JP2000156052A - Recording device and method, reproducing device and method, recording/reproducing device and video signal recording/reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To deal with audio data and non-audio data in common when the digital audio data are recorded/reproduced. SOLUTION: The audio data and the non-audio data are recorded on a common area on a magnetic tape. At a recording time, whether the audio data or the non-audio data is recorded on the magnetic tape 123 is stored in the AUX data, and is recorded on the tape 123 for every editing unit of a video. At a reproducing time, whether the reproduced data is the audio data or the non-audio data is discriminated based on the AUX data. When the non-audio data, interpolation processing by an interpolation part 155 is not performed. When an output destination isn't answered to the non-audio data, the non-audio data are muted in an output part 156. Similar information is stored in a DID at every sync block also, and at the time of high speed reproducing that the all data of the editing unit are not obtained, the non-audio data are muted in the output part 156 in a sync block unit based on the DID.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a recording apparatus and method, a reproducing apparatus and method, a recording / reproducing apparatus, and a video signal recording / reproducing apparatus which handle audio data and non-audio data in common.

[0002]

2. Description of the Related Art In recent years, devices which record digital audio data and digital video data on a recording medium and reproduce the digital audio data and digital video data from the recording medium, for example, digital video tape recorders, have become widespread.

FIG. 18 shows that one sample is 16 bits, and
1 schematically shows the configuration of an example of a digital audio device 300 according to the related art, which can process audio data for channels. The device 300 has four input terminals capable of inputting serial audio data for two channels.

[0004] Each terminal is connected to, for example, AES / EBU (Audio
Engineering Society / European Broadcasting Union)
, Serial audio data is input. FIG. 19 shows a format of audio data based on the AES / EBU standard. Two channels of serial audio data are transmitted alternately every half cycle of the frame sequence FS based on the sampling frequency (FIG. 19A). The front side is L in chronological order
The SB side and the rear side are the MSB side. Bits V, U, C and P provided from the rear end of the data are control and parity bits.

[0005] Audio data of up to 24 bits per sample can be transmitted, and audio data having a bit width of 16 bits per sample is transmitted after being left-justified every half cycle of the frame sequence FS (Fig. 19B). ). For example, 16-bit audio data is
One sample is composed of 2 bytes consisting of middle 8 bits and upper 8 bits of 24 bits.

The serial audio data is supplied to an audio recording encoder 301. In the audio recording encoder 301, serial data is converted to parallel data. The audio data of each channel converted into parallel data is stored in a packet of a predetermined length.
After a predetermined process is performed, error correction coding using a product code is performed.

In the coding by the product code, data arranged in a matrix in units of one symbol (for example, one byte) is coded in a column direction by, for example, a Reed-Solomon code. Code parity is generated. Then, the data and the outer code parity are encoded in the row direction to generate an inner code parity. As described above, the outer code parity is generated in the column direction and the inner code parity is generated in the row direction, so that the error correction coding by the product code is performed.

A data block completed with the inner code parity and the outer code parity is called an error correction block. One row of the error correction block corresponds to data of one data packet.

[0009] In addition to the error correction coding process, data for eight channels is shuffled so that each of the channels is dispersed in a predetermined unit in order to increase the resistance to errors. This is performed, for example, by controlling access to a memory used for error correction coding.

The data subjected to the error correction coding and shuffling is assigned a block ID and a sync pattern in packet units to form a sync block. Then, for example, channel coding is performed, the data is converted into a format suitable for recording, and recorded on the recording medium 310. In this example,
The recording medium 310 is a magnetic tape, and a helical track is formed by a recording head provided on a rotating head (not shown), and data is recorded.

[0011] The audio data recorded on the recording medium 310 is reproduced by a reproducing head (not shown) and supplied to a sound reproducing decoder 311. In the decoder 311,
The sync pattern of the reproduction signal is detected, the sync block is cut out, and the block ID stored in each sync block
, Decoding of an error correction code, deshuffling for restoring the order of shuffling performed at the time of recording, and the like are performed. An error is present beyond the error correction capability of the error correction code, and an error flag is set for data that has not been corrected. Thereafter, data correction by interpolation based on preceding and following data, mute processing, and the like are performed.

The data is separated into eight channels of audio data at the time of recording by using, for example, a memory used for decoding the error correction code. Each of the audio data separated into 8 channels is
The audio data is converted into serial audio data based on the AES / EBU standard and output from the audio recording encoder 311. The output audio data is supplied to, for example, an amplifier 312 having a function of D / A conversion for eight channels, is converted into an analog audio signal, is amplified, and is reproduced as sound by speakers 313, 313,. Is done.

[0013]

Here, a case where non-audio data is recorded in an audio data recording area of a recording medium in the above-described configuration will be considered. The non-audio data is, for example, compressed audio data in which uncompressed audio data is compressed by a predetermined method.

At the time of recording, the audio data is compression-encoded by an audio compression encoder (not shown) provided inside or outside the audio recording encoder 301, and recorded on the recording medium 310 as data having a bit width of 16 bits, for example. Is done. And during playback,
The reproduction data is subjected to compression encoding decoding by an audio compression decoder (not shown) provided inside or outside the recording medium 310, and is converted into audio data.
Is output. In the case of such a system, no problem occurs when recording and reproduction are performed by the same system. That is, audio data that has been compression-coded at the time of recording is not output as it is at the time of reproduction.

However, for example, when a recording medium 310 recorded by such a system that compresses and encodes audio data is reproduced by a system that does not perform compression encoding and decoding, the compression encoding The supplied audio data is supplied as it is to the amplifier 312 and output to the speakers 313, 313,... In this case, the speakers 313, 31
.. Have a problem that the maximum sound pressure may be applied and the speakers 313, 313,.

On the other hand, when the processing is closed in the system and, for example, the reproduction signal is not supplied to the amplifier 312 and the speakers 313, 313,... Even if the processing is performed in the same manner as above, there is no fear that a damage accident will occur. However, when an error occurs, error interpolation processing in uncompressed audio processing is performed on the reproduced data. As described above, this error interpolation process is a process specific to audio data, so that performing it on non-audio data is not only meaningless, but also masks the fact that it was an error. There was a problem that it could be.

Further, in the case of variable speed reproduction in which reproduction is performed at a speed different from that at the time of recording, reproduction is performed over a plurality of tracks with one head trace. In such a case, if the same processing as the non-compressed audio data is performed on the compressed audio data, the data string to be reproduced becomes meaningless data in which the compressed data is shredded. If this data is directly decoded and decompressed, the decoded audio signal becomes random (unpleasant) reproduced audio and the speakers 313, 313,.
-There was a problem that it would be output to

In particular, when uncompressed audio data and compressed audio data are mixedly recorded in an audio recording area of one recording medium 310, the above-mentioned variable speed reproduction (especially, When performing (high-speed reproduction), there was a problem that the conventional method such as switching the reproduction mode could not cope.

Accordingly, an object of the present invention is to provide a recording apparatus which can automatically detect non-audio data and perform predetermined processing so that audio data and non-audio data can be handled in common. It is an object of the present invention to provide a method and a reproducing apparatus and method, a recording and reproducing apparatus, and a video signal recording and reproducing apparatus.

[0020]

According to the present invention, there is provided a recording apparatus for recording audio data and non-audio data in a common recording area of a recording medium. And recording means for recording at least one of the non-audio data in a predetermined recording area of the recording medium, wherein the recording means determines whether the data recorded in the predetermined recording area is audio data or non-audio data at the time of recording. Is recorded for each edit unit of audio data or non-audio data.

According to the present invention, there is provided a reproducing apparatus for reproducing a recording medium in which audio data and non-audio data are recorded in a common recording area. And at least one of the audio data and the non-audio data is recorded, and the data type information indicating which of the audio data and the non-audio data has been recorded in the recording area is edited for the audio data or the non-audio data. Reproducing means for reproducing a recording medium recorded for each unit; and output control means for controlling a method of outputting audio data and non-audio data reproduced by the reproducing means with reference to the data type information. Playback device.

According to the present invention, there is provided a recording / reproducing apparatus which records audio data and non-audio data in a common recording area of a recording medium and reproduces the audio data and non-audio data recorded on the recording medium. Error correction means for inputting at least one of audio data and non-audio data and performing error correction coding on the input data, and recording audio data and non-audio data error-correction-coded by the error correction means In addition to recording in a predetermined recording area of the medium, at the time of recording, data type information indicating whether data recorded in the predetermined recording area is audio data or non-audio data is recorded for each audio data or non-audio data editing unit. Recording means for recording on a recording medium, A reproducing unit that reproduces audio data and non-audio data recorded on the medium and reproduces data type information, and decodes error correction codes applied to the audio data and non-audio data reproduced by the reproducing unit to correct errors. Error correction means for performing correction and adding error information indicating that an error could not be corrected to data that could not be corrected by the error correction processing, and audio data and non-audio data having been corrected by the error correction means And an output control means for controlling the output method.

Further, according to the present invention, video data which has been subjected to error correction encoding using a product code is recorded in a first recording area, and audio data and non-audio data are recorded in a common recording area of a recording medium. In a video and audio recording and reproducing device adapted to reproduce audio data and non-audio data recorded on a recording medium,
Video data recording for performing error correction encoding using a product code on video data input together with audio data and non-audio data, adding ID information and a synchronization signal, and recording in a first recording area Means, error correction means for inputting at least one of audio data and non-audio data, and performing error correction coding on the input data, and audio data and non-audio data error-correction-coded by the error correction means Is recorded in a second recording area different from the first recording area of the recording medium, and at the time of recording, data type information indicating whether the data recorded in the second recording area is audio data or non-audio data. Recording means for recording video data on a recording medium for each editing unit of video data, and recording on a recording medium Video data reproducing means for reproducing the reproduced video data, decoding the reproduced video data based on a synchronizing signal and ID information, and performing error correction encoding using a product code, and audio recorded on a recording medium. While reproducing data and non-audio data, data reproducing means for reproducing data type information, and error correction encoding applied to audio data and non-audio data reproduced by the data reproducing means are decoded and error-corrected, Error correction means for adding error information indicating that an error could not be corrected to data that could not be corrected by the error correction processing, and an output method of audio data and non-audio data corrected by the error correction means. Video / audio recording having output control means for controlling It is a raw device.

According to the present invention, in a recording method for recording audio data and non-audio data in a common recording area of a recording medium, at least one of the audio data and the non-audio data is recorded in a predetermined recording area of the recording medium. In the recording step, the data type information indicating whether the data recorded in the predetermined recording area is audio data or non-audio data is edited at the time of recording in the recording step. Recording the data for each unit.

The present invention also relates to a reproducing method for reproducing a recording medium in which audio data and non-audio data are recorded in a common recording area. And at least one of the audio data and the non-audio data is recorded, and the data type information indicating which of the audio data and the non-audio data has been recorded in the recording area is edited for the audio data or the non-audio data. A reproducing step of reproducing a recording medium recorded for each unit; and output control means for controlling an output method of audio data and non-audio data reproduced in the reproducing step with reference to the data type information. This is a characteristic reproduction method.

As described above, according to the recording apparatus and method of the present invention, at least one of audio data and non-audio data is recorded on a predetermined area of a recording medium, and recording is performed on a predetermined area of the recording medium. Since data type information indicating whether the reproduced data is audio data or non-audio data is recorded on a recording medium for each editing unit of audio data or non-audio data, audio data and non-audio data are reproduced based on the data type information during reproduction. The corresponding processing can be performed on the audio data.

As described above, in the reproducing apparatus and method according to the present invention, at least one of audio data and non-audio data is recorded on a predetermined area of a recording medium, and is recorded on the area. And reproducing a recording medium on which data type information indicating whether the reproduced data is audio data or non-audio data is recorded, and controlling an output method of the reproduced audio data and non-audio data with reference to the data type information. Therefore, an optimal output method can be adopted for each of audio data and non-audio data.

As described above, in the recording / reproducing apparatus according to the present invention, at the time of recording, at least one of audio data and non-audio data is recorded in a predetermined area of the recording medium, and the predetermined area of the recording medium is recorded. The data type information indicating whether the data recorded is audio data or non-audio data. The data type information is recorded on a recording medium for each editing unit of audio data or non-audio data. Since the output method of the audio data and the non-audio data is controlled, an optimum output method can be adopted for each of the audio data and the non-audio data.

As described above, in the video / audio recording / reproducing apparatus according to the present invention, at the time of recording, video data is recorded in the first recording area of the recording medium, and audio data and non-audio data are recorded in the second recording area. At least one of the data is recorded, and the data type information indicating whether the data recorded in the second recording area of the recording medium is audio data or non-audio data is stored in the recording medium for each video data editing unit. Recorded and played back,
Since the output method of audio data and non-audio data reproduced with reference to the data type information is controlled, an optimal output method can be adopted for each of the audio data and non-audio data. .

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below. According to the present invention, the information of the type of data recorded in the audio data in the recording medium is recorded in a predetermined area of the recording medium, so that at the time of reproduction,
A process corresponding to the type of data can be automatically performed. For example, in a case where a processing unit corresponding to non-audio data is not provided, when non-audio data is reproduced, silent processing or the like is automatically performed.

An embodiment in which the present invention is applied to a digital VCR will be described below. This embodiment is suitable for use in the environment of a broadcasting station, and enables recording and reproduction of video signals of a plurality of different formats. For example, in an interlaced scan based on the NTSC system, a signal (4
80i signal) and a signal with 576 effective lines (576i signal) in interlaced scanning based on the PAL system
Can be recorded / reproduced almost without changing hardware. Further, a signal having 1080 lines (1080i signal) in interlaced scanning, and a signal having 480 lines, 720 lines, and 1080 lines (480p signal, 720p signal, 1080p signal) in progressive scanning (non-interlace), respectively. Recording / reproduction such as can be performed.

Further, in this embodiment, a video signal is compression-coded based on the MPEG2 system, and an audio signal is treated uncompressed. As is well known, MPEG
No. 2 is a combination of motion compensation predictive coding and compression coding by DCT. The data structure of MPEG2 has a hierarchical structure, and includes a block layer, a macroblock layer, a slice layer, a picture layer, a GOP layer, and a sequence layer from the lowest level.

The block layer is a unit for performing DCT, D
It consists of a CT block. The macroblock layer includes a plurality of D
It is composed of CT blocks. The slice layer is composed of a header section and any number of macroblocks that do not extend between rows. The picture layer includes a header section and a plurality of slices. A picture corresponds to one screen. G
The OP (Group Of Picture) layer includes a header portion, an I picture that is a picture based on intra-frame coding, and P and B pictures that are pictures based on predictive coding.

An I-picture (Intra-coded picture) uses information that is closed only in one picture when it is coded. Therefore, at the time of decoding, decoding can be performed using only the information of the I picture itself. A P-picture (Predictive-coded picture: a forward predictive coded picture) uses a previously decoded I-picture or P-picture which is temporally previous as a predicted picture (a reference picture for taking a difference). . Whether to encode the difference from the motion-compensated predicted image, to encode without taking the difference,
The more efficient one is selected for each macroblock. A B picture (Bidirectionally predictive-coded picture) is a temporally previous I-picture or P-picture which is temporally preceding, and a temporally backward I-picture, We use three types of I-pictures or P-pictures already decoded, as well as interpolated pictures made from both. Among the three types of difference coding after motion compensation and intra coding, the most efficient one is selected for each macroblock.

Therefore, as the macroblock type,
Intra-frame coding (Intra) macroblock, forward (Fward) inter-frame prediction macroblock predicting the future from the past, and backward (Backward) interframe prediction macroblock predicting the future from the future, There is a bidirectional macroblock to be predicted. All macroblocks in an I picture are intra-coded macroblocks. The P picture includes an intra-frame coded macro block and a forward inter-frame predicted macro block. The B picture includes all four types of macroblocks described above.

A GOP includes at least one I picture, and P and B pictures are allowed even if they do not exist. The top sequence layer is composed of a header section and multiple GOPs.
It is composed of

In the MPEG format, a slice is one variable-length code sequence. A variable-length code sequence is a sequence in which a data boundary cannot be detected unless a variable-length code is decoded.

At the head of the sequence layer, GOP layer, picture layer, slice layer, and macroblock layer, an identification code (referred to as a start code) having a predetermined bit pattern aligned in byte units is provided. Be placed. Note that the header section of each layer described above collectively describes a header, extension data, or user data. In the header of the sequence layer, the size of the image (picture) (the number of vertical and horizontal pixels) and the like are described. The time code, the number of pictures constituting the GOP, and the like are described in the header of the GOP layer.

The macro blocks included in the slice layer are:
It is a set of a plurality of DCT blocks, and the encoded sequence of the DCT block is a variable of a sequence of quantized DCT coefficients, with the number of consecutive 0 coefficients (run) and a non-zero sequence (level) immediately after it as one unit. It is a long code. The macroblock and the DCT block in the macroblock are not added with the identification codes arranged in byte units.
That is, they are not one variable-length code sequence.

The macro block is composed of one screen (picture).
It is divided into a grid of 6 pixels × 16 lines. A slice is formed by connecting these macroblocks in the horizontal direction, for example. The last macroblock of the previous slice of a continuous slice and the first macroblock of the next slice are continuous, and it is not allowed to form a macroblock overlap between slices. When the size of the screen is determined, the number of macroblocks per screen is uniquely determined.

On the other hand, in order to avoid signal deterioration due to decoding and encoding, it is desirable to edit the encoded data. At this time, the P picture and the B picture require a temporally preceding picture or a preceding and succeeding picture for decoding. Therefore, the editing unit cannot be set to one frame unit. In consideration of this point, in this embodiment, one GOP is made up of one I picture.

For example, a recording area in which recording data for one frame is recorded is a predetermined area. MPEG2
Since the variable length coding is used, the amount of generated data for one frame is controlled so that data generated during one frame period can be recorded in a predetermined recording area. Further, in this embodiment, one slice is composed of one macroblock so as to be suitable for recording on a magnetic tape, and one macroblock is applied to a fixed frame having a predetermined length.

FIG. 1 shows an example of the configuration on the recording side of the recording / reproducing apparatus 100 according to this embodiment. At the time of recording, a predetermined interface such as SDI (Serial Data Inter
digital video signal via terminal 1)
Input from 01. SDI is an interface defined by SMPTE for transmitting (4: 2: 2) component video signals, digital audio signals, and additional data.

The input video signal is supplied to the video encoder 10
In step 2, the data undergoes DCT (Discrete Cosine Transform) processing, is converted into coefficient data, and the coefficient data is subjected to variable length coding. The variable length coded (VLC) data from the video encoder 102 is an elementary stream compliant with MPEG2. This output is supplied to one input terminal of the selector 103.

On the other hand, through the input terminal 104, the ANSI
SDTI (Serial Data Transport Inter), which is an interface defined by / SMPTE 305M
face) format data is input. This signal is synchronously detected by SDTI receiving section 105. And
Once stored in the buffer, the elementary stream is extracted. The extracted elementary stream is supplied to the other input terminal of the selector 103.

The elementary stream selected and output by the selector 103 is supplied to a stream converter 106. In the stream converter 106, the MPE
The DCT coefficients arranged for each DCT block based on the G2 rule are replaced with a plurality of DCTs constituting one macroblock.
Through the T block, frequency components are grouped, and the grouped frequency components are rearranged. The rearranged converted elementary stream is stored in the packing and shuffling unit 1.
07.

Since the video data of the elementary stream is variable-length coded, the data length of each macroblock is not uniform. In the packing and shuffling unit 107, macro blocks are packed in a fixed frame. At this time, the portion that protrudes from the fixed frame is sequentially packed into a surplus portion with respect to the size of the fixed frame. Also, system data such as time code is input to the input terminal 108.
Is supplied to the packing and shuffling unit 107, and the system data is subjected to a recording process similarly to the picture data. Also, shuffling is performed in which the macroblocks of one frame generated in the scanning order are rearranged and the recording positions of the macroblocks on the tape are dispersed. Shuffling can improve the image update rate even when data is reproduced in pieces during variable speed reproduction.

The video data and system data from the packing and shuffling unit 107 (hereinafter, also referred to as video data even when system data is included unless otherwise required) are supplied to the outer code encoder 109. A product code is used as an error correction code for video data and audio data. The product code encodes an outer code in a vertical direction of a two-dimensional array of video data or audio data, encodes an inner code in a horizontal direction thereof, and encodes data symbols doubly. As the outer code and the inner code, a Reed-Solomon code can be used.

The output of the outer code encoder 109 is supplied to a shuffling unit 110, and shuffling is performed so that the order is changed in units of sync blocks over a plurality of error correction blocks. Shuffling in sync block units prevents errors from concentrating on a specific error correction block. Shuffling performed by the shuffling unit 110 may be referred to as interleaving. The output of the shuffling unit 110 is supplied to the mixing unit 111,
Mixed with audio data. The mixing unit 111
Is constituted by a main memory as described later.

Audio data is supplied from an input terminal denoted by reference numeral 112. In this embodiment, an uncompressed digital audio signal is handled. As will be described later, non-audio data can also be handled. The digital audio signal is a signal separated by an SDI receiving unit (not shown) or an SDTI receiving unit 105 on the input side, or a signal input via an audio interface. The input digital audio signal is supplied to the AUX adding unit 114 via the delay unit 113. Delay unit 113
Is for time alignment of audio and video signals. Audio AU supplied from input terminal 115
X is auxiliary data, and includes audio data such as the sampling frequency of audio data and whether the data supplied from the input terminal 112 is audio data or non-audio data such as compressed audio data. This is data having related information. The audio AUX is added to the audio data by the AUX adding unit 114, and is treated the same as the audio data.

The audio data and AUX from the AUX adding unit 114 (hereinafter, AUX unless otherwise necessary)
Is also simply referred to as audio data. ) Is supplied to the outer code encoder 116. Outer code encoder 11
No. 6 encodes an outer code for audio data. The output of the outer code encoder 116 is the shuffling unit 1
17 and undergoes a shuffling process. As audio shuffling, shuffling in sync block units and shuffling in channel units are performed.

The output of the shuffling unit 117 is
1 and the video data and the audio data are converted into data of one channel. The output of the mixing unit 111 is ID
The adding unit 118 is supplied, and the ID adding unit 118 adds an ID including information indicating a sync block number. The output of the ID addition unit 118 is the inner code encoder 119
, And the inner code is encoded. Further, the output of the inner code encoder 119 is supplied to the synchronization adding section 120, and a synchronization signal for each sync block is added. By adding the synchronization signal, recording data in which the sync blocks are continuous is configured. This recording data is supplied to the rotary head 122 via the recording amplifier 121, and is recorded on the magnetic tape 123. In practice, the rotary head 122 is configured such that a plurality of magnetic heads having different azimuths of heads forming adjacent tracks are attached to the rotary drum.

The recording data may be scrambled as required. Further, digital modulation may be performed at the time of recording, and a partial response class 4 and Viterbi code may be used.

FIG. 2 shows an example of the configuration on the reproducing side of the recording / reproducing apparatus 100 according to one embodiment of the present invention. Magnetic tape 1
From 23, a reproduction signal reproduced by the rotary head 122 is supplied to the synchronization detection unit 132 via the reproduction amplifier 131.
Equalization and waveform shaping are performed on the reproduced signal. Further, demodulation of digital modulation, Viterbi decoding, and the like are performed as necessary. The synchronization detection unit 132 detects a synchronization signal added to the head of the sync block. The sync block is cut out by the synchronization detection.

The output of the synchronization detection block 132 is supplied to the inner code encoder 133, and the error of the inner code is corrected. The output of the inner code encoder 133 is the ID interpolation unit 13
The ID of the sync block, which has been supplied to the block No. 4 and made an error by the inner code, for example, a sync block number is interpolated. The ID interpolation unit 134 extracts a DID (to be described later), which is information of data stored in the sync block. The DID is supplied to the output unit 156.

The output of the ID interpolation unit 134 is supplied to a separation unit 135, where the video data and the audio data are separated. The separation is performed, for example, by separating data reproduced from the corresponding areas from each other. As described above, video data means DCT coefficient data and system data generated by MPEG intra coding, and audio data is PCM (Pulse Code Modu).
lation) means data and AUX.

The video data from the separation unit 135 is subjected to a process reverse to shuffling in the deshuffling unit 136. The deshuffling unit 136 performs a process of restoring the shuffling in sync block units performed by the shuffling unit 110 on the recording side. Deshuffling part 136
Is supplied to the outer code decoder 137, and error correction by the outer code is performed. When an error that cannot be corrected occurs, an error flag indicating the presence or absence of the error is set to indicate the presence of the error.

The output of the outer code decoder 137 is supplied to a deshuffling and depacking unit 138. The deshuffling and depacking unit 138 performs processing for restoring shuffling in macroblock units performed by the packing and shuffling unit 107 on the recording side. In the deshuffling and depacking unit 138,
Disassemble the packing applied during recording. That is, the length of the data is returned in units of macroblocks, and the original variable length code is restored. Further, in the deshuffling and depacking unit 138, the system data is separated,
It is taken out to the output terminal 139.

Deshuffling and depacking unit 13
The output of No. 8 is supplied to the interpolation unit 140, and the data for which the error flag is set (that is, there is an error) is corrected. That is, if it is determined that there is an error in the macroblock data before the conversion, the DCT coefficients of the frequency components after the error location cannot be restored. Therefore, for example, the data at the error location is replaced with a block end code (EOB), and the DCT coefficients of the subsequent frequency components are set to zero. Similarly, at the time of high-speed reproduction, only DCT coefficients up to the length corresponding to the sync block length are restored, and the coefficients thereafter are replaced with zero data.

Further, the interpolation section 140 performs processing for recovering the header (sequence header, GOP header, picture header, user data, etc.) when the header added to the head of the video data is an error.

Since the DCT coefficients are arranged from the DC component and the low-frequency component to the high-frequency component across the DCT block, even if the DCT coefficients are ignored from a certain point onward, the macro block , DCT coefficients from DC and low-frequency components can be distributed evenly to each of the DCT blocks constituting.

The output of the interpolation section 140 is supplied to the stream converter 141. In the stream converter 141, the reverse process to that of the stream converter 106 on the recording side is performed. That is, the DCT coefficients arranged for each frequency component across the DCT blocks are rearranged for each DCT block. Thereby, the reproduced signal is converted into an elementary stream conforming to MPEG2.

As for the input / output of the stream converter 141, a sufficient transfer rate (bandwidth) is secured in accordance with the maximum length of the macroblock, as in the recording side. When the length of the macroblock is not limited, it is preferable to secure a bandwidth three times the pixel rate.

The output of the stream converter 141 is supplied to the video decoder 142. Video decoder 142
Decodes the elementary stream and outputs video data. That is, the video decoder 142 performs an inverse quantization process and an inverse DCT process. The decoded video data is taken out to the output terminal 143. For the interface with the outside, for example, SDI is used. In addition, the elementary stream from the stream converter 141 is supplied to the SDTI transmitting unit 144. Although illustration of the path is omitted, the SDTI transmission unit 144 is also supplied with system data, reproduced audio data, and AUX, and
It is converted into a stream having a data structure of the TI format. The stream from the SDTI transmission unit 144 is output to the outside through the output terminal 145.

The audio data separated by the separation unit 135 is supplied to the deshuffling unit 151. The deshuffling unit 151 performs a process opposite to the shuffling performed by the shuffling unit 117 on the recording side. The output of the deshuffling unit 117 is supplied to the outer code decoder 152, and error correction by the outer code is performed. Outer code decoder 152
Output the error-corrected audio data. An error flag is set for data having an uncorrectable error.

The output of the outer code decoder 152 is supplied to an AUX separation section 153, where the audio AUX is separated.
Although details will be described later, AUX data is AUX0, AUX
1 and AUX2. Audio AU isolated
X is taken out to the output terminal 154. The audio data is supplied to the interpolation unit 155. The interpolating unit 155 interpolates a sample having an error. As an interpolation method, as shown in an example in FIG. 3, an average value interpolation for interpolating with an average value of correct data before and after in time, a previous value hold for holding a previous correct sample value, and the like can be used. The output of the interpolation unit 155 is supplied to the output unit 156.
The output unit 156 controls a method of outputting the supplied data. For example, in the output unit 156, a mute process for inhibiting the output of an audio signal that is in error and cannot be interpolated,
In addition, a delay amount adjustment process for time alignment with a video signal is performed. The reproduced audio signal is extracted from the output unit 156 to the output terminal 157.

On the other hand, A separated by AUX separation section 153
The UX0 data is supplied to the interpolation unit 155 and the output unit 156. The interpolation unit 155 controls whether or not to perform the interpolation process on the supplied audio data based on the contents of the AUX0 data. Similarly, the output unit 156 controls whether to perform a mute process on the supplied audio data based on the content of the AUX0 data. Further, as described above, the output unit 156 outputs the I
DID is supplied from the D interpolation unit 134. Output unit 156
Is also controlled by this DID.

Although not shown in FIGS. 1 and 2, a timing generator for generating a timing signal synchronized with the input data, a system controller (microcomputer) for controlling the entire operation of the recording / reproducing apparatus, and the like are provided. Have been.

In this embodiment, signals are recorded on a magnetic tape by a helical scan method in which a magnetic head provided on a rotary head forms an oblique track. A plurality of magnetic heads are provided on the rotating drum at positions facing each other. That is, when the magnetic tape is wound around the rotary head at a winding angle of about 180 °, the rotation of the rotary head 1
By the rotation of 80 °, a plurality of tracks can be formed at the same time. The magnetic heads are formed as a set of two magnetic heads having different azimuths. The plurality of magnetic heads
The azimuths of adjacent tracks are arranged to be different from each other.

FIG. 4 shows an example of a track format formed on a magnetic tape by the rotary head described above. This is an example in which video and audio data per frame are recorded on eight tracks. For example, the frame frequency is 29.97 Hz, and the rate is 50 Mbp
s, the number of effective lines is 480, and the number of effective horizontal pixels is 720
A pixel interlace signal (480i signal) and an audio signal are recorded. When the frame frequency is 25H
z, the rate is 50 Mbps, the number of effective lines is 576, and the number of effective horizontal pixels is 720.
6i signal) and audio signal can also be recorded in the same tape format as in FIG.

One segment is composed of two tracks having different azimuths. That is, eight tracks are composed of four segments. Track number corresponding to azimuth for a set of tracks constituting a segment

[0] and a track number [1] are assigned. In the example shown in FIG. 4, track numbers are exchanged between the first eight tracks and the second eight tracks, and different track sequences are assigned to each frame. Thus, even if one of the set of magnetic heads having different azimuths becomes unreadable due to clogging or the like, the influence of an error can be reduced by using the data of the previous frame.

In each of the tracks, a video sector in which video data is recorded is arranged at both ends, and an audio sector in which audio data is recorded is interposed between the video sectors. 4 and FIG. 5, which will be described later, show the arrangement of audio sectors on the tape.

In the track format shown in FIG. 4, eight channels of audio data can be handled. A1 to A8 indicate sectors of channels 1 to 8 of the audio data, respectively. The audio data is recorded with its arrangement changed in segment units. For audio data, audio samples generated in one field period (for example, when the field frequency is 29.97 Hz and the sampling frequency is 48 kHz, 800 or 801 samples) are divided into even-numbered samples and odd-numbered samples. Each sample group and AUX form one error correction block of a product code.

In FIG. 4, since data for one field is recorded on four tracks, two error correction blocks per channel of audio data are recorded on four tracks. The data of the two error correction blocks (including the outer code parity) are divided into four sectors, and as shown in FIG. A plurality of sync blocks included in the two error correction blocks are shuffled. For example, two error correction blocks of channel 1 are constituted by four sectors to which reference numbers A1 are assigned.

In this example, video data of four error correction blocks is shuffled (interleaved) for one track in this example, and the upper side
The data is divided into sectors by e and Lower Side and recorded. In the video sector of Lower Side,
A system area is provided at a predetermined position.

In FIG. 4, SAT1 (Tr) and SAT2 (Tm) are areas in which servo lock signals are recorded. In addition, a gap of a predetermined size (Vg1, Sg1, Ag, Sg) is provided between the recording areas.
2, Sg3 and Vg2).

FIG. 4 shows an example in which data per frame is recorded on eight tracks.
Recording can be performed on tracks, six tracks, and the like.
FIG. 5A shows a format in which one frame has six tracks. In this example, the track sequence is

Only [0] is set.

As shown in FIG. 5B, the data recorded on the tape is composed of a plurality of equally-spaced blocks called sync blocks. FIG. 5C schematically shows the configuration of a sync block. As will be described later in detail, the sync block is composed of a SYNC pattern for detecting synchronization, an ID for identifying each sync block, a DID indicating the content of subsequent data, a data packet, and an inner code parity for error correction. Is done. Data is,
It is treated as a packet in sync block units. That is, the smallest data unit to be recorded or reproduced is one sync block. A number of sync blocks are arranged (FIG. 5B) to form, for example, a video sector (FIG. 5A).

FIG. 6 more specifically shows the data structure of a sync block of video data, which is the minimum unit for recording / reproduction. In this embodiment, one or two macroblocks of data (VLC data) are stored for one sync block according to the format of video data to be recorded, and the size of one sync block is reduced. The length is changed according to the format of the video signal to be handled. As shown in FIG. 6A, one sync block is
From the beginning, a 2-byte SYNC pattern, a 2-byte I
D, a 1-byte DID, for example, a data area variably defined between 112 bytes and 206 bytes, and a 12-byte parity (inner code parity). Note that the data area is also called a payload.

The first two bytes of the SYNC pattern are for synchronization detection and have a predetermined bit pattern. Synchronization detection is performed by detecting a SYNC pattern that matches the unique pattern.

FIG. 7A shows an example of the bit assignment of ID0 and ID1. The ID has important information inherent to the sync block, and each ID has 2 bytes (ID
0 and ID1). ID0 is 1
The identification information (SYNC ID) for identifying each of the sync blocks in the track is stored. SYNC
The ID is, for example, a serial number assigned to a sync block in each sector. The SYNC ID is represented by 8 bits. SYNC IDs are separately assigned to video sync blocks and audio sync blocks.

ID1 stores information on the track of the sync block. When the MSB side is bit 7 and the LSB side is bit 0, with respect to this sync block,
Bit 7 indicates whether the track is above (upper) or below (Lo)
wer), and bits 5 to 2 indicate the segment of the track. Bit 1 indicates the track number corresponding to the azimuth of the track.
Are bits for distinguishing video data and audio data by this sync block.

FIG. 7B shows an example of the DID bit assignment in the case of video. The DID stores information related to the payload. The content of DID differs between video and audio based on the value of bit 0 of ID1 described above. Bits 7 to 4 are undefined (Reserve
d). Bits 3 and 2 are the mode of the payload, for example, indicating the type of the payload.
Bits 3 and 2 are auxiliary. Bit 1 indicates that one or two macroblocks are stored in the payload. Bit 0 indicates whether the video data stored in the payload is an outer code parity.

FIG. 7C shows an example of bit assignment of DID in the case of audio. Bits 7-4 are R
Eserved. Bit 3 indicates whether the data stored in the payload is audio data or general data (non-audio data). If, for example, compression-encoded audio data is stored in the payload, bit 3 is a value indicating general data. Bit 2 to bit 0 store information of a 5-field sequence in the NTSC system. That is, in the NTSC system, an audio signal for one field of a video signal is 800 when the sampling frequency is 48 kHz.
Sample or 801 sample, and this sequence is prepared every five fields. Bit 2 to bit 0
Indicates where in the sequence it is located.

Referring back to FIG. 6, FIGS. 6B to 6E
Shows an example of the above-mentioned payload. 6B and 6C
Shows an example in which video data (variable-length coded data) of 1 and 2 macroblocks is stored for the payload, respectively. In the example shown in FIG. 6B in which one macroblock is stored, length information LT indicating the length of the following macroblock is arranged in the first three bytes.
The length information LT may or may not include its own length. 6C shown in FIG.
In an example in which a macroblock is stored, the length information LT of the first macroblock is arranged at the head, and the first macroblock is arranged subsequently. Then, length information L indicating the length of the second macroblock following the first macroblock
T is arranged, followed by a second macroblock.
The length information LT is information necessary for depacking.

FIG. 6D shows video A for the payload.
An example in which UX (auxiliary) data is stored will be described. The head length information LT describes the length of the video AUX data. Subsequent to the length information LT, 5-byte system information, 12-byte PICT information, and 92-byte user information are stored. The remaining portion of the payload length is reserved.

FIG. 6E shows an example in which audio data is stored in the payload. Audio data can be packed over the entire length of the payload. The audio signal is not subjected to compression processing or the like, and is handled in, for example, a PCM format. However, the present invention is not limited to this, and it is also possible to handle non-audio data, for example, audio data compressed and encoded by a predetermined method.

In this embodiment, the length of the payload, which is the storage area of the data of each sync block, is not optimally set for the video sync block and the audio sync block, and therefore is not equal to each other. . In addition, the length of a sync block for recording video data and the length of a sync block for recording audio data are set to optimal lengths according to the signal format. Thereby, a plurality of different signal formats can be handled uniformly.

FIG. 8A shows the order of DCT coefficients in video data output from the DCT circuit of the MPEG encoder. Starting from the DC component at the upper left in the DCT block, in the direction where the horizontal and vertical spatial frequencies increase,
DCT coefficients are output by zigzag scan. As a result, as shown in FIG. 8B, a total of 64 (8
DCT coefficients of (pixel × 8 lines) are obtained by being arranged in the order of frequency components.

This DCT coefficient is equal to the V of the MPEG encoder.
Variable length coding is performed by the LC unit. That is, the first coefficient is fixed as a DC component, and the next component (AC
From the component), codes are assigned corresponding to the run of zero and the subsequent level. Therefore, the variable-length coded output for the coefficient data of the AC component is converted from the low (low-order) coefficient of the frequency component to the high (high-order) coefficient of AC ₁ ,
AC ₂ , AC ₃ ,... The elementary stream includes DCT coefficients subjected to variable length coding.

The stream converter 106 rearranges the DCT coefficients of the supplied signal. That is, in each macroblock, DCT coefficients arranged in order of frequency components for each DCT block by zigzag scan are rearranged in order of frequency components over each DCT block constituting the macroblock.

FIG. 9 shows this stream converter 106.
2 schematically shows the rearrangement of the DCT coefficients in. (4:
2: 2) In the case of component signals, one macro block
Are four DCT blocks (Y₁,
Y_Two, Y_ThreeAnd Y_Four) And those of the chromaticity signals Cb and Cr
Each of the two DCT blocks (Cb₁, C
b _Two, Cr₁And Cr_Two).

As described above, the video encoder 102
Then, a zigzag scan is performed in accordance with the rules of MPEG2, and as shown in FIG. 9A, for each DCT block,
DCT coefficient is changed from DC component and low frequency component to high frequency component,
The frequency components are arranged in order. When scanning of one DCT block is completed, scanning of the next DCT block is performed, and similarly, DCT coefficients are arranged.

That is, in the macro block, DCT blocks Y ₁ , Y ₂ , Y ₃ and Y ₄ , DCT block C
For each of b ₁ , Cb ₂ , Cr ₁ and Cr ₂ , the DCT coefficients are arranged in order of frequency from the DC component and the low-frequency component to the high-frequency component. Then, [DC, AC ₁ , AC
_2, AC _3, and..], So that codes are assigned, it is variable length coded.

In the stream converter 106, the variable-length coded and arranged DCT coefficients are once decoded by the variable-length code to detect the break of each coefficient, and the frequency is spread over each DCT block constituting the macro block. Summarize by component. This is shown in FIG. 9B. First, the DC components of the eight DCT blocks in the macroblock are summarized, the AC coefficient components of the eight DCT blocks having the lowest frequency components are summarized, and the AC coefficients of the same order are grouped in order. The coefficient data is rearranged across the DCT blocks.

The rearranged coefficient data is DC
(Y ₁ ), DC (Y ₂ ), DC (Y ₃ ), DC
(Y ₄ ), DC (Cb ₁ ), DC (Cb ₂ ), DC (C
r ₁ ), DC (Cr ₂ ), AC ₁ (Y ₁ ), AC ₁ (Y
₂ ), AC ₁ (Y ₃ ), AC ₁ (Y ₄ ), AC ₁ (Cb
₁ ), AC ₁ (Cb ₂ ), AC ₁ (Cr ₁ ), AC
₁ (Cr ₂ ),. Where DC, AC ₁ ,
AC ₂ ,... Are, as described with reference to FIG. 8, variable-length codes assigned to a set consisting of a run and a subsequent level.

The converted elementary stream in which the order of the coefficient data is rearranged by the stream converter 106 is supplied to the packing and shuffling unit 107. The data length of the macroblock is the same for the converted elementary stream and the elementary stream before conversion. In the video encoder 102, even if the length is fixed in GOP (one frame) units by bit rate control, the length varies in macroblock units. The packing and shuffling unit 107 applies the data of the macroblock to the fixed frame.

FIG. 10 schematically shows a packing process of macroblocks in packing and shuffling section 107. The macro block is applied to a fixed frame having a predetermined data length and is packed. The data length of the fixed frame used at this time is matched with the sync block length, which is the minimum unit of data during recording and reproduction.
This is to simplify the processing of shuffling and error correction coding. In FIG. 10, for simplicity, it is assumed that one frame includes eight macroblocks.

As shown in an example in FIG. 10A, the lengths of the eight macroblocks are different from each other due to the variable length coding. In this example, as compared with the length of one sync block, which is a fixed frame, the data of macro block # 1, data of # 3 and data of # 6 are each longer, and data of macro block # 2, data of # 5, # 7 data and #
8 are short. Also, macro block # 4
Has a length substantially equal to one sync block.

By the packing process, macro blocks are packed into a fixed-length frame having a length of one sync block. Data can be packed without excess or shortage because the amount of data generated in one frame period is controlled to a fixed amount. As shown in an example in FIG. 10B, a macroblock longer than one sync block is divided at a position corresponding to the sync block length. Of the divided macroblocks, the portion (overflow portion) that protrudes from the sync block length is packed in an area that is vacant in order from the beginning, that is, after the macroblock whose length is less than the sync block length.

In the example of FIG. 10B, macro block # 1
The portion that is out of the sync block length is first packed after the macro block # 2, and when it reaches the length of the sync block, it is packed after the macro block # 5. Next, the portion of the macro block # 3 that is outside the sync block length is packed behind the macro block # 7. Further, a portion of the macro block # 6 that protrudes from the sync block length is packed behind the macro block # 7, and a portion that protrudes further from the macro block # 7.
Stuffed behind 8. Thus, each macroblock is packed in a fixed frame of the sync block length.

The length of each macro block can be checked in advance by the stream converter 106.
As a result, the packing unit 107 can know the end of the data of the macro block without decoding the VLC data and checking the contents.

FIG. 11 shows an example of an error correction code used in one embodiment, FIG. 11A shows one error correction block of an error correction code for video data, and FIG. 11B shows an error correction code for audio data. 3 shows one error correction block. In FIG. 11A, VL
The C data is data from the packing and shuffling unit 107. SYN for each row of VLC data
By adding the C pattern, ID, and DID, and further adding the parity of the inner code, one SYNC block is formed.

That is, a 10-byte parity of the outer code is generated from a predetermined number of symbols (bytes) aligned in the vertical direction of the array of VLC data, and the ID, DID and VLC data (or outer parity) aligned in the horizontal direction are generated. Parity of the inner code is generated from a predetermined number of symbols (bytes) of the code parity. In the example of FIG. 11A, 10 outer code parity symbols and 12 inner code parity symbols are added. As a specific error correction code, a Reed-Solomon code is used. FIG.
In 1A, the difference between the lengths of VLC data in one SYNC block is 59.94 Hz, 25 Hz, 23.
This is because the frame frequency of video data is different, such as 976 Hz.

As shown in FIG. 11B, the product code for audio data is the same as that for video data.
The parity of the 10-symbol outer code and the parity of the 12-symbol inner code are generated. In the case of audio data, the sampling frequency is, for example, 48 kHz.
And one sample is quantized to 16 bits. One sample may be converted into another bit number, for example, 24 bits. According to the difference in the frame frequency described above, 1SYN
The amount of audio data in the C block is different.
As described above, one field of audio data /
One channel forms two error correction blocks. One error correction block includes one of the even-numbered and odd-numbered audio samples and the audio AUX as data.

In the recording / reproducing apparatus 100 described above, the audio data has a bit width of one sample of 16 bits (2 bits).
Bytes). Next, with this device 100,
A method of handling audio data and non-audio data in common will be described. First, the recording format of audio data will be described in more detail.

In the following description, audio data having a bit width of 16 bits per sample is defined as 1 bit.
Briefly described as 6-bit audio data.

FIG. 12 shows the outer code encoder 11 described above.
6 shows an example of audio data to which an outer code parity is added. This is an example in which the sampling frequency is audio data of 48 KHz and the field period of the video data is 50 Hz. The 960 samples of audio data correspond to one video period. In each channel of the audio data, two error correction blocks in which the outer code parity of 10 sync blocks is added to the audio data of 8 sync blocks are formed in one field period. That is,
The audio data for one field period includes 36 sync blocks including the outer code parity.

The audio data of each channel constitutes one error correction block with even-numbered samples and odd-numbered samples in one field period. In FIG. 12, each frame in one error correction block represents one sample of data. In this example, since one sample is 16 bits (2 bytes), each frame is data of 16 bits. One row in the horizontal direction corresponds to one sync block. The number added to the head of each row is called an outer code number, and is an identification number of a sync block within one field period.

In each of the first three sync blocks of each error correction block, AU is added to the first sample.
X data is stored. FIG. 13 shows an example of the content of each AUX data. FIG. 13A shows the bit assignment of AUX data, and FIG. 13B shows the meaning of each data.

AUX0 is 2 representing an audio editing point.
Bit data EF, 1 indicating whether the quantization bit number of the audio sample is 16 bits or 24 bits
Bit length data B of bits, 1-bit data D indicating whether or not it is uncompressed audio data, 2-bit audio mode Amd for identifying whether this channel is a paired channel with another channel, and the sampling frequency is 48KHz, 44.1KHz, 32KH
It consists of 2-bit data FS indicating which of z and 96 Hz. The next 8 bits and one sample are 24
If it is a bit, 8 more bits are reserved.
ed (reserved).

As described above, by checking the value of bit 3 of AUX0 and the value of data D, it is determined whether the data of the audio sector in this one-field period is uncompressed audio data.
Other than the non-compressed audio data, for example, it can be determined whether it is compressed audio data.

AUX1 is entirely reserved.
(Reserved). The data AUX2 has the format mode in the first 8 bits. If the subsequent 8 bits and one sample are 24 bits, another 8 bits are reserved. The format mode is a 2-bit [Line mod].
e], 2-bit [Rate], 1-bit [Sca
n] and 3 bits [Freq]. These [Li
The video format can be known from [ne mode], [Rate], [Scan] and [Freq].

FIG. 14 shows an example of the configuration of an audio sector. This is an example in which one audio sector includes six sync blocks and data of one field period is recorded using six tracks. In FIG. 14A, one horizontal row indicates one sector in one track. FIG.
The numbers in each frame of 4A correspond to the outer code numbers in FIG. 36 sync blocks constituting one channel of audio data within one field period are shuffled between tracks and in sync block units. As a result, for example, rearrangement is performed as shown in FIG. 14A. Also, six sync blocks are arranged in a sector (FIG. 14B), and in each sync block, a sync pattern, a block ID, a DID, and a data packet are arranged from the beginning, and an inner code parity is added after the sync pattern (FIG. 14B). 14C).

Data packets are D0, D1,.
Data is packed in units of one byte in the order of D2,. That is, the first 8 bits of AUX0, AUX1 and data AUX2 described above are stored in D0 at the head of the data packet.

FIG. 15 shows an example of the format of audio data input to the apparatus 100. The audio data is input from the input terminal 112 as, for example, serial data based on the AES / EBU standard. FIG. 15A
Is a frame sequence, which is a sampling sequence of audio data. In this example, data having a bit width of up to 24 bits can be transmitted during one frame sequence FS. 1
Two channels of audio data can be transmitted by the serial data of the system, and the channel is switched every time the frame sequence FS is inverted. In this example, one input system is assigned to each of the set of channels 1 and 2, the set of channels 3 and 4, the set of channels 5 and 6, and the set of channels 7 and 8. .

FIG. 15B shows an example of the format of 16-bit audio data. In time series, the front is on the LSB side and the rear is on the MSB side. Data is packed from the LSB side to the MSB side, with the frame sequence FS being left-justified. Before and after the frame sequence FS is inverted, four control bits are allocated.

The audio data is input to the device 100 in such a serial data format.
It is handled in units of one byte (8 bits). FIG. 15C shows an example in which 16-bit audio data input as shown in FIG. 15B is handled in units of 1 byte (8 bits). The above-described error correction processing is performed in units of one symbol, for example, with one byte as one symbol. Therefore, if data is handled in units of one byte, the processing becomes easy.

FIG. 16 shows an example of transmitting non-audio data in this format. The data having a bit width of 16 bits is set to data 0 and data 1 in units of 1 byte, and is packed from the LSB side to the MSB side with respect to the frame sequence FS. As described above, non-audio data is transmitted in the same manner as the above-described audio data in byte units.

Next, with reference to FIG.
Processing for recording / reproducing audio data / non-audio data will be described. The recording encoder 200
This corresponds to the configuration of FIG. 1 described above. Similarly, the reproduction decoder 201 corresponds to the configuration of FIG. 2 described above. In FIG. 17, the system of the video data is omitted. Alternatively, recording encoder 2
00 and the playback decoder 201 may be devices that handle only audio signals.

This system supports input / output of 8 channels / 4 systems. That is, the recording encoder 20
In the case of 0, the input data of four systems is rate-converted by, for example, being put on a higher-speed clock, and is converted into a single-system signal by time-division processing and processed. Similarly,
In the reproduction decoder 201, for example, data reproduced as one system signal is subjected to error correction code decoding processing, rate conversion is performed according to the output signal rate, and divided into signals of each system / channel. Is output.

In the reproduction decoder 201, the interpolation section 155 and the output section 156 can perform interpolation processing and mute processing for each channel by, for example, time division processing.

In the example of FIG. 17, uncompressed audio data is input to channels 1/2 and 3/4. Further, a data compression circuit 210 is inserted into channels 5/6 and channels 7/8, and the input uncompressed audio data is compressed by a predetermined method to form compressed audio data. Supplied.

On the other hand, on the reproduction decoder 201 side, the data decompression circuit 21 corresponding to the data compression circuit 210 on the recording side is used.
1 is inserted for the output channel corresponding to the recording encoder 200. When the compressed audio data that has been compression-encoded by the data compression circuit 210 and recorded by the recording encoder 200 is reproduced by the reproduction decoder 201, the data decompression circuit 211 performs data decompression processing for decoding the compression encoding. Are output as uncompressed audio data.

The recording encoder 200 stores information indicating the type of data in the AUX area of the supplied data of each channel. Information is stored twice for each editing unit. In this case, the editing unit is one field or one frame of the video data supplied together. That is, for data of channel 1/2 and channel 3/4, the value of bit 3 of AUX0 and the value of data D are

[0] is set. Bits 3 and 4 of AUX0 for data of channels 5/6 and 7/8
The value of the data D is set to [1] and stored in the corresponding AUX area.

Further, in this embodiment, information indicating the type of data is stored for the DID arranged for each sync block. For example, for uncompressed audio data of channel 1/2 and channel 3/4, the value of bit 3 of DID is

[0] is set. For compressed audio data of channels 5/6 and 7/8, the value of bit 3 of the DID is set to [1] and stored in the corresponding DID.

The AUX data and the DID are obtained by the processing described with reference to FIG.
The data is recorded in the audio sector of the magnetic tape 123 together with the data inputted from. The AUX data and DID are created by, for example, a system controller (not shown). The creation is performed, for example, by the user setting the system controller according to the configuration of the system used for reproduction. The setting can be automatically created according to the configuration of the apparatus.

At the time of reproduction, data is reproduced from the magnetic tape 123 by the processing already described with reference to FIG. 2, and the data recorded in the audio sector is
Each channel is divided. Then, AUX0 included in the reproduction data is supplied to the interpolation unit 155.
UX0 and DID are supplied to the output unit 156. The interpolation unit 155 and the output unit 156 can determine whether the data is uncompressed audio data or compressed audio data for each channel based on AUX0 and DID.

Then, for example, as shown in the example of FIG.
When 1 is provided, decompression processing corresponding to compression encoding at the time of recording can be performed. Therefore, AU
Based on bit 3 of X0 and data D, channel 5/6
In the channel 7/8, the interpolation processing for the output data in the interpolation unit 155 and the mute processing in the output unit 156 are not performed. The output data is output without being subjected to the interpolation processing and the mute processing, and is supplied to the data decompression circuit 211. Then, the data is subjected to a predetermined decompression process to obtain audio data.

On the other hand, similarly, in the configuration shown in FIG. 17, when reproducing the magnetic tape 123 on which the channels 5/6 and 7/8 are recorded as compressed audio data without the data decompression circuit 211, the user is required Depending on the system configuration, channel 5/6 and channel 7
It is necessary to perform mute processing on the output of / 8. In such a case, based on bit 3 of AUX0 and data D, the output unit 156 performs mute processing on the outputs of channels 5/6 and 7/8. For example, all the data of these channels

[0]
Mute processing is performed by replacing the data and outputting silence. Such control based on the hybrid system is performed by, for example, a system controller (not shown) according to user settings. Further, the determination can be made automatically according to the configuration of the device.

Channel 1/2 and channel 3/4
In this example, uncompressed audio data is always recorded in this example, and bit 3 of AUX0 and data D are

The value is [0]. Therefore, the interpolation unit 155 performs an interpolation process on normal audio data, and the output unit 156 performs a mute process only when necessary for normal audio processing.

The AUX data is recorded twice per editing unit (one field or one frame of video data). At the time of reproduction, the magnetic tape 123 runs at a higher speed than at the time of recording, and at the time of high-speed reproduction for reproduction, the rotary head 122 traces the track on the magnetic tape 123 obliquely. Therefore, since reproduction cannot be performed in edit units, the probability that AUX data can be detected is reduced.

In the case of such high-speed reproduction, particularly, when uncompressed audio data and compressed audio data are mixedly recorded in a recording area of a certain audio channel on one magnetic tape 123, Compressed audio data may be output where compressed audio data is to be processed. For example, the AU recorded in the recording area of the uncompressed audio data
The X data is read, and the AUX data is not read in the recording area of the compressed audio data.

In this embodiment, information indicating the type of data stored in the payload is recorded for the DID arranged for each sync block. That is,
Bit 3 of the DID records whether uncompressed audio data or other data, for example, compressed audio data, is stored. As described above, this DID is output from the ID interpolation unit 134 to the output unit 1.
56. Thus, even at the time of high-speed reproduction, the mute process can be instantaneously performed in the output unit 156 during the reproduction of the compressed audio data.

Reproduction encoder 201 and data decompression circuit 2
If the data decompression circuit 211 is linked to the data decompression circuit 211, the data decompression circuit 211 can be instantaneously switched on and off. At this time, the ON / OFF of the data decompression circuit 211 and the ON / OFF of the interpolation processing in the interpolation unit 155 are performed.
/ OFF is also controlled.

At the time of reproduction at normal speed, it is more preferable to determine the type of data using the data of AUX0. This is because the DID is the inner code corrected and the ID interpolation unit 13
This is because the AUX data, which has been subjected to outer code correction, is used.

In the above description, the recording medium is described as a magnetic tape, but this is not limited to this example.
In the present invention, a disk-shaped recording medium such as a hard disk or a magneto-optical disk can be applied as a recording medium.

In the above description, an example is described in which uncompressed audio data and compressed audio data are handled. However, the present invention is not limited to this example. For example, instead of compressed audio data, other binary data such as program data may be handled.

[0139]

As described above, according to the present invention, the data recorded in the recording area of each audio channel in the recording medium is uncompressed audio data for each editing unit. Information indicating whether the data is present or other data than audio, for example, compressed audio data is recorded. Therefore, even when a recording medium recorded in a system configuration that handles data other than audio is played back by a system that handles only audio, it is possible to prevent the non-audio, for example, compressed audio data from being output as it is. There is.

In one embodiment of the present invention, for each sync block, information indicating whether the data stored in the sync block is uncompressed audio data or data other than audio data. Has been recorded. Therefore, there is an effect that the output of the compressed audio data can be appropriately processed even in the case of high-speed reproduction or the like.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration on a recording side according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a reproducing side according to an embodiment of the present invention.

FIG. 3 is a diagram for describing an example of interpolation of audio data.

FIG. 4 is a schematic diagram illustrating an example of a track format.

FIG. 5 is a schematic diagram illustrating another example of a track format.

FIG. 6 is a schematic diagram illustrating a plurality of examples of a configuration of a sync block.

FIG. 7 shows an ID and a DID added to a sync block.
FIG.

FIG. 8 is a schematic diagram for explaining an output method of a video encoder and variable-length encoding.

FIG. 9 is a schematic diagram for explaining rearrangement of an output order of a video encoder.

FIG. 10 is a schematic diagram for explaining a process of packing data whose order is rearranged into a sync block.

FIG. 11 is a schematic diagram for explaining an error correction code for video data and audio data.

FIG. 12 is a schematic diagram illustrating an example of audio data to which an outer code parity has been added;

FIG. 13 is a schematic diagram illustrating an example of the content of each AUX data.

FIG. 14 is a schematic diagram illustrating an example of a configuration of an audio sector.

FIG. 15 is a schematic diagram illustrating an example of a format of audio data input to the recording / reproducing device.

FIG. 16 is a schematic diagram illustrating an example of transmitting non-audio data using a format of audio data.

FIG. 17 is a block diagram schematically showing a configuration of an example of an apparatus for performing processing when recording / reproducing audio data / non-audio data according to the present invention.

And FIG. 18 is a block diagram schematically showing a configuration of an example of a digital audio device according to the related art.

FIG. 19 is a schematic diagram illustrating a format of audio data based on the AES / EBU standard.

[Explanation of symbols]

100: recording / reproducing device, 114: AUX addition circuit, 116: outer code encoder, 117: shuffling, 118: ID addition circuit, 119: inner code encoder, 120 ... .SYNC addition circuit, 12
3 ... magnetic tape, 132 ... SYNC detection circuit,
133 ... inner code decoder, 134 ... ID interpolation circuit, 151 ... deshuffling circuit, 152 ... outer code decoder, 153 ... AUX separation circuit, 155
..Interpolation circuit, 156... Output unit, 200... Recording encoder, 201... Reproduction decoder, 210.
Data compression circuit, 211 ... data expansion circuit

Claims (13)

[Claims] 1. A recording apparatus for recording audio data and non-audio data in a common recording area of a recording medium, wherein at least one of the audio data and non-audio data is recorded in a predetermined recording area of the recording medium. The recording means, at the time of the recording, the data type information indicating whether the data recorded in the predetermined recording area is the audio data or the non-audio data, the audio data or the A recording apparatus characterized in that non-audio data is recorded for each editing unit. 2. The recording apparatus according to claim 1, wherein the audio data and the non-audio data are recorded on the recording medium in data units separated by a synchronization signal, and the data type information further includes:
A recording apparatus characterized by being recorded on the recording medium for each data unit. 3. A reproducing apparatus for reproducing a recording medium in which audio data and non-audio data are recorded in a common recording area, wherein the audio data and the non-audio data are recorded in a common recording area. And at least one of the non-audio data is recorded, and the data type information indicating which of the audio data and the non-audio data is recorded in the recording area is the audio data or the non-audio data. Reproducing means for reproducing a recording medium recorded for each data editing unit; output control means for controlling an output method of the audio data and the non-audio data reproduced by the reproducing means with reference to the data type information A playback device comprising: 4. The reproducing apparatus according to claim 3, wherein the output control means controls the output method so as to output silence for outputs of the audio data and the non-audio data. Playback device. 5. The playback device according to claim 3, wherein the audio data and the non-audio data are recorded on the recording medium in data units separated by a synchronization signal, and the data type information further includes:
The output method is further controlled by the output control means based on the data type information recorded on the recording medium for each data unit and reproduced by the reproduction means and recorded for each data unit. A reproducing apparatus characterized in that: 6. The reproduction apparatus according to claim 3, wherein the reproduction data reproduced by the reproduction means is subjected to an error correction process based on an error correction code added at the time of recording, and the error correction is performed by the error correction process. Error correction means for adding error information indicating that the error could not be corrected to the unsuccessful data; and an error of the audio data reproduced by the reproduction means based on the error information of the error correction means. Further comprising interpolation processing means for performing interpolation processing on certain data, based on the data type information and the error information, when it is determined that the error exists in the reproduced non-audio data, Controlling the interpolation processing means not to perform the interpolation processing on the error data. Raw equipment. 7. A recording / reproducing apparatus which records audio data and non-audio data in a common recording area of a recording medium and reproduces the audio data and non-audio data recorded on the recording medium. At least one of the non-audio data is input, and error correction means for performing error correction coding on the input data, and the audio data and the non-audio data which have been error correction coded by the error correction means are recorded. While recording in a predetermined recording area of the medium, at the time of the recording, data type information indicating whether the data recorded in the predetermined recording area is the audio data or the non-audio data is recorded in the audio data or the non-audio data. Record the above for each audio data edit unit Recording means for recording on the body; reproducing means for reproducing the audio data and the non-audio data recorded on the recording medium; and reproducing the data type information; and the audio data and the audio data reproduced by the reproducing means. An error that decodes the error correction encoding applied to the non-audio data, performs error correction, and adds error information indicating that an error could not be corrected to data that could not be corrected by the error correction processing. A recording / reproducing apparatus comprising: a correction unit; and an output control unit that controls a method of outputting the audio data and the non-audio data, the error of which has been corrected by the error correction unit with reference to the data type information. . 8. Recording video data error-correction-coded using a product code in a first recording area, recording audio data and non-audio data in a common recording area of a recording medium, and storing the data in a recording medium. In a video / audio recording / reproducing apparatus adapted to reproduce recorded audio data and non-audio data, an error correction code using a product code is applied to video data input together with the audio data and non-audio data. Video data recording means for performing recording, adding ID information and a synchronization signal to record in the first recording area, and inputting at least one of audio data and non-audio data, and performing error correction on the input data. Error correction means for performing coding, and error correction coding performed by the error correction means. The recorded audio data and the non-audio data are recorded in a second recording area of the recording medium different from the first recording area, and at the time of the recording, the data recorded in the second recording area are recorded. A data recording means for recording data type information indicating whether the audio data or the non-audio data is on the recording medium for each editing unit of the video data, and reproducing the video data recorded on the recording medium,
Video data reproducing means for decoding the reproduced video data based on the synchronizing signal and the ID information, based on the product code, and the audio data and the audio data recorded on the recording medium. Data reproducing means for reproducing the non-audio data and reproducing the data type information; decoding the error correction encoding applied to the audio data and the non-audio data reproduced by the data reproducing means to generate an error; Error correction means for performing correction, and adding error information indicating that the error could not be corrected to the data that could not be corrected by the error correction processing, and referring to the data type information, The error-corrected audio data and the non-audio data Video and audio recording and reproducing apparatus characterized by an output control means for controlling the force method. 9. The apparatus according to claim 7, wherein the output control means controls the output method so as to output silence for the output of the audio data and the non-audio data. A reproducing apparatus characterized by the above-mentioned. 10. The apparatus according to claim 7, wherein said audio data and said non-audio data are recorded on said recording medium in data units delimited by said synchronization signal, and said data type information Further refers to the data type information recorded on the recording medium for each data unit and reproduced by the data reproducing unit for each data unit, and further controls the output method by the output control unit. An apparatus characterized in that: 11. The apparatus according to claim 7, wherein an interpolation process is performed on data that is an error of the audio data reproduced by the reproduction unit, based on the error information of the error correction unit. The apparatus further comprises interpolation processing means, and when it is determined that the error exists in the reproduced non-audio data based on the data type information and the error information, the interpolation processing means An apparatus for performing control so that the interpolation processing is not performed. 12. A recording method for recording audio data and non-audio data in a common recording area of a recording medium, wherein the recording includes recording at least one of the audio data and non-audio data in a predetermined recording area of the recording medium. And at the time of the recording in the recording step, the data type information indicating whether the data recorded in the predetermined recording area is the audio data or the non-audio data, the audio data or the non-audio data. Recording the data for each editing unit. 13. A reproducing method for reproducing a recording medium in which audio data and non-audio data are recorded in a common recording area, wherein the audio data and the non-audio data are recorded in a common recording area. And at least one of the non-audio data is recorded, and the data type information indicating which of the audio data and the non-audio data is recorded in the recording area is the audio data or the non-audio data. A reproduction step of reproducing a recording medium recorded for each data editing unit; and an output for controlling an output method of the audio data and the non-audio data reproduced in the reproduction step with reference to the data type information. And control means. Raw way.