JP2004355806A - Information recording and reproducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To handle exactly a multi-channel signal such as a voice multiplex signal. <P>SOLUTION: A first formatter (FRM) converts voice data of at least two channels to a voice stream of the first format being a single stream. A first recording device (HDD) records the converted voice stream of the first format. A second formatter (30) converts the voice stream of the first format recorded in the first recording device to one stream for each channel, generates at least the first and the second voice streams, gives a stream identifier (sub-stream ID) to the first and the second voice streams corresponding to respective channels, and converts it to the voice stream of the second format. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an information recording / reproducing apparatus, and particularly to an improved stream processing function.

  In recent years, optical discs (digital versatile discs: referred to as DVDs) capable of high-density recording have been developed. Therefore, a DVD video standard for compressing video data and processing audio data by a linear PCM method has been put together. A medium on which data processed based on the DVD standard is recorded is called a DVD-ROM and is sold. In addition, DVD recording standards (also called real-time recording (RTR) standards) are summarized, and DVD-R that can be recorded once, DVD-RW that can be repeatedly recorded and erased, and video data and audio using DVD-RAM as media. Some devices record data.

  However, the DVD-Video standard (DVD-Video) and the DVD recording standard (DVD-RTR) cannot mutually reproduce information due to compatibility problems.

  Conventional examples of DVD video format compatibility include JP-A-11-45512, JP-A-11-31362, and JP-A-2000-21089.

  However, the techniques described in these documents do not consider in detail how to handle audio multiplexed signals (particularly, main audio and sub audio). Therefore, when reproduction is performed, a phenomenon occurs in which the main sound and the sub sound are simultaneously mixed and output from the left and right speakers. In order to prevent such a situation, a measure has been taken to record either one of the sounds.

For example, when a digital video information recording / reproducing apparatus is used to record audio multiplexed / bilingual broadcasting in a format (first recording format) based on a video recording standard, audio information is recorded in a dual monaural mode. At this time, when converting the recorded video / audio data into a format based on the video standard (second recording format) and recording, 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 conforming to the video standard (second recording format). There is a problem that it becomes impossible to use.
JP-A-2002-298556 JP-A-10-21673

  As described above, the format based on the video standard and the format based on the video recording standard for the audio multiplex signal have not been defined so as to be mutually compatible.

  Accordingly, it is an object of the present invention to provide an information recording / reproducing apparatus capable of correctly handling an audio multiplex signal.

  In order to achieve the above object, the present invention provides an audio encoder for compressing and encoding input audio data, and packetizing and mixing video data and compressed audio data of a plurality of channels into one stream in a first format. A first formatter for conversion, a first recording device for recording the converted one stream of the first format on a recording medium, and reproducing one stream of the recording medium to decode the encoded audio data An audio decoder; and means for separating a plurality of channels of the audio signal decoded by the audio decoder and supplying each of the channels to a second formatter to obtain an audio stream in a second format.

  By the above-mentioned means, it is possible to compress and record at the time of primary recording and use the recording medium effectively, and at the time of secondary recording, to make the format effective on the reproducing side.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  First, an overall configuration 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 is described as 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 which handles only one of the recording media. is there. The hard disk or DVD-RAM may be replaced with a storage medium using a semiconductor memory.

  When each block in FIG. 1 is roughly divided, the main block of the recording unit is shown on the left side, and the main block of the reproducing unit is shown on the right side.

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

  The recording / reproducing apparatus mainly includes an encoder unit 50 constituting the recording side, a decoder unit 60 constituting the reproducing side, and a microcomputer block 30 for controlling the operation of the apparatus main body.

  The encoder unit 50 includes a video and audio analog-to-digital converter ADC for digitizing the input analog video signal and the input analog audio signal, a video encoder V-E, and an audio encoder A-E. Furthermore, it also includes the sub-picture encoder SP-E. Further, a formatter FRM for converting the output of each encoder into a predetermined DVD-RAM format and a buffer memory are provided. 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 a TV (television) tuner 42 are input to the encoder unit 50.

  When a digital video signal or a digital audio signal is directly input, the encoder unit 50 can directly supply the digital video signal or the digital audio signal to the formatter. Also, each video data and audio data can be supplied to the video processing unit V-PRO and the audio selector (not shown) of the decoder unit 60. 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. The digital audio signal is converted into a digital audio signal compressed at a fixed bit rate or a digital audio signal of linear PCM based on the MPEG or AC-3 standard.

  When the sub-picture information is input from the AV input unit 42 (for example, a signal from a DVD video player with an independent output terminal for a sub-picture signal), or a DVD video signal having such a data structure is broadcast, and the broadcast is transmitted to 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 to be a bit map of the sub-picture.

  The encoded digital video signal, digital audio signal, and sub-picture data are packed in a formatter FRM to become a video pack, an audio pack, and a sub-picture pack. Further, these are aggregated and constructed as a video object unit, and the video object units are aggregated and managed as a video object. In other words, the data is converted into a format specified by the DVD recording standard (for example, a standard such as DVD-RAM and DVD-RW).

  Here, the present apparatus supplies the information (packs of video, audio, sub-picture data, etc.) encoded by the encoder unit 50 and the created management information to the hard disk drive 2002 via the data processor 1003, and sends the information to the hard disk. Can be recorded. Information recorded on the hard disk can also be recorded on 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 substantially the same as the data format of the optical disk 1001.

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

  Furthermore, the information encoded by the encoder unit 50 and the created management information can be directly recorded on the optical disk 1001 via the data processor unit 1003 and the disk drive 1002. Furthermore, files (video objects) recorded on the optical disk 1001 and the hard disk 2001 can also be deleted.

  In addition, editing processing for partially deleting video objects of a plurality of programs recorded on the hard disk 2001 or the optical disk 1001 or connecting objects of different programs can be performed. This is because a data unit (described later) handled by the format according to the present invention is defined to facilitate editing.

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

  The microcomputer block 30 includes an MPU (microprocessing unit) or CPU (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. .

  The MPU of the microcomputer block 30 executes defect location detection, unrecorded area detection, recording information recording position setting, UDF recording, AV address setting, etc. using the RAM as a work area according to the control program stored in the ROM. I do.

  The microcomputer block 30 has an information processing unit necessary for controlling the entire system, and includes a work RAM, a directory processing unit, a VMG (whole video management information) processing unit, a packet header processing unit, a sequence header. A processing unit, a format conversion processing unit, and the like.

  Of 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 displayed on the monitor display by OSD (on-screen display). Further, the microcomputer block 30 has an operation unit (may be a remote controller) 44 for giving an operation signal for operating this device.

  The timing at which the microcomputer block 30 controls the disk drive 1002, the data processor 1003, the encoder unit 50 and / or the decoder unit 60, and the like can be executed based on time data from the STC 31. The recording and playback operations are normally performed in synchronization with the time clock from the STC 31, but other processing may be performed at a timing independent of the STC 31.

  The decoder unit 60 includes a separator SEP for separating and extracting each pack from a DVD format signal having a pack structure, a memory used for performing pack separation and other signal processing, and main video data (video packs) separated by the separator. Decoder VD that decodes sub-picture data (contents of sub-picture packs), SP decoder SP-D that decodes sub-picture data (contents of sub-picture packs), and audio data (contents of audio packs) that are separated by separators. It has an A decoder AD for decoding.

  In addition, a video processor V-PRO is provided which appropriately combines decoded main image data with decoded sub-image data, and outputs a menu, a highlight button, subtitles and other sub-images superimposed on the main image.

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

  Note that the formatter FRM of the encoder unit 50 creates each segmentation information during recording, and periodically sends it to the MPU of the microcomputer block 30 (information at the time of interruption of the GOP head). The segmentation information includes the number of VOBU packs, the end address of the I picture from the beginning of the VOBU, the VOBU playback time, and the like.

  The MPU can also create various types of management information for video / audio reproduction. At the time of reproduction, each decoder performs initialization, reproduction processing, and the like based on the management information information.

  Here, in a real-time recording / reproducing apparatus using a DVD, a point to be noted is that, when accessing data, at least continuous sectors are required to continue reproduction without interruption during the access (seek). Is needed. This unit is called CDA (Contiguous Data Area). That is, the data size is predetermined in order to realize seamless reproduction.

  This CDA is more advantageously in units of ECC (error correction code) blocks. For this reason, the CDA size is set to a multiple of 16 sectors, and recording is performed in CDA units in the file system. The data processor unit 1003 receives the data in VOBU units from the formatter of the encoder unit 50 and supplies the data in CDA units to the disk drive unit 1002. The MPU of the microcomputer block 30 creates management information necessary for reproducing the recorded data, and when recognizing a data recording end command, sends the created management information to the data processing unit 1003. Thus, the management information is recorded on the disc. Therefore, when encoding is being performed, the MPU of the microcomputer block 30 receives data unit information (such as segmentation information) from the encoder unit 50. At the start of recording, the MPU of the microcomputer block 30 recognizes the management information (file system) read from the disk, recognizes the unrecorded area of the disk, and changes the data recording area to the disk via the data processor unit 1003. Is set to

  The digital signal processor section 80 shown in FIG. 1 is a dedicated section for performing format conversion of an audio multiplex signal 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.

  Here, an audio signal encoding processing system related to the present invention, particularly a system according to the first format will be described. Audio signals in television broadcasting include monaural, stereo, and audio multiplexed signal types.

  FIG. 2 shows an example in which a stereo signal and an audio multiplex signal (multiplex signal) are processed by the TV tuner 42. The multiplex signal is filtered (A1) for each carrier by a multiplex channel separation filter, and each is demodulated. In the multiplex signal, a plurality of signals, that is, a main sound (or an L signal) and a sub sound (an R signal) are FM-modulated by different carriers and transmitted. For this purpose, a main audio (or L signal) and a sub audio (R signal) can be obtained by separating each channel with a filter and performing FM demodulation on each channel. The separated main channel signal (L channel signal) (A2) and 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 method such as linear PCM or MPEG which is a compression process, or AC3. The encoded audio information is packed, input to the multiplexer, and arranged in a predetermined unit along with other packs, that is, formatted (A6). Other packs include a video pack, a sub-picture pack, a control data pack (RDI), and the like. In the first format, the audio pack sequence is defined as one stream.

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

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

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

  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 VOBU belongs is reproduced, information indicating the recording time of the VOBU, manufacturer information (MNFI), and the like. Also, it 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. The copy control information (CCI) includes copy permission information (0, 0) or copy prohibition (copy rejection permission) information (1, 1).

  The V pack is obtained by compressing video data according to the MPEG2 system and includes a pack header, a packet header, and a video data part. The A-pack is obtained by processing audio data by, for example, a system such as linear PCM, MPEG, or AC3, and includes a pack header, a packet header, and an audio data part.

  The management information is called a video manager (VMG), in which a program chain (PGC) for managing the data reproduction order is defined. In the program chain (PGC), a cell (Cell) is defined, and in the cell (Cell), video object information (VOBI) which is information of a video object (VOB) to be reproduced is defined. . The part where the specific information of the PGC is recorded is the program chain information (PGCI) part. There are two types of PGCI, one is an original PGCI (ORG_PGCI) and the other is a user-defined PGC table (UD_PGCIT).

  A time map (TMAP) is described in the VOBI, and the TMAP can specify a VOBU constituting a VOB corresponding to the VOBI. The link from the cell to the VOBI is specified by a logical address. The link from the TMAP information to the VOB and the VOBU is made based on the stream number of the VOB, the number of VOBUs in the VOB, the entry number for each VOBU, and the logical address to each target VOBU.

  The unit control information (for example, referred to as navigation information or real-time data information) included in the above-described real-time data information pack (RDI_PCK) includes RDI general information (RDI_GI), display control information and copy control information (DCI_CCI), and a manufacturer. Information (MNFI). RDI_GI includes the presentation start time (VOBU_S_PTM) and VOBU recording time (VOBU_REC_T) of the first video field of the VOBU to which this RDI belongs. The display control information (DCI) includes aspect ratio information: 4 bits, subtitle (caption) information: 2 bits, reservation: 1 bit, and film camera mode: 1 bit.

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

  The column denoted by reference numeral a in FIG. 4 indicates, for example, a sample column of linear PCM when audio packs formatted in the first recording format are aggregated as shown in FIG. In each sample sequence, the samples of the main channel and the sub-channel are arranged like a sample of the main channel, a sample of the sub-channel, a sample of the main channel, and so on. This sample sequence is handled as one stream in the video recording standard (recording on DVD-RAM). In the case of linear PCM audio, 80 or 160 samples are defined as audio frames, and audio frame groups 0 to 19 are defined as 1 GOF (one group off frame), and this GOF forms an audio stream. Then, samples of this audio stream are assigned to audio packs.

  In the above embodiment, when the first recording format is converted to the second recording format, the above-mentioned one stream audio stream is converted into two stream audio streams. In this case, the sample sequence of the main channel is a first stream, and the sample sequence of the sub-channel is a second stream. That is, the stream is converted into two streams as indicated by reference numeral b in FIG.

  FIG. 5 shows an example of a pack sequence in a VOBU including audio information converted into the second recording format. That is, FIG. 5 shows a state in which the two streams indicated by reference numeral b in FIG. 4 are stored in the video object unit VOBU together with other packs. At the beginning of one VOBU, RDI packs are arranged, followed by video packs, audio packs, sub-picture packs, and the like. It goes without saying that the audio pack may include a pack of another stream.

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

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

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

  A packet start code is arranged in the packet header. Next to this, a stream ID (in this case, an ID indicating audio) that is identification information of a video stream, an audio stream, and a sub-picture stream is described. In the packet header, PES (packet elementary stream) scrambling control information (which basically indicates whether or not scrambling is applied) is arranged. Although not shown, copyright information, information indicating whether the data is original or copied, and the like can be arranged.

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

  Also, an area for providing a stuffing byte to maintain the pack length at a predetermined length is secured. Next, a substream ID is described. The sub-stream ID is an ID for identifying whether this pack is the pack of the main channel or the pack of the sub-channel described above. By providing these sub-stream IDs, it is possible to identify two streams.

  That is, the present invention has a first formatter (FRM) for converting at least two channels of audio data into an audio stream of a first format that becomes a single stream. In addition, it has a first recording device (HDD) for recording the converted audio stream of the first format. Then, the audio stream of the first format recorded on the first recording device is converted into one stream for each channel, and at least first and second audio streams are generated, and each channel is generated. A second formatter (30) for giving a stream identifier (sub-stream ID) to the first and second audio streams and converting the stream into an audio stream of a second format.

  FIG. 7 schematically shows the basic concept of the present invention. When the audio signal is analog, the audio signal is input to the first recording format generation unit 203 via the analog conversion unit 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 recording 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 disk 1001, the following processing is performed. In this process, the digital audio information is input to the digital audio processor 301. The digital audio processor 301 receives the audio stream of the first recording format as described with reference to FIG. When the management information indicates a mode having a main channel and a sub-channel, the pack of the main channel and the pack of the sub-channel are separately supplied to the second recording format generation unit 302. Further, the second recording format generation unit 302 generates a stream of the main channel audio data pack and a stream of the sub channel audio data pack (see reference numeral “b” in FIG. 4), and as shown in FIG. A VOBU is generated by mixing with the pack, and is recorded on the optical disc 1001.

  In this case, as described in FIG. 6, the second recording format generation unit 302 adds a substream ID to identify each stream.

  By the above processing, the playback device that identifies the sub-stream ID and processes the audio multiplex signal can accurately switch the output between the main audio and the sub audio. The original stream may be left as the third stream. In this case, the user can listen to the synthesized voice of the main and sub-sounds, and can output the main sound to the L channel and the sub-sound of the R channel.

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

  The present invention is not limited to the above embodiment. In the above embodiment, when the first recording format is converted to the second recording format, two streams for the main audio and the sub audio are generated. However, the present invention is not limited to this. May be generated. In this case, for example, the audio data (the first stream) for the left and right channels is multiplied by a factor of × 0.3, and the other four channels (the second stream) are multiplied by a factor of × 0.7. Then, new audio data may be generated. In this process, for example, a stream including each channel of the surround sound data is obtained. Alternatively, audio data of two channels may be formed as audio data of six channels from the beginning, and the audio data of six channels may be identified as separate streams (six streams). When converting the audio data of two channels into the audio data of six channels, the data of each channel is generated by appropriately multiplying the audio data of two channels according to each channel. When the stereo audio (L, R) channel data is further divided into a plurality of channels, coefficients applied to the audio data of the left and right channels are 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 audio data is processed by the linear PCM method. However, the handling of audio data in the DVD standard also supports AC3, MPEG, and the like. Therefore, the first recording format generation unit can also process audio data compressed by AC3, MPEG, or the like.

  FIG. 8 shows a basic configuration of a format conversion device applied to a device that can handle compressed data and uncompressed data of audio data. The same parts as those in FIG. 7 are described with the same reference numerals. 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-to-digital conversion unit 201 or digital audio data directly supplied from the outside to the first recording format generation unit 203 as described above. Can be.

  The processing in the first recording format generation unit 203 corresponds to the processing in the multiplexer (A6) as described with reference to FIG. The recording 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 disk 1001, the following processing is performed. In this process, digital audio information is first input to a discriminator 311 to determine whether or not the digital audio information is audio data compressed by AC3, MPEG, or the like, and to uncompressed digital audio data (linear PCM). A determination is made whether there is. This determination can be made from the contents of the audio stream ID.

  If the digital audio information is compressed data, the digital audio information is encoded by the audio encoder 312 and input to the digital audio processor 301 as uncompressed digital audio data. 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 the digital audio processor 301 is the same as the processing described above. That is, as described in FIG. 4, the audio stream of the first recording format is received. When the management information indicates a mode having a main channel and a sub-channel, the pack of the main channel and the pack of the sub-channel are separately supplied to the second recording format generation unit 302. The second recording format generation unit 302 generates a main channel audio data pack stream and a sub channel audio data pack stream (see reference numeral “b” in FIG. 4), and as shown in FIG. To generate a VOBU, which is recorded on the optical disc 1001. Also in this case, as described in FIG. 6, the second recording format generation unit 302 adds a substream ID to identify each stream.

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

  In FIG. 9, the same portions 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-to-digital conversion unit 201 or digital audio data directly supplied from the outside to the first recording format generation unit 203 as described above. Can be.

  The processing in the first recording format generation unit 203 corresponds to the processing in the multiplexer (A6) as described with reference to FIG. The recording 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 disk 1001, the following processing is performed. In this process, digital audio information is first input to a discriminator 311 to determine whether or not the digital audio information is audio data compressed by AC3, MPEG, or the like, and to uncompressed digital audio data (linear PCM). A determination is made whether there is. This determination can be made from the contents of the audio stream ID.

  If the digital audio information is compressed data, the digital audio information is encoded by the audio encoder 312 and input to the digital audio processor 301 as uncompressed digital audio data. 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 the digital audio processor 301 is the same as the processing described above. That is, as described in FIG. 4, the audio stream of the first recording format is received. If the management information indicates a mode having a main channel and a sub-channel, the pack of the main channel and the pack of the sub-channel are separated and supplied to the second recording format generation unit 302 (however, this processing Is a case where the audio data of 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 non-compressed audio data into audio data compressed by AC3, MPEG, or the like, packs it again, and supplies it to the second recording format generation unit 302. The switch group 314 switches between a case where the pack of the uncompressed audio data from the digital audio processor 301 is directly supplied to the second recording format generation unit 302 and a case where the pack is supplied to the audio encoder 313.

  The second recording format generation unit 302 generates a main channel audio data pack stream and a sub channel audio data pack stream (see reference numeral “b” in FIG. 4), and as shown in FIG. To generate a VOBU, which is recorded on the optical disc 1001. Also in this case, as described in FIG. 6, the second recording format generation unit 302 adds a substream ID to identify each stream.

  The above embodiment is different from the above embodiment in that the format conversion means further comprises means for determining whether the data of the first format is compressed data or uncompressed data, Is compressed data, means for decoding the compressed data and 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 a hard disk. That is, either the output of the analog-to-digital converter 201 or the direct digital input is selected by the switch 202 and input to the digital audio processor 411. Here, each audio data is separated. Here, similarly to the above-described embodiments, when the audio data is a plurality of channels (for example, five channels), the audio data of the first channel (stream) includes × 0.3, and the other four channels The (stream) may be multiplied by a coefficient of 0.7 and combined to generate new audio data, which may be used as another stream. Then, the first recording format generation unit 203a organizes each audio data into each stream (the stream described with reference to FIG. 4), stores it in, for example, a VOBU, and records it on the hard disk 2001. Here, it is not always necessary to convert to a VOBU unit format.

  Next, when the data read from the hard disk 2001 is, for example, an optical disk (DVD-R), the read data is input to the second recording format generation unit 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, it is assumed 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. Thereby, it is possible to record the compressed audio data on the optical disc 1001. Other parts are the same as in the previous embodiment.

  Note that the switches, the first recording format generation unit, the second recording format generation unit, the digital audio processing unit, and the like shown in FIGS. 7 to 11 may be configured as hardware, or may be configured as a digital signal processor (DSP). ) Or may be realized by software.

  The present invention is not limited to the above embodiment. Information of one stream including at least two channels of audio data is input, and means for increasing this information into at least two streams are provided, and means for formatting data of at least two streams and recording the same on a recording medium are provided. Are also within the scope of the present invention. The means for recording on the recording medium may include a means for recording menu information prepared in advance so as to correspond to each stream. The menu information indicates that the two streams are audio multiplex signals, or a type such as a stereo signal or a multi-channel signal, and furthermore, a recording date. Then, the playback device may display this menu information on a 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.

In the menu display mode at the time of data reproduction, the reproduction device can read the above-described menu information and display the type of the audio signal. Further, when the type of the audio signal is displayed, the user operation method such as stream selection and channel selection may be displayed so as to be easily understood.

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

FIG. 1 is a diagram showing a configuration example of an information recording / reproducing device to which the present invention is applied. FIG. 3 is an explanatory diagram illustrating an example of a processing path of an audio multiplex signal. FIG. 3 is an explanatory diagram shown to explain a part of the data configuration in the DVD video standard for recording and reproduction. FIG. 4 is an explanatory diagram illustrating an example of a stream of an audio channel (data) in a first recording format and a second recording format according to the present invention. FIG. 4 is an explanatory diagram showing a relationship between a second recording format and a packet sequence of the DVD video standard for recording and reproduction. FIG. 3 is an explanatory diagram of a data configuration of an audio pack according to the present invention. The figure which extracts and shows the block of the basic concept of this invention. The figure which shows other embodiment of this invention. FIG. 9 is a diagram showing still another embodiment of the present invention. The figure which shows further another Embodiment of this invention. The figure which shows other embodiment of this invention.

Explanation of reference numerals

30: microcomputer block, 50: decoder unit, 60: encoder unit, 1001: optical disk, 1002: disk drive, 1003: data processor, 2001: hard disk, 2002: hard disk drive.

Claims (3)

An audio encoder that compresses and encodes input audio data;
A first formatter that packetizes and mixes video data and compressed audio data of a plurality of channels into one stream of a first format;
A first recording device that records the converted one stream of the first format on a recording medium,
An audio decoder that reproduces one stream of the recording medium and decodes the encoded audio data;
Means for separating a plurality of channels of the audio signal decoded by the audio decoder and supplying each of the channels to a second formatter to obtain an audio stream in a second format.   The information recording / reproducing device according to claim 1, further comprising a second recording device, wherein the audio stream in the second format is recorded on a disc on which information is recorded by the second recording device. .   2. The information recording / reproducing apparatus according to claim 1, wherein the first formatter can selectively introduce compressed audio data or uncompressed audio data.

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