JP2003132628A - Information recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately handle a multi-channel signal such as a multiplex audio signal. SOLUTION: By a 1st formatter (FRM), at least two channels of audio data are converted to an audio stream of a 1st format becoming a single stream. The audio stream of the converted 1st format is recorded by a 1st recorder (HDD). By a 2nd formatter (30), the audio stream of the 1st format recorded on the 1st recorder is converted to one stream for every channel to generate at least the 1st and 2nd audio streams, and a stream discriminator (sub-stream ID) is given to the 1st and 2nd audio streams corresponded to each channel to convert it to the audio stream of a 2nd format.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording / reproducing apparatus, and more particularly to an improved stream processing function.

[0002]

2. Description of the Related Art Recently, an optical disc (digital versatile disc: called DVD) capable of high density recording has been developed. Therefore, the DVD video standard that compresses video and processes the audio data by the linear PCM method is summarized. A medium on which data processed according to the DVD standard is recorded is called a DVD-ROM and is sold. In addition, the DVD recording standard (also called the real-time recording (RTR) standard) is also summarized, and DVD-R that can record once, DVD-RW that can repeatedly record and erase, and DVD-RAM are used as media for video data and audio. Some devices record data.

However, the above-mentioned DVD video standard (DVD-V
video) and DVD recording standard (DVD-RT
In R), mutual information cannot be reproduced due to compatibility problems.

As conventional examples relating to compatibility of the DVD video format, JP-A-11-45512, JP-A-11-31362, and JP-A-2000-2108 are available.
There is No. 9 publication.

However, the techniques described in these documents are
How to handle the voice multiplex signal (particularly the main voice and the sub voice) has not been examined in detail. For this reason, when reproduction is performed, a phenomenon occurs in which the main voice and the sub voice are simultaneously mixed and output from the left and right speakers. In order to prevent such a situation, some measures are taken to record one of the sounds.

For example, by using a digital video information recording / reproducing apparatus, a format based on a video recording standard for audio multiplex / bilingual broadcasting (first recording format)
When recording in, the audio information is recorded in dual monaural mode. At this time, when the recorded video / audio data is converted into a format based on the video standard (second recording format) and recorded, the audio information in the dual monaural mode is regarded as stereo audio and converted. From this, it is possible to generate video and audio data that complies with the video standard (second recording format), but in order to convert it as stereo audio, the audio multiplex (sound multiple) switching function of the player is used. There is a problem that it becomes impossible to use.

[0007]

SUMMARY OF THE INVENTION As described above, conventionally,
For audio multiplex signals, the format based on the video standard and the format based on the video recording standard are
It is not specified to be compatible with each other.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an information recording / reproducing apparatus capable of accurately handling a voice multiplex signal.

[0009]

In order to achieve the above object, the present invention provides a first formatter for converting audio data of at least two channels into an audio stream of a first format which becomes a single stream. A first recording device that records the converted audio stream of the first format, and one audio stream of the first format recorded on the first recording device, one stream for each channel To generate at least first and second audio streams, give a stream identifier to the first and second audio streams corresponding to each channel, and convert to an audio stream of the first format. It has two formatters.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

First, a general structure of an information recording / reproducing apparatus to which the present invention is applied will be schematically described.

FIG. 1 is a diagram showing an embodiment of a recording / reproducing apparatus to which the present invention is applied. Although this embodiment shows a recording / reproducing apparatus capable of handling both a DVD-RAM and a hard disk as a recording medium, the present invention is also applicable to an apparatus handling only one recording medium. is there. Hard disk or DVD
-RAM may be replaced by a storage medium of semiconductor memory.

The respective blocks shown in FIG. 1 are roughly divided into main blocks of the recording section on the left side and main blocks of the reproducing section on the right side.

This information recording / reproducing apparatus includes a hard disk drive (HDD) 2002 for reading / writing information from / to a hard disk 2001 and a disk drive 1002 for reading / writing information from / to an optical disk 1001 which is a medium capable of constructing a video file. And a data processor 1003 capable of supplying recording data to the hard disk drive 2002 and the disk drive 1002 and receiving a reproduced signal. The data processor 1003 handles data in recording or reproduction units, and includes a buffer circuit, a modulation / demodulation circuit, an error correction unit, and the like. A buffer memory 1004 for temporarily storing data to be recorded or reproduced is connected to the data processor 1003.

Further, the recording / reproducing apparatus has an encoder section 50 constituting a recording side and a decoder section 60 constituting a reproducing side.
And a microcomputer block 30 that controls the operation of the apparatus main body.

The encoder unit 50 has a video and audio analog-digital converter ADC for digitizing the input analog video signal and the input analog audio signal, a video encoder VE, and an audio encoder AE. Furthermore, it also includes a sub-picture encoder SP-E. In addition, a formatter FRM that converts the output of each encoder into a predetermined DVD-RAM format
And a buffer memory. Encoder section 50
An external analog video signal and an external analog audio signal from the AV input unit 41, or an analog video signal and an analog audio signal from the TV (television) tuner 42 are input to the.

When the digital video signal or digital audio signal is directly input, the encoder section 50 can directly supply the digital video signal or digital audio signal to the formatter. Further, each video data and audio data can be supplied to the video processing unit V-PRO of the decoder unit 60 and an audio selector (not shown). This system can be used to obtain a monitor output.

In the video encoder, the digital video signal is converted into a digital video signal compressed at a variable bit rate based on the MPEG2 or MPEG1 standard. Digital audio signals are MPEG or AC
It is converted into a digital audio signal compressed at a fixed bit rate or a linear PCM digital audio signal based on the -3 standard.

When the sub-picture information is input from the AV input section 42 (for example, a signal from a DVD video player with an independent output terminal for the sub-picture signal), or a DVD video signal having such a data structure is broadcast, which is broadcast. When received by the TV tuner 42, the sub-picture signal in the DVD video signal is encoded (run-length compressed) by the sub-picture encoder SP-E and becomes a sub-picture bitmap.

The encoded digital video signal, digital audio signal and sub-picture data are
It is packed in FRM and becomes a video pack, audio pack, and sub-picture pack. Furthermore, these are aggregated and constructed as a video object unit, and this video object unit is aggregated and managed as a video object. That is, it is converted into a format specified by the DVD recording standard (for example, the standard of DVD-RAM, DVD-RW, etc.).

In this apparatus, the hard disk drive 20 receives information (packets of video, audio, sub-picture data, etc.) encoded by the encoder 50 and created management information via the data processor 1003.
02, and can be recorded on the hard disk. Further, the information recorded in the hard disk can be recorded in the optical disk 1001 via the data processor unit 1003 and the disk drive 1002. This is because the information recorded on the hard disk is almost the same as the data format of the optical disc 1001.

Here, when the specific information (for example, the audio multiplex signal) is recorded in the hard disk in one stream, the apparatus of the present invention executes the format conversion processing for converting this into two streams, for example. You can This conversion process will be described in detail later.

Furthermore, the information encoded by the encoder unit 50 and the created management information can be directly recorded on the optical disc 1001 via the data processor unit 1003 and the disc drive 1002.
Furthermore, the optical disc 1001 and the hard disc 20
It is also possible to delete (file or video object) recorded in 01.

It is also possible to carry out an editing process in which video objects of a plurality of programs recorded on the hard disk 2001 or the optical disc 1001 are partially deleted or objects of different programs are connected. this is,
This is because the data unit (described later) handled by the format according to the present invention is defined to facilitate editing.

The disc drive 1002 has a rotation control system for the optical disc 1001, a laser drive system, an optical system and the like.

The microcomputer block 30 includes M
PU (Micro Processing Unit) or CPU
It includes a (central processing unit), a ROM in which a control program and the like are written, and a RAM for providing a work area necessary for executing the program.

MP of the microcomputer block 30
U follows the control program stored in the ROM,
Using the RAM as a work area, defect location detection, unrecorded area detection, recording information recording position setting, UDF recording, A
V address setting etc. is executed.

Further, the microcomputer block 30
Has an information processing unit required to control the entire system, including work RAM, directory processing unit, and VMG.
A (total video management information) processing unit, a packet header processing unit, a sequence header processing unit, a format conversion processing unit, and the like are provided.

Among the execution results of the MPU, the contents to be notified to the user are displayed on the display unit 43 of the DVD video recorder or OSD (on-screen display) on the monitor display. Further, the microcomputer block 30 has an operation unit (which may be a remote controller) 44 which gives an operation signal for operating this apparatus.

The microcomputer block 30
However, the disk drive 1002 and the data processor 10
03, the timing of controlling the encoder unit 50 and / or the decoder unit 60 and the like can be executed based on the time data from the STC 31. The recording and reproducing operations are normally executed in synchronization with the time clock from the STC 31, but other processing may be executed at a timing independent of the STC 31.

The decoder unit 60 is a DV having a pack structure.
Separator SEP that separates and extracts each pack from the D format signal, memory used when performing pack separation and other signal processing, and V decoder VD that decodes the main video data (contents of video pack) separated by the separator And an SP decoder SP-D that decodes the sub-picture data (contents of the sub-picture pack) separated by the separator,
It has an A decoder AD for decoding the audio data (contents of the audio pack) separated by the separator.

In addition, a video processor V-PRO is provided which synthesizes the decoded main video data with the decoded sub video data as appropriate, and superimposes a menu, highlight button, subtitles and other sub videos on the main video and outputs them. There is.

The output video signal of the decoder section 60 is digital-analog converted and is output to the TV output section. The output audio signal of the decoder unit 60 is digital-analog converted via a selector (not shown) and is output to the audio output unit.

The formatter FRM of the encoder section 50
Then, during recording, each segmentation information is created and periodically sent to the MPU of the microcomputer block 30 (GOP
Information such as at the time of the first interrupt). As the isolation information,
The number of VOBU packs, the end address of the I picture from the beginning of the VOBU, the playback time of the VOBU, and the like.

The MPU can also create various management information for video / audio reproduction. At the time of reproduction, each decoder executes initial setting, reproduction processing, etc. based on this management information information.

Here, in a real-time recording / reproducing apparatus using a DVD, a point to be noted is that, when accessing data, the reproduction is continued without interruption during the access (seek). Consecutive sectors are needed. This unit is called CDA (Contiguous Data Area). In other words, it is a data size that is agreed in advance to realize seamless reproduction.

It is advantageous that this CDA is in ECC (error correction code) block units. Therefore, the CDA size is set to a multiple of 16 sectors, and the file system records in this CDA unit. The data processor unit 1003 receives data in units of VOBU from the formatter of the encoder unit 50 and supplies data in units of CDA to the disk drive unit 1002. In addition, the MPU of the microcomputer block 30
Creates management information necessary for reproducing the recorded data, and when it recognizes a data recording end command, sends the created management information to the data processing unit 1003. As a result, the management information is recorded on the disc. Therefore, when the encoding is being performed, the MPU of the microcomputer block 30 receives the information in units of data (division information or the like) from the encoder unit 50. Further, the MPU of the microcomputer block 30 recognizes the management information (file system) read from the disc at the start of recording, recognizes the unrecorded area of the disc,
A data recording area is set on the disc via the data processor unit 1003.

The digital signal processor section 80 shown in FIG. 1 is a dedicated section for converting the format of a voice multiplex signal which will be described later. This part may be configured as dedicated hardware, but the function of this part may be realized by software in the microcomputer block 30.

The audio signal encoding processing system relating to the present invention, particularly the system according to the first format, will now be described. As audio signals in television broadcasting, there are types of monaural, stereo, and audio multiplex signals.

FIG. 2 shows an example in which the stereo signal and the audio multiplexed signal (multiplexed signal) are processed by the TV tuner 42. The multiplex signal is filtered (A1) for each carrier by the multiplex channel separation filter, and each is demodulated. Multiple signals are multiple signals, that is, the main voice (or L signal) and the sub-voice (R signal) are different carriers and FM.
It is modulated and transmitted. Therefore, each channel is separated by a filter, and each channel is FM-demodulated to obtain a main voice (or L signal) and a sub voice (R signal). Separated main channel signal (L
The channel signal) (A2) and the sub-channel signal (R channel signal) (A3) are subjected to analog-to-digital conversion processing on the encoder side (A4). Then, it is encoded by the audio encoder (A5).

The encoding process is performed by a system such as linear PCM, or MPEG which is a compression process, or AC3. The encoded audio information is packed, input to a multiplexer, and arranged, that is, formatted (A) in a predetermined unit together with other packs.
6). Other packs include a video pack, sub-picture pack, control data pack (RDI), and the like. In this first format, the audio pack string is defined as one stream.

FIG. 3 briefly shows the relationship between the management information of the real-time DVD and the video object which is the content.

In FIG. 3, the video object (VOB) will be described first. VOB is VR_MOVIE. It is called a VRO file.
A video file has a hierarchical structure, and one file is composed of one or a plurality of VOBs (video objects), and one VOB is composed of one or a plurality of VOBUs (video object units). VOB
U is composed of a plurality of packs.

As a plurality of packs, as described in the explanation of FIG. 2, RDI packs as unit control information,
There are V (video) packs, A (audio) packs, and the like. There may be a sub-picture pack (SP pack).

The RDI pack is also called a real-time data information pack (RDI_PCK). This pack includes information indicating the start time at which the first field of the VOBU to which the pack belongs is reproduced, information indicating the recording time of the VOBU, manufacturer information (MNFI), and the like. It also includes display control information (DCI) and copy control information (CCI). The display control information indicates aspect ratio information, subtitle mode information, and film camera mode information. Copy control information (CCI)
Includes copy permission information (0, 0) or copy prohibition (copy prohibition permission) information (1, 1).

The V pack is obtained by compressing video data in the MPEG2 system, and is composed of a pack header, a packet header, and a video data section. In the A pack, audio data is, for example, linear PCM or MPEG,
Alternatively, it is processed by a method such as AC3 and is composed of a pack header, a packet header, and an audio data section.

The management information is the video manager (VM
G), and a program chain (PGC) that manages the data reproduction order is defined therein. A cell (Cell) is defined in the program chain (PGC), and video object information (VOBI) that is information of a video object (VOB) to be played back is defined in the cell (Cell). . PGC
Is a program chain information (PGCI) part. There are two types of PGCI, one is the original PGCI (ORG_PGC
I) and the other is a user-defined PGC table (UD_PGCIT).

In the VOBI, a time map (TMA
P) is described, and this TMAP can specify the VOBU that constitutes the VOB corresponding to the VOBI. The link from the cell to the VOBI is specified by the logical address. Further, the TMAP information is linked to the VOB and the VOBU based on the stream number of the VOB, the number of VOBUs in this VOB, the entry number for each VOBU, and the logical address to each target VOBU.

The unit control information (for example, navigation information or real-time data information) included in the real-time data information pack (RDI_PCK) is RDI general information (RDI_GI), display control information and copy control information (DCI_CC).
I), including manufacturer information (MNFI). RDI_GI
Is the presentation start time (VOBU_S_P) of the first video field of the VOBU to which this RDI belongs.
TM) and VOBU recording time (VOBU_REC_T). The display control information (DCI) consists of aspect ratio information: 4 bits, subtitle (caption) information: 2 bits, reservation: 1 bit, film camera mode: 1 bit.

The copy control information CCI includes copy generation management system (CGMS) information (2 bits). When this information is 00, it indicates that copying is permitted, and when this information is 11, copying is prohibited (non-permitted).

The column indicated by the symbol a in FIG. 4 shows a sample sequence of, for example, a linear PCM when the audio packs formatted in the first recording format as shown in FIG. 3 are collected. In each sample column, a main channel sample, a sub channel sample, a main channel sample, ..., And a main channel sample and a sub channel sample are arranged. Then, this sample sequence is handled as one stream in the video recording standard (DVD-RAM recording). In the case of linear PCM audio, 80 or 160 samples are defined as audio frames, and audio frame group 0
.About.19 are defined as 1 GOF (1 group off frame), and this GOF forms an audio stream. Then, a sample of this audio stream is assigned to the audio pack.

In the above embodiment, when converting the first recording format into the second recording format,
The audio stream of a stream is converted into an audio stream of two streams. In this case, the sample sequence of the main channel is the first stream and the sample sequence of the sub-channel is the second stream. That is, it is converted into two streams as indicated by the symbol b in FIG.

FIG. 5 shows an example of a pack sequence in a VOBU containing audio information converted into the second recording format. That is, in FIG. 5, two streams indicated by reference numeral b in FIG.
It is shown as stored in the VOBU. RDI packs are arranged at the beginning of one VOBU, followed by a video pack,
Audio packs, sub-picture packs, etc. are arranged. It goes without saying that the audio pack may include packs of other streams.

Here, the audio packs are arranged in the VOBU sequence, and the first stream (main channel) and the second stream (sub channel) are identified by the sub stream ID. In Figure 5, V is the video pack, A
(Main) is the main channel stream, SP is the sub-picture pack, and A (sub) is the sub-channel stream. In this case, the pack of the newly generated new separate stream may be included.

FIG. 6 shows one audio pack extracted. Other video packs and sub-picture packs also have similar pack headers and packet headers. Here, the main contents of the packet header are shown.

A system clock reference is described in the pack header. The system clock reference is compared with the system clock in the device, and the comparison result is used as timing information when the information is handled in packs in the device. The packet header is present after the pack header, and then the audio data is present.

A packet start code is placed in the packet header. Next to this, the video stream,
A stream ID (in this case, an ID indicating audio) that is identification information of the audio stream and the sub-picture stream is described. Also, in the packet header,
PES (packet elementary stream) scrambling control information (basically indicating whether or not scrambling is applied) is arranged. Further, although not shown, other copyright information, information indicating whether it is an original or a copy, and the like can be arranged.

Furthermore, presentation time information (time stamp) for synchronously outputting the reproduction output between the related streams (video, audio, sub-picture) is described.

An area for providing a stuffing bite is also secured to maintain the pack length at a predetermined length. Next, the substream ID is described. This substream ID is an ID for identifying whether this pack is the main channel pack or the sub channel pack described above. By providing the substream ID of this, it is possible to identify two streams.

That is, the present invention has the first formatter (FRM) for converting the audio data of at least two channels into the audio stream of the first format which becomes a single stream. Also, a first recording device (HDD) for recording the converted audio stream of the first format.
Have. Then, the audio stream of the first format recorded in the first recording device is converted into one stream for each channel, at least first and second audio streams are generated, and each channel is supported. The second formatter (30) is provided for giving a stream identifier (substream ID) to the first and second audio streams and converting the audio stream of the second format.

FIG. 7 schematically shows the basic idea of the present invention. When the audio signal is analog, it is input to the first recording format generation section 203 via the analog conversion section 201 and the switch 202. When the audio signal is digital, it is input to the first recording format generation unit 203 via the switch 202. The processing here corresponds to the processing in the multiplexer (A6) as described in FIG.

The record information of the first format is recorded on the hard disk 2001, for example. Next, when the information recorded on the hard disk 2001 is converted into the second format and recorded on the optical disc 1001, the following processing is performed. In this process, the digital audio information is input to the digital audio processor 301. This digital audio processor 301
Receives the audio stream in the first recording format as described in FIG. Then, when the management information indicates a mode having a main channel and a sub channel, the main channel pack and the sub channel pack are separately supplied to the second recording format generation unit 302. Furthermore, in the second recording format generation unit 302,
A stream of the audio data pack of the main channel and a stream of the audio data pack of the sub channel are generated (see symbol b in FIG. 4), mixed with other packs as shown in FIG. 5 to generate VOBU, and Is recorded on the optical disc 1001.

In this case, the second recording format generator 302 adds a substream ID for identifying each stream, as described in FIG.

By the above processing, the reproducing apparatus which identifies the substream ID and processes the audio multiplex signal can accurately obtain the output switching between the main audio and the sub audio. The original stream may be left as the third stream. In this case, the synthesized voice of the main voice and the sub voice can be heard, and the main voice can be output to the L channel and the sub voice of the R channel can be output.

That is, the above-mentioned device converts the input at least audio data into a first format of one stream format composed of M channels and records it in a first recording section, Format conversion means for reading the data of the first format, separating it into N streams, and converting it into a second format in which an identifier is added to each stream, and a stream obtained from the format conversion means as a second recording Means for recording in a section.

The present invention is not limited to the above embodiment. In the above-mentioned embodiment, when converting the first recording format into the second recording format, two streams for main audio and sub audio are generated.
Not limited to this, for example, a stream for 6 channels may be generated. In this case, for example, in the audio data for the left and right channels (first stream), × 0.3, other 4
One channel (second stream) may be multiplied by a coefficient of × 0.7 and combined to generate new audio data. This processing results in a stream including each channel of surround sound data, for example. Or, the audio data of 2 channels from the beginning is 6
The audio data may be formed as channel audio data, and the audio data of 6 channels may be identified as separate streams (6 streams). When converting 2-channel audio data into 6-channel audio data, the 2-channel audio data is multiplied by an appropriate coefficient according to each channel to generate the data of each channel. When the stereo audio (L, R) channel data is further divided into a plurality of channels, the coefficient applied to the audio data of the left and right channels is adjusted according to the rear left and rear right.

The present invention is not limited to the above embodiment. The above embodiment is effective, for example, when processing audio data by the linear PCM method. However, regarding the handling of audio data, the DVD standard also supports AC3, MPEG, etc. Therefore, further, in the first recording format generation unit, AC3, MPEG
It is also possible to process audio data compressed by a method or the like.

FIG. 8 shows a basic structure of a format conversion device applied to a device capable of handling compressed data and uncompressed data of audio data. The same parts as those in FIG. In this embodiment, the switch 202 can also select the compressed audio data from the encoder 211. In addition, the switch 202 selectively introduces the uncompressed audio data from the analog-digital conversion unit 201 or the digital audio data directly given from the outside to the first recording format generation unit 203 as described above. You can

This first recording format generation section 203
The processing in the multiplexer (A
Corresponds to the processing in 6). The record information of the first format is recorded on the hard disk 2001, for example.

Next, when the information recorded on the hard disk 2001 is converted into the second format and recorded on the optical disc 1001, the following processing is performed. In this process, the digital audio information is first input to the discriminator 311, and whether this digital audio information is audio data compressed by AC3, MPEG method or the like, and whether it is uncompressed digital audio data (linear PCM). It is determined whether there is any.
This determination can be made from the content of the audio stream ID.

When the digital audio information is compressed data, the digital audio information is encoded by the audio encoder 312 and becomes uncompressed digital audio data, and the digital audio processor 30.
Input to 1. In the case of uncompressed digital audio data, the output of the discriminator 311 is directly input to the digital audio processor 301.

The processing in this digital audio processor 301 is the same as the processing described above. That is, the audio stream of the first recording format is received as described in FIG. Then, when the management information indicates a mode having a main channel and a sub channel, the main channel pack and the sub channel pack are separately supplied to the second recording format generation unit 302. The second recording format generation unit 302 generates a stream of the audio data pack of the main channel and a stream of the audio data pack of the sub-channel (see reference numeral b in FIG. 4), and as shown in FIG. Mixed with VO
BU is generated and recorded on the optical disc 1001. Also in this case, the second recording format generation unit 302 adds a substream ID for identifying each stream, as described in FIG.

The present invention is not limited to the above embodiment. Even when recording on the optical disc 1001, the recording may be performed so as to support the AC3, MPEG system, or the like.

In FIG. 9, the same parts as those in FIG. In this embodiment, the switch 2
02 can also select the compressed audio data from the encoder 211. In addition, the switch 202 is
As described above, the uncompressed audio data from the analog-digital conversion unit 201 or the digital audio data directly given from the outside can be selectively introduced into the first recording format generation unit 203.

This first recording format generation section 203
The processing in the multiplexer (A
Corresponds to the processing in 6). The record information of the first format is recorded on the hard disk 2001, for example.

Next, when the information recorded on the hard disk 2001 is converted into the second format and recorded on the optical disc 1001, the following processing is performed. In this process, the digital audio information is first input to the discriminator 311, and whether this digital audio information is audio data compressed by AC3, MPEG method or the like, and whether it is uncompressed digital audio data (linear PCM). It is determined whether there is any.
This determination can be made from the content of the audio stream ID.

When the digital audio information is compressed data, the digital audio information is encoded by the audio encoder 312 and becomes uncompressed digital audio data, which is processed by the digital audio processor 30.
Input to 1. In the case of uncompressed digital audio data, the output of the discriminator 311 is directly input to the digital audio processor 301.

The processing in this digital audio processor 301 is the same as the processing described above. That is, the audio stream of the first recording format is received as described in FIG. When the management information indicates a mode having a main channel and a sub channel, the main channel pack and the sub channel pack are separately supplied to the second recording format generation unit 302 (however, this processing Is the case where the audio data in the first recording format era is uncompressed audio data). If the audio data in the first recording format era is compressed audio data, the audio data of each pack is input to the audio encoder 313. The audio encoder 313 converts the uncompressed audio data into audio data compressed by AC3, MPEG, etc., packs it again, and supplies it to the second recording format generation unit 302. The switch group 314 is for switching between the case where the pack of uncompressed audio data from the digital audio processor 301 is directly supplied to the second recording format generation unit 302 and the case where it is supplied to the audio encoder 313.

The second recording format generating section 302 generates a stream of audio data packs of the main channel and a stream of audio data packs of the sub-channel (see reference numeral b in FIG. 4), and as shown in FIG. A VOBU is generated by mixing with another pack, and this is recorded on the optical disc 1001. Also in this case, the second recording format generation unit 302 adds a substream ID for identifying each stream, as described in FIG.

The above embodiment is different from the previous embodiment in that the format conversion means further determines whether the data of the first format is compressed data or uncompressed data. If the data is compressed data, the means for decoding the compressed data and the means for converting the output from the decoding means into the second format are provided.

The present invention is not limited to the above embodiment.

FIG. 10 shows another embodiment of the present invention. In this embodiment, channel separation is performed first and recorded on the hard disk. That is, either the output of the analog-digital conversion unit 201 or the direct digital input is selected by the switch 202 and input to the digital audio processing unit 411. Here, each audio data is separated. Here, as in each of the above-described embodiments, the audio data has a plurality of channels (for example, 5 channels).
Channel), the audio data of the first channel (stream) is multiplied by a coefficient of × 0.3, and the other four channels (stream) are multiplied by a coefficient of × 0.7 to synthesize them. , New audio data may be generated and further used as another stream. Then, in the first recording format generation unit 203a, each audio data is organized into each stream (a stream as described in FIG. 4), for example, V
It is stored in the OBU and recorded on the hard disk 2001. Here, it is not always necessary to convert to the VOBU format.

Next, when the data read from the hard disk 2001 is to be an optical disk (DVD-R), for example, the read data is input to the second recording format generation section 302a. The second recording format generation unit 302a creates a format and management information corresponding to the recording medium and records it on the optical disc 1001.

FIG. 11 shows another embodiment of the present invention. For example, assume that the optical disc 1001a is a DVD-RW. In this case, an audio encoder 511 is added between the digital audio processor 411 and the first recording format generation unit 203a as compared with the embodiment of FIG. As a result, compressed audio data can be recorded on the optical disc 1001. The other parts are the same as in the previous embodiment.

The switches shown in FIG. 7 to FIG.
The first recording format generation unit, the second recording format generation unit, the digital audio processing unit, etc. may be configured as hardware, or may be a digital signal processor (DS).
P) or may be realized by software.

The present invention is not limited to the above embodiment. Information of one stream containing audio data of at least two channels is input, means for increasing this information into at least two streams, and means for formatting data of at least two streams and recording it on a recording medium. Is also within the scope of this invention. The means for recording on the recording medium may include means for recording the prepared menu information in association with each stream. The menu information is that the two streams are audio multiplex signals, or types such as stereo signals or multichannel signals, and recording date. Then, in the reproducing apparatus, this menu information may be displayed on the display. In this case, as shown in FIG. 1, for example, the menu information processing unit operates and records data prepared in advance in the menu recording unit in the menu information area of the disc.

The reproducing apparatus reads the above menu information in the menu display mode during data reproduction,
The type of audio signal can be displayed. Further, when the type of the audio signal is displayed, the user operation method such as stream selection and channel selection may be displayed in an easily understandable manner.

[0088]

According to the present invention described above, it is possible to provide an information recording / reproducing apparatus capable of accurately handling a multi-channel signal such as a voice multiplex signal.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration example of an information recording / reproducing apparatus to which the present invention is applied.

FIG. 2 is an explanatory diagram showing an example of a processing path of a voice multiplexed signal.

FIG. 3 is an explanatory diagram shown for explaining a part of the data structure in the DVD video standard for recording and reproduction.

FIG. 4 is a first recording format and a second recording format according to the present invention.
Audio channel (data) in the recording format of
Explanatory diagram showing an example of the stream.

FIG. 5 is an explanatory diagram showing a relationship between a second recording format and a packet string of the DVD video standard for recording and reproduction.

FIG. 6 is an explanatory diagram of a data structure of an audio pack according to the present invention.

FIG. 7 is a diagram showing a block of a basic concept of the present invention.

FIG. 8 is a diagram showing another embodiment of the present invention.

FIG. 9 is a diagram showing still another embodiment of the present invention.

FIG. 10 is a view showing still another embodiment of the present invention.

FIG. 11 is a view showing still another embodiment of the present invention.

[Explanation of symbols]

30 ... Microcomputer block, 50 ... Decoder section, 60 ... Encoder section, 1001 ... Optical disk, 10
02 ... disk drive, 1003 ... data processor, 2001 ... hard disk, 2002 ... hard disk drive.

Continued front page    (72) Inventor Ken Kumagai             70 Yanagicho, Saiwai-ku, Kawasaki City, Kanagawa Prefecture             Toshiba Yanagimachi Office (72) Inventor Hiroaki Unno             70 Yanagicho, Saiwai-ku, Kawasaki City, Kanagawa Prefecture             Toshiba Yanagimachi Office F-term (reference) 5C052 AA02 AB09 CC11 DD04                 5C053 FA23 FA25 GA11 GB06 GB11                       GB15 GB37 JA07 JA23 KA24                 5D044 BC01 BC04 DE48 EF05 HL07

Claims (11)

[Claims] 1. Audio data of at least two channels,
A first formatter for converting the first format audio stream into a single stream, a first recording device for recording the converted first format audio stream, and the first recording device The recorded audio stream of the first format is converted into one stream for each channel, at least first and second audio streams are generated, and the first and second audio streams corresponding to each channel are generated. Give a stream identifier to the audio stream,
An information recording / reproducing apparatus, comprising: a second formatter for converting into an audio stream in a format of 2. 2. A second recording device is further provided, and the second recording device is provided.
2. The information recording / reproducing apparatus according to claim 1, wherein the audio stream of the format is recorded on a disc on which information is recorded by the second recording apparatus. 3. The first formatter is further connected to an encoding unit that encodes the audio data of the at least two channels when converting the audio data of the at least two channels into the first format. Information recording / reproducing apparatus described. 4. The second formatter includes a determining unit that determines whether the audio data of the first format is compressed data or uncompressed data, and the audio data is compressed data. The information recording / reproducing apparatus according to claim 1, wherein a decoding means for decoding the compressed data is connected to, and an output from the decoding means is converted by the second formatter. 5. The audio data of at least two left and right channels included in a single stream, for each channel,
Generate at least a first and a second audio stream,
By giving a stream identifier to the first and second audio streams corresponding to each channel, the first and second audio streams are given.
A first formatter for converting the audio data of the audio stream of the above into an audio stream of a first format, and a first recording device for recording the converted audio stream of the first format on a recording medium. An information recording / reproducing apparatus characterized by: 6. The information recording / reproducing apparatus according to claim 5, further comprising an encoder that encodes the first and second audio streams. 7. A first formatter for converting at least two-channel audio data into an audio stream of a first format that becomes a single stream, and a first formatter for converting the converted audio stream of the first format. A first recording device for recording in a recording unit, the audio stream of the first format recorded in the first recording device is converted into one stream for each channel, and at least first and second Of the first audio stream and the second audio stream corresponding to each channel are given stream identifiers,
A second formatter for converting the second format audio stream into a second format audio stream; and a second recording device for recording the second format audio stream obtained from the second formatter in a second recording unit. An information recording / reproducing apparatus characterized by: 8. The first and second recording devices are the same device, and are devices for recording the audio streams of the first and second formats in different areas on the same recording medium. The information recording / reproducing apparatus according to claim 7, characterized in that: 9. The first and second recording devices are different devices, and record the audio streams of the first and second formats on different recording media, respectively. Information recording / reproducing apparatus. 10. Information of one stream containing audio data of at least two channels is input, stream increasing means for increasing this information into at least two streams, and data of the two streams are formatted to obtain respective streams. An information recording / reproducing apparatus comprising: a recording unit for adding a stream identifier to the recording medium and recording the recording medium on a recording medium. 11. The menu information recording means records the prepared menu information in a menu information recording area of the recording medium in association with each stream in order to obtain the identification display of the increased stream. The information recording / reproducing apparatus according to claim 10, characterized by comprising.