JPH06309784A - Recoiding method for digital voice signal - Google Patents

Abstract

PURPOSE:To obtain a recording method for a digital voice signal which is superior in capability for correcting and compensating an error and has an optimum shuffling method even when the number of synchronizing blocks per one track are a multiple of 3 and odd, in a digital VTR for ordinary use. CONSTITUTION:A track formed by a rotary head is divided into a video signal section and a sound signal section, a video signal is recorede using M tracks per one frame and digital voice signals of N channel are recorded using continuous M/N tracks successively. Also, a track of a digital voice signal section is divided into K pieces of synchronizing tracks, and L pieces out of K pieces are allotted to sound signal data, (K-L) pieces are allotted to parity data, and both arrays are combined. And M=10, N=2, K=14 or 15, L=9 are used for a video signal of a 525 system, M=12, N=2, K=14 or 15, L=9 are used for a video signal of a 625 system, then an optimum recording method in accordance with a video signal form of a digital sound voice is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital audio signal recording method for recording a digital audio signal together with a digital video signal by using a digital video tape recorder (hereinafter abbreviated as DVTR).

[0002]

2. Description of the Related Art In recent years, there has been a remarkable progress in digitization of audio / video equipment, one of which is DV.
There is TR. As a conventional DVTR digital audio signal recording method, for example, there is one disclosed in Japanese Patent Laid-Open No. 4-95274 filed by the inventor of the present invention.

A conventional digital audio signal recording method will be described below. FIG. 8 is a diagram showing a track structure for recording a conventional digital audio signal. In FIG. 8, 31 is a track to be recorded, and each track has a basic configuration of 32 preambles, 33 video signal parts, 34 edit gaps, 35 audio signal parts, 3
It consists of 6 postambles, and 35 audio signal parts are 1 in 5 or 6 consecutive tracks depending on the video signal format.
A recording area for audio signals for channels is configured.

In FIG. 9, as an example, 525 lines-60
A data shuffling method in an audio signal recording area corresponding to a field system (hereinafter abbreviated as 525 system) video signal is shown. This uses M tracks per frame of a video signal, sequentially records independent N channel digital audio signals for each continuous M / N track, and divides each track of the audio signal portion into K synchronization blocks. This corresponds to the case of M = 10, N = 2, K = 9, L = 6 in the digital voice signal recording method of the 525 system in which L of them are assigned to voice signal data and (K−L) are assigned to parity data. ing.

The operation of the conventional digital audio signal recording method configured as described above will be described below.
When the read signal is reproduced by the rotary head on the recording tracks configured as shown in FIGS. 8 and 9, a code error may occur on the same track or an adjacent track due to dropout. Also, if insert editing or the like of an audio channel is performed, code errors may increase in the tracks at both ends of the M / N track area.

For this reason, in the shuffling method of FIG. 9, adjacent samples of consecutive samples are not arranged on the same track, adjacent tracks, and both end tracks in one audio signal recording area, and the ability to correct uncorrectable data is improved. We are taking ways to raise it. With the above configuration, the digital audio signal recorded by using a plurality of tracks per channel has an appropriate correction / correction capability for an error caused by an edit and burst error.

[0007]

However, in the above-mentioned conventional configuration, since only an even value is presupposed as the value L of the number of synchronization blocks to which the audio data is shuffled, the value of L is not equal to other values in the track configuration. If so, it wasn't always appropriate. SUMMARY OF THE INVENTION It is an object of the present invention to provide a digital audio signal recording method having a shuffling method that is optimal when the number L of synchronization blocks is a multiple of 3 and is particularly odd.

[0008]

To achieve this object, a digital audio signal recording method of the present invention divides a track formed by a rotary head into a video signal portion and an audio signal portion, and the video signal is 1 In addition to recording using M tracks per frame, independent N channel digital audio signals are sequentially recorded for each continuous M / N track, and each track of the audio signal portion is divided into K synchronization blocks. L of them are assigned to audio signal data, and (KL) are assigned to parity data, and M = 10, N = 2, K = 14 or 15, and L = 9 for a video signal of 525 system,
For a video signal of 625 line-50 field system (hereinafter abbreviated as 625 system), M = 12, N = 2, K
= 14 or 15, L = 9, and when arranging digital audio signal data within a time period corresponding to one frame in an audio signal recording area having M / N tracks and L synchronization blocks per track, a video signal The optimum shuffling method according to the format is specified.

[0009]

According to the present invention, with the above-described structure, a digital audio signal recorded by using a plurality of tracks per channel has an optimum correction and correction capability with respect to an error caused by an editing or burst error, and a video signal together with a video signal. A digital audio signal can be recorded.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the digital audio signal recording method of the present invention will be described below with reference to the drawings. First, FIG. 2 shows the structure of a recording track used in the digital audio signal recording method of the present invention.

In FIG. 2, reference numeral 21 is a recording track formed by a rotary head, and one track is called a preamble of 22, a tracking control section called an ITI section of 23, a gap section of 24, and an index section of 25. Subcode recording section, 26 gap section, 27 audio signal section, 28 gap section, 29 video signal section, 3
It consists of 0 postamble part. The video signal has a video signal section 29 continuous in the tape running direction.
In the 625 system such as CAM, 12 frames are collected to form one frame for recording.

The audio signal has two channels in the above-mentioned television system, and the audio signal of each channel includes the audio signal portion 27 connected in the tape running direction to 5 in the 525 system.
In the 6-series and 625-series systems, 6 audio blocks are collectively formed and recorded. The configuration content of FIG. 2 is almost the same as that of the conventional example. In the digital audio signal recording method of the present invention in which the track structure is recorded as described above, the synchronous block structure around the 27 audio signal portions in one track will be described with reference to FIG.

FIG. 1 is a diagram showing the structure of a synchronization block in the audio signal section 27 in the first embodiment of the present invention.
In FIG. 1, 1 is an index part, 2 is a gap part,
3 is a sync signal (SYNC), 4 is an ID code, 5 is an audio signal data part, 6 is an AUX data part, 7 is an outer code, 8 is an inner code, 9 is a gap part, and 10 is a video signal part. This corresponds to the case of K = 14 and L = 9 in the conventional example.

The method of the first embodiment of the present invention configured as described above will be described below with reference to FIG.
The audio signal part provided between the gap part 2 and the gap part 9 is composed of 14 synchronization blocks, and is mainly composed of 9 audio signal data parts and 5 outer code parts. Each sync block has a sync signal 3 for establishing sync during playback.
(SYNC), an ID code 4 including a block address and the like, and an inner code 8 for error correction in the synchronization block.

The input digital voice signal is written in the voice signal data section 5, necessary auxiliary data is written in the AUX data section 6, and the outer code and the row code of both data arranged in a matrix are arranged in the column and row directions. An inner code is generated and added to form a recording block. Further, FIG. 1 exemplifies the number of synchronization blocks forming each unit and the number of bytes of each element forming the synchronization block, but of course the number is not limited to this, and the value of L is not limited to 9 in particular. Obviously, any other value may be used as long as it is a multiple of 3 and is an odd number.

Next, a shuffling method in the audio signal data section according to the first embodiment of the present invention will be described with reference to the drawings. 3 and 4 show the first part of the present invention.
FIG. 4 is a diagram showing a shuffling method in the embodiment of FIG. 3, FIG. 3 corresponds to the 525 system, and FIG. 4 corresponds to the 625 system. In FIG. 3, the horizontal direction shows the track configuration of the audio signal corresponding to one frame of the video signal, the track numbers 0 to 4 are the L channels of the stereo signal, and the track number 5 is
9 corresponds to the R channel of the stereo signal. Synchronous blocks are arranged in the vertical direction. Similar to FIG. 1, roughly divided into synchronous block numbers 0 to 8, audio signal data is arranged, and synchronous block numbers 9 to 13 are synchronous blocks including an outer code.
Then, the data of the audio signal part is divided into three, and 3n (n
Is an integer), a sequence of 3n + 1 (n is an integer) of an audio signal is arranged in the synchronization block numbers 3 to 5, and a sequence of 3n + 2 (n is an integer) of an audio signal is arranged in the synchronization block numbers 6 to 8. .

Further, the initial values of the respective series samples are separately arranged in the track direction so that the mutual distance becomes maximum,
That is, in each channel, the 3n sequence is arranged in the track direction with tracks 0 and 5, the 3n + 1 sequence from tracks 2 and 7, and the 3n + 2 sequence with tracks 4 and 9 as the initial positions.

Further, the data of each digital voice signal has the values shown in FIG. 3 as initial values, and thereafter (M / N) × L = 4.
The data is written in the order of the sampling time series at a period of 5 samples, and a synchronization block is constructed and recorded on the tape. In the case of the configuration example shown in FIG.
In the case of 6 bits, a maximum of 36 samples are recorded in one sync block.

FIG. 4 is similar to the configuration of FIG. 3, and since the number of tracks is 12 for the 625 system, the shuffling sequence is expanded to (M / N) × L = 54 sample periods, which is shown in FIG. Is different from. By using the first embodiment of the present invention configured as described above, when an audio signal is recorded using 5 tracks or 6 tracks connected per channel, both end tracks that may occur during editing are considered. It is possible to give a large interpolation length to the data loss of 0, that is, the track number 0 and 4 or 5 and 9 in the 525 system, and the track number 0 and 5 or 6 and 11 in the 625 system. .

Next, a second embodiment of the digital audio signal recording method of the present invention will be described with reference to the drawings. The structure of the track is the same as that in FIG. 2, and the synchronous block structure around the audio signal unit 27 in one track will be described with reference to FIG. In FIG. 5, 1 is an index part, 2 is a gap part, 3 is a synchronization signal (SYN).
C), 4 is an ID code, 5-1 and 5-2 and 5-3 are 3 respectively
Audio signal data parts 1, 2 and 3, 6 divided into equal parts
-1, 6, 2 and 6-3 are each divided into three equal parts, and AUX data parts 1, 2 and 3, 7-1 and 7-2 are each divided into two outer codes 1 and 2, 8 are inside. Reference numeral, 9 is a gap portion, 10
Is a video signal section. The configuration of these basic blocks is the same as in FIG. Moreover, these are K = in the conventional example.
This corresponds to the case of 15, L = 9.

The method of the second embodiment of the present invention configured as described above will be described below with reference to FIG.
The audio signal part provided between the gap part 2 and the gap part 9 is composed of 15 synchronization blocks, and is mainly composed of 9 audio signal data parts and 6 outer code parts. The 9 audio signal data parts are divided into 3 sets of 3 sync blocks each, and the 6 outer code parts are divided into 3 sets of 2 sync blocks so that the outer codes 1 and 2 are interpolated. Both are arranged alternately. As in the first embodiment, each synchronization block has a synchronization signal 3 (SYNC) for establishing synchronization at the time of reproduction, an ID code 4 including a block address, and an error correction for correcting an error in the synchronization block. The inner code 8 is added.

The input digital audio signal is written in the audio signal data sections 5-1 5-2 and 5-3, and the necessary auxiliary data is written in the AUX data sections 6-1 6-2 and 6-3. Then, an outer code and an inner code are generated and added from the column direction and the row direction of both data to form a recording block. Next, a shuffling method in the audio signal data section according to the second embodiment of the present invention will be described with reference to the drawings.

FIGS. 6 and 7 are views showing a shuffling method in the second embodiment of the present invention, and FIG.
7 corresponds to the 625 system. The basic data structure of shuffling is the same as that shown in FIGS. 3 and 4, but the arrangement position of the outer code part is different from that shown in FIGS. 6, the horizontal direction shows the track configuration of the audio signal corresponding to one frame of the video signal, the track numbers 0 to 4 correspond to the L channel of the stereo signal, and the track numbers 5 to 9 correspond to the R channel of the stereo signal. To do. The vertical direction is a synchronization block, and audio signal data is arranged in synchronization block numbers 0 to 2, 6 to 8 and 12 to 14, and a synchronization block including an outer code is arranged in synchronization block numbers 3 to 5 and 9 to 11. . Then, a sequence of 3n (n is an integer) in the sample sequence of the audio signal in the synchronous block numbers 0 to 2 and 3n + 1 (n is an integer) of the audio signal in the synchronous block numbers 6 to 8
, And 3n + 2 (n is an integer) series of audio signals are arranged in the synchronization block numbers 12 to 14.

Further, the initial values of each series of samples are separated and arranged in the track direction so that the mutual distance becomes maximum. That is, in each channel, the 3n sequence is arranged in the track direction with tracks 0 and 5, the 3n + 1 sequence from tracks 2 and 7, and the 3n + 2 sequence with tracks 4 and 9 as the initial positions.

Further, the data of each digital audio signal has the values shown in FIG. 6 as initial values, and thereafter (M / N) × L =
The synchronization blocks are written in the order of the sampling time series at a 45-sampling period, and the synchronization blocks are formed and recorded on the tape. In the case of the configuration example shown in FIG. 5, when the audio sample has 16 bits, a maximum of 36 is included in one synchronization block.
A sample is recorded.

FIG. 7 is the same as the configuration of FIG. 6, and is different from FIG. 6 in that the shuffling sequence is extended to 54 sample periods because the number of tracks is M = 12 for the 625 system. By using the second embodiment of the present invention configured as described above, when an audio signal is recorded using 5 tracks or 6 tracks connected per channel,
Interpolation is also possible for data loss on both ends of the track that may occur during editing, that is, track numbers 0 and 4 or 5 and 9 for the 525 series, and track numbers 0 and 5 or 6 and 11 for the 625 series. It becomes possible to have a large length.

Further, the sync block is divided into three equal parts, the data of 3n, 3n + 1, 3n + 2 are arranged in each of them, and the outer code sync block divided into two parts is inserted between them, so that it is large in the tape running direction. Even if dropout due to scratch occurs, for example, even if the data of 0 to 11 or 3 to 14 is lost in the sync block number, the remaining three audio signal sync blocks correct the data at every worst 3 samples. It is possible to realize a digital audio signal recording method which is capable of processing and has much higher correction and correction capability than the conventional example.

Further, in FIG. 3, FIG. 4, FIG. 6 and FIG.
As the data array for the sync block obtained by dividing the audio signal part into three, the data of the series of 3n, 3n + 1 and 3n + 2 are assigned in order from the top, but it is needless to say that they may be assigned in another order. In the figure, the array of data samples in one series of synchronization blocks is an array that circulates from left to right, but it goes without saying that this may be another array that is rotationally symmetric, for example. It is a thing.

In the above description of the embodiments of the present invention, the description has been made on the premise of the current television system called the 525 system and the 625 system.
Needless to say, if the number of channels N is simply doubled from M = 10 or 12, N = 2, and M = 20 or 24, N = 4, it can be directly applied to a high-definition television system such as high-definition television. Is.

[0030]

As described above, the present invention provides a suitable shuffling method in which the number of synchronization blocks in a recording track of an audio signal is a multiple of 3, and particularly even when it is an odd number. A digital audio signal recorded using a track can be recorded and reproduced with an optimum and maximum correction capability for errors caused by editing and burst errors, and its practical effect is large.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a configuration of a synchronization block around an audio signal portion in one track in a first embodiment of the present invention.

FIG. 2 is a pattern diagram showing a configuration of recording tracks used in the present invention.

FIG. 3 is a data block layout diagram showing a first embodiment of a shuffling sequence of a voice signal data part in the 525 system.

FIG. 4 is a data block layout diagram showing a first embodiment of a shuffling sequence of an audio signal data part in the 625 system.

FIG. 5 is a schematic diagram showing a configuration of a synchronization block around an audio signal portion in one track in the second embodiment of the present invention.

FIG. 6 is a data block layout diagram showing a second embodiment of the shuffling sequence of the audio signal data part in the 525 system.

FIG. 7 is a data block layout diagram showing a second embodiment of the shuffling sequence of the audio signal data part in the 625 system.

FIG. 8 is a pattern diagram showing a configuration of recording tracks used in a conventional example.

FIG. 9 is a data block arrangement diagram showing a shuffling sequence of an audio signal data section in a 525 system used in a conventional example.

[Explanation of symbols]

 1 Index part 2 Gap part 3 Sync signal (SYNC) 4 ID code 5 Audio signal data part 6 AUX data part 7 Outer code 8 Inner code 9 Gap part 10 Video signal part

Claims (5)

[Claims] 1. A track formed by a rotary head is divided into a video signal section and an audio signal section, the video signal is recorded using M tracks per frame, and independent N-channel digital audio signals are continuously recorded. Sequential recording is performed for each M / N track, and each track of the audio signal section is K
In the digital audio signal recording method in which the sync signal is divided into sync blocks, L of which are allocated to audio signal data and (K−L) is allocated to parity data, M = for a video signal of 525 line-60 field system. 10, N = 2, K
= 14, L = 9, and M = 12, N = 2, K = 14, L for a video signal of 625 lines-50 fields.
= 9, a digital audio signal recording method. 2. Digital audio data within a time corresponding to one frame period of a video signal is recorded in M / N tracks and 1
When shuffling to a region having L sync blocks per track, when L is a multiple of 3, the sync block region is divided into three equal parts and continuous audio is time-sequentially applied to each of the divided regions. Samples 3n, 3n + 1 and 3
Samples of each series of n + 2 (where n is an integer) are arranged, and the initial values of each series are arranged in the track direction so as to maximize the mutual distance, that is, 525 lines-
The values shown in (Table 1) for the 60-field system and (Table 2) for the 625 line-50-field system are used as the initial values of the samples to be arranged in each synchronization block, and thereafter, repeated arrays are performed at (M / N) × L sample periods. A digital audio signal recording method characterized by performing shuffling and recording. [Table 1] [Table 2] 3. A track formed by a rotary head is divided into a video signal section and an audio signal section, the video signal is recorded using M tracks per frame, and an N-channel digital audio signal is continuously recorded. / N tracks are sequentially recorded, and each track of the audio signal portion is divided into K synchronization blocks, of which L are audio signal data, (K
In the digital voice signal recording method of allocating L-number of parity data to parity data, if L is a multiple of 3, the sync block area of the voice signal data is divided into three equal parts, and (K−L) parity data is further divided. Of the synchronization block area of the audio signal data divided into three equal parts, and each area of the synchronization block of the parity data divided into two is inserted and recorded between the areas of the synchronization block of the audio signal data. Characteristic digital audio signal recording method. 4. A method of shuffling audio signal data, which is divided into three equal parts, into a synchronous block area as a shuffling method.
4. The digital audio signal recording method according to claim 3, wherein the same method as the shuffling method described in [3] is used. 5. M = 10, N = 2, K = 15, L = 9 for a video signal of 525 line-60 field system, and M = for a video signal of 625 line-50 field system. 4. The digital audio signal recording method according to claim 3, wherein 12, N = 2, K = 15 and L = 9.