , The stream above
The ID is configured to identify the high-efficiency coding method of each audio stream in the multiplexed stream. Then, the same input audio signal is encoded by each of a plurality of different high-efficiency encoding schemes by audio data high-efficiency encoding means that encodes the input audio signal by a plurality of different high-efficiency encoding schemes. An audio data decoding means having a decoding method for decoding all or a part of the high-efficiency coding method is configured to reproduce the same audio signal by at least one kind of decoding method. Furthermore, an audio data high efficiency encoding means for encoding the input audio signal by a plurality of different high efficiency encoding methods, and an encoding method selecting means for selecting a high efficiency encoding method of the audio data high efficiency encoding means. In the audio data encoding device having the above, the same audio signal is encoded by each of a plurality of different high efficiency encoding systems by setting the encoding system selecting means.

As a result, the MPEG2 audio stream and the MPEG1 audio stream can be identified by the stream ID, the forward compatibility and the backward compatibility of the MPEG2 audio stream and the MPEG1 audio stream can be realized with a simple structure, and different audio codes can be used. This is to ensure the compatibility of media between regions where the digitalization method has been adopted.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an audio data encoding device according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of an audio data encoding / recording device according to a second embodiment of the present invention.

FIG. 3 is a block diagram showing the configuration of an audio data encoding / recording device according to a third embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of an audio data decoding device according to a fourth embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of an audio data decoding / reproducing apparatus according to a fifth embodiment of the present invention.

FIG. 6 is a block diagram showing the configuration of an audio data encoding device according to a sixth embodiment of the present invention.

FIG. 7 is a block diagram showing the configuration of an audio data encoding / recording device according to a seventh embodiment of the present invention.

FIG. 8 is a block diagram showing a configuration of an audio data decoding device according to an eighth embodiment of the present invention.

FIG. 9 is a block diagram showing the configuration of an audio data encoding device according to a ninth embodiment of the present invention.

FIG. 10 is a block diagram showing the configuration of an audio data encoding / recording device according to a tenth embodiment of the present invention.

[Explanation of symbols]

101,104 Audio signal input terminal 102,105 A / D converter 103 First audio data highly efficient coding means 106 Second audio data high efficiency coding means 107 System stream encoding means 108 Multiplexer 109 System control means 201 System management information coding means 202 storage media 301 Packet header coding means 401 Bitstream analysis means 402 Data switching means 403 First audio data decoding means 404 Second audio data decoding means 405,406 D / A converter 407,408 Audio signal output terminal 501 System management information detection means 901 Encoding method selection means

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Ryoji Suzuki             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. (72) Inventor Masatoshi Shinpo             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. F-term (reference) 5D044 AB05 DE02 DE15 DE43 DE72                       GK08                 5D045 DA20                 5K028 AA12 EE08 KK01 KK32 MM05                       SS01 SS04 SS05 SS24

Claims (3)

[Claims] 1. An audio data decoding means having at least one or more of the plurality of decoding methods for decoding each encoded audio stream encoded by a plurality of different encoding methods. , Stream ID described in the packet header in the multiplexed stream
And a system stream analyzing means for detecting and analyzing the encoding method of each audio stream in the multiplexed stream from a specific value associated with the encoding method described in the stream ID. And decoding at least one or more types of the audio streams. 2. An audio data decoding means having at least one or more of the above decoding methods among a plurality of decoding methods for decoding each encoded audio stream encoded by a plurality of different encoding methods. A system control means for processing the system management information of the recording medium, and described in the system management information,
Specific stream ID associated with the encoding method
According to the above, the reproducing apparatus is characterized in that the encoding system of each audio stream in the multiplexed stream is identified and at least one or more kinds of the audio streams are decoded. 3. A stream having the same input audio signal encoded by each of a plurality of different encoding systems, the encoded audio stream being multiplexed, and a stream having a specific value associated with the encoding system. A storage medium characterized by recording an ID together with a single medium.