JP2738257B2 - Digital audio signal recording method and recording apparatus - Google Patents

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 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 digitalization of audio / video equipment.
There is TR. As a conventional DVTR digital audio signal recording method, for example, there is a method disclosed in Japanese Patent Application Laid-Open No. 4-95274 filed by the inventor of the present invention.

[0003] A conventional digital audio signal recording method will be described below. FIG. 8 is a diagram showing a conventional track configuration for recording a digital audio signal. In FIG. 8, reference numeral 31 denotes a track to be recorded, and each track has a basic structure of 32 preambles, 33 video signal portions, 34 edit gaps, 35 audio signal portions, 3
6 postambles, and 35 audio signal portions are 1 in 5 or 6 consecutive tracks depending on the video signal format.
The recording area of the audio signal for the channel is configured.

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

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

For this reason, in the shuffling method shown in FIG. 9, adjacent samples of continuous samples are not arranged on the same track, adjacent track, and both end tracks within one audio signal recording area, and the ability to correct uncorrectable data is improved. We take a way to increase it. With the above configuration, a digital audio signal recorded using a plurality of tracks per channel has a configuration capable of appropriately correcting and correcting errors caused by editing and burst errors.

[0007]

However, in the above-described conventional configuration, only the even value is assumed as the value L of the number of synchronous blocks in which the audio data is shuffled, so that the value of L is set to another value in the track configuration. Was not always appropriate. SUMMARY OF THE INVENTION An object of the present invention is to provide a digital audio signal recording method having a shuffling method which is optimal when the number of synchronous blocks L is a multiple of 3 and is particularly an odd number.

[0008]

In order to achieve this object, a digital audio signal recording method according to 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 one. M tracks per frame (M
Is recorded using a natural number), digital audio signals of independent N channels (N is a natural number) are sequentially recorded on successive M / N tracks (M / N is a natural number) for each channel, and an audio signal portion is recorded. Are divided into K (K is a natural number) synchronous blocks, and L (L is K
> L and an odd multiple of 3) for the audio signal data, (K−
L) A digital audio signal recording method to allocate pieces to the parity data, the digital audio signal in the time corresponding to one frame period of the video signal, shuffling in a region having a L · M / N number of sync blocks In doing so, L
M / N synchronization blocks are divided into three in the head scanning direction , and 3n, 3n + 1, and 3n + 2 of audio samples that are time-sequentially continuous in each of the divided regions (where n is an integer)
Are arranged in the tape running direction so that the mutual distance is maximized.

[0009]

According to the present invention, a digital audio signal recorded by using a plurality of tracks per channel can be combined with a video signal while having an optimum correction correction capability against errors caused by editing and burst errors. Digital audio signals can be recorded.

[0010]

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

In FIG. 2, reference numeral 21 denotes a recording track formed by a rotary head. One track includes a preamble 22, a tracking control unit 23 called an ITI unit, a gap unit 24, and an index unit 25. Sub-code recording section, 26 gap section, 27 audio signal section, 28 gap section, 29 video signal section, 3
It consists of a postamble part of 0. The video signal is a video signal portion 29 continuous in the tape running direction.
625 line-50 field system such as CAM (hereinafter, 6
Abbreviated as 25 series. In (1) , 12 frames are collected to form and record one frame.

The audio signal has two channels in the above-mentioned television system, and the audio signal of each channel is composed of an audio signal section 27 connected in the tape running direction and 5 in the case of the 525 system.
In the case of the book and the 625 system, one audio block is composed and recorded together in six lines. The configuration of FIG. 2 is substantially the same as the conventional example. In the digital audio signal recording method according to the present invention, which is recorded in the above-described track configuration, a synchronous block configuration around 27 audio signal portions in one track will be described with reference to FIG.

FIG. 1 is a diagram showing a configuration of a synchronization block in the audio signal unit 27 in the first embodiment of the present invention.
In FIG. 1, 1 is an index portion, 2 is a gap portion,
3 is a synchronization signal (SYNC), 4 is an ID code, 5 is an audio signal data portion, 6 is an AUX data portion, 7 is an outer code, 8 is an inner code, 9 is a gap portion, and 10 is a video signal portion. This corresponds to the case where 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 section provided between the gap section 2 and the gap section 9 is composed of 14 synchronous blocks, and is mainly composed of 9 audio signal data sections and 5 outer code sections. Each synchronization block has a synchronization signal 3 for establishing synchronization during reproduction.
(SYNC), an ID code 4 including a block address and the like, and an inner code 8 for error correction in the synchronous block.

The input digital audio signal is written into the audio signal data section 5, and necessary auxiliary data is written into the AUX data section 6, and the outer code and the outer code of the two 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. FIG. 1 illustrates the number of synchronous blocks constituting each part and the number of bytes of each element constituting a synchronous block. However, the present invention is not limited to this, and the value of L is not particularly limited to nine. It is clear that other values may be used as long as they are multiples of 3, especially odd numbers.

Next, a method of shuffling 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 embodiment of the present invention.
FIG. 3 is a diagram showing a shuffling method in the embodiment of FIG. 3, wherein FIG. 3 corresponds to the 525 system and FIG. In FIG. 3, the horizontal direction shows the track configuration of the audio signal corresponding to one frame of the video signal, where track numbers 0 to 4 correspond to the L channel of the stereo signal, and track numbers 5 to 5.
9 correspond to the R channel of the stereo signal. Synchronous blocks are arranged in the vertical direction. Broadly as in FIG. 1, audio signal data is arranged in synchronous block numbers 0 to 8, and synchronous blocks including outer codes are arranged in synchronous block numbers 9 to 13.
Then, the data of the audio signal portion is divided into three, and 3n (n
, A sequence of 3n + 1 (n is an integer) of audio signals is arranged in synchronous block numbers 3 to 5, and a sequence of 3n + 2 (n is an integer) of audio signals is arranged in synchronous block numbers 6 to 8. .

The initial value of each series sample is tape running.
In each direction , the distance between them is set to be maximum, that is, in each channel, the sequence of 3n is from tracks 0 and 5, the sequence of 3n + 1 is from tracks 2 and 7, and the sequence of 3n + 2 is track 4 And 9 as the initial position, the tape is circulated in the tape running direction .

Further, the data of each digital audio signal has the values shown in FIG. 3 as initial values, and thereafter (M / N) × L = 4
Writing is performed in the order of sampling time series at a period of 5 samples, and a synchronous block is formed 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 synchronization block.

FIG. 4 is similar to the configuration of FIG. 3 except that the number of tracks is set to 12 for the 625 system, so that the shuffling sequence is extended to (M / N) × L = 54 sample periods. And different. By using the first embodiment of the present invention configured as described above, when recording an audio signal using five or six tracks concatenated per channel, both-end tracks that may occur at the time of editing are considered. , That is, track numbers 0 and 4, or 5 and 9 in the 525 system, and track numbers 0 and 5 or 6 and 11 in the 625 system can have a large interpolation length. .

Next, a digital audio signal recording method according to a second embodiment of the present invention will be described with reference to the drawings. The configuration of the track is the same as that of FIG. 2, and the configuration of a synchronous block around the audio signal unit 27 in one track will be described with reference to FIG. In FIG. 5, 1 is an index portion, 2 is a gap portion, and 3 is a synchronization signal (SYN).
C), 4 is ID code, 5-1, 5-2 and 5-3 are 3 each
Audio signal data parts 1, 2 and 3, 6 equally divided
-1, 6-2 and 6-3 are AUX data parts 1, 2 and 3, each of which is divided into three equal parts, 7-1, 7-2 are each divided into two outer codes 1 and 2, and 8 are inner parts. Reference numeral 9 denotes a gap portion, 10
Denotes a video signal unit. The configuration of these basic blocks is the same as in FIG. In addition, these are K =
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 section provided between the gap section 2 and the gap section 9 is composed of 15 synchronization blocks, and is mainly composed of 9 audio signal data sections and 6 outer code sections. The nine audio signal data parts are divided into three sets of three synchronous blocks each of three, and the six outer code parts are divided into two sets of synchronous blocks each of three so that outer codes 1 and 2 are interpolated. Are alternately arranged. 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 the like, and an error code 3 for correcting errors in the synchronization block. An inner code 8 is added.

The input digital audio signal is written in the audio signal data portions 5-1, 5-2 and 5-3, and the necessary auxiliary data is written in the AUX data portions 6-1 and 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 method of shuffling 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 show a shuffling method according to the second embodiment of the present invention.
FIG. 7 corresponds to the 625 system. The basic data structure of shuffling is the same as in FIGS. 3 and 4, except that the arrangement position of the outer code part is different from FIGS. In FIG. 6, the horizontal direction shows the track configuration of the audio signal corresponding to one frame of the video signal, with track numbers 0 to 4 corresponding to the L channel of the stereo signal and track numbers 5 to 9 corresponding to the R channel of the stereo signal. I do. The vertical direction is a synchronous block, and audio signal data is arranged in synchronous block numbers 0 to 2, 6 to 8 and 12 to 14, and synchronous blocks including outer codes are arranged in synchronous block numbers 3 to 5 and 9 to 11. . Then, 3n (n is an integer) sequence of audio signal sample sequences in synchronous block numbers 0 to 2 and 3n + 1 (n is an integer) of audio signal in synchronous block numbers 6 to 8
And 3n + 2 (n is an integer) sequences of audio signals are arranged in the synchronous block numbers 12 to 14.

The initial value of each series sample is a tape run.
They are separated in the row direction so that the distance between them is maximized. That is, in each channel, the sequence of 3n is from tracks 0 and 5, and the sequence of 3n + 1 is track 2
7 and 7 and the 3n + 2 series are configured to circulate in the tape running direction with tracks 4 and 9 as initial positions.

Further, the data of each digital audio signal has the values shown in FIG. 6 as initial values, and (M / N) × L =
The data is written in the order of sampling time series at 45 sample periods to form a synchronous block, which is recorded on the tape. In the configuration example shown in FIG. 5, when the audio sample is 16 bits, a maximum of 36
A sample is recorded.

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

Further, the synchronous block is divided into three equal parts, data of 3n, 3n + 1, and 3n + 2 are arranged in each of them, and two divided outer code synchronous blocks are inserted between them, thereby increasing the size in the tape running direction. Even if a dropout due to scratch occurs, for example, even if data of 0 to 11 or 3 to 14 is lost in the synchronous block number, correction is performed with data of every three samples at worst by the remaining three audio signal synchronous blocks. The digital audio signal recording method is capable of processing and has a much higher correction / correction capability than the conventional example.

3, FIG. 4, FIG. 6, and FIG.
As a data array for a synchronous block obtained by dividing the audio signal portion into three, data of a sequence of 3n, 3n + 1 and 3n + 2 are allocated in order from the top, but it is needless to say that data may be allocated in another order. In the figure, the array of data samples in one series of synchronous blocks is an array that circulates from left to right. However, it is needless to say that another array, for example, a rotationally symmetric array may be used. Is the thing.

In the above description of the embodiment of the present invention, the description has been made on the assumption that the current television system is called the 525 system and the 625 system.
If the number of channels N is simply doubled from M = 10 or 12, N = 2 and M = 20 or 24, N = 4, it goes without saying that the present invention can be applied to a high definition television system such as high definition. It is.

[0030]

As described above, the present invention provides an appropriate shuffling method even when the number of synchronous blocks in a recording track of an audio signal is a multiple of 3, especially an odd number, thereby providing a plurality of synchronous blocks per channel. A digital audio signal recorded using a track can be recorded and reproduced with an optimum and maximum correction correction capability against errors caused by editing and burst errors. large.

[Brief description of the drawings]

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

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

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

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

FIG. 5 is a schematic diagram showing a configuration of a synchronous block around an audio signal section in one track according to a 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 a recording track used in a conventional example.

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Index part 2 Gap part 3 Synchronization 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 (8)

(57) [Claims] 1. A track formed by a rotary head is divided into a video signal portion and an audio signal portion, and a video signal is recorded using M tracks (M is a natural number) per frame and independent N channels (M is a natural number). (N is a natural number) digital audio signals are sequentially recorded on M / N tracks (M / N is a natural number) continuous for each channel, and each track of the audio signal section is composed of K (K is a natural number) synchronous blocks. A digital audio signal recording method in which L (L is K> L and an odd multiple of 3) is allocated to audio signal data, and (KL) are allocated to parity data, head digital audio signal in the time corresponding to one frame period, when shuffling a region having a L · M / N number of sync blocks, said L · M / N number of sync blocks of It was divided into three 査direction, 3n of chronologically consecutive speech samples in each divided region is, 3n
+1 and 3n + 2 (where n is an integer) samples of each series, and the initial value of each series is spaced apart in the tape running direction so as to maximize the mutual distance. Signal recording method. 2. A track formed by a rotary head is divided into a video signal portion and an audio signal portion, and the video signal is M tracks per frame (M is 525 lines-60 fields video signal). M = 10, M = 12 for a 625 line-50 field video signal, and independent N channels (N =
The digital audio signal of 2) is continuously transmitted for each channel by M
/ N tracks are sequentially recorded, and each track of the audio signal section is divided into K (K is a natural number of K> 9) synchronous blocks, and nine of them are audio signal data, and (K-9)
A digital audio signal recording method for allocating digital audio signals to parity data, wherein the digital audio signal within a time corresponding to one frame period of the video signal is shuffled into an area having 9 · M / N synchronization blocks. , M = 10, the values shown in Table 1 are used as initial values of the arrangement of samples to be arranged in each synchronous block when M = 12, and the values shown in (Table 2) are used as M · M / 12. A digital audio signal recording method characterized by repetitively arranging and shuffling and recording at N sample periods. [Table 1] [Table 2] 3. The digital audio signal recording method according to claim 1, wherein K = 14. 4. In the case of a high definition television system, M
4. The digital audio signal recording method according to claim 1, wherein N = 4 and N = 4. 5. A track formed by a rotary head is divided into a video signal portion and an audio signal portion, and a video signal is recorded using M tracks (M is a natural number) per frame, and independent N channels (M is a natural number). (N is a natural number) digital audio signals are sequentially recorded on M / N tracks (M / N is a natural number) continuous for each channel, and each track of the audio signal section is composed of K (K is a natural number) synchronous blocks. A digital audio signal recording apparatus for allocating and recording L (where L is K> L and an odd multiple of 3) audio signal data and (KL) parity data, wherein L is an odd multiple of 3; When shuffling a digital audio signal within a time corresponding to one frame period of the video signal to an area having LM / N synchronization blocks, the LM / N synchronization blocks are shuffled. Divided into three parts in the head scanning direction, 3n of chronologically consecutive speech samples in each divided region is, 3n
+1 and 3n + 2 (where n is an integer) samples of each series are arranged, and the initial value of each series is arranged and recorded in the tape running direction so as to maximize the mutual distance. Digital audio signal recording device. 6. A track formed by a rotary head is divided into a video signal portion and an audio signal portion, and the video signal is M tracks per frame (M is 525 lines-60 fields video signal). M = 10, M = 12 for a 625 line-50 field video signal, and independent N channels (N =
The digital audio signal of 2) is continuously transmitted for each channel by M
/ N tracks are sequentially recorded, and each track of the audio signal section is divided into K (K is a natural number of K> 9) synchronous blocks, and nine of them are audio signal data, and (K-9)
A digital audio signal recording apparatus for allocating digital audio signals to parity data and recording the digital audio signals in a time corresponding to one frame period of the video signal in an area having 9 · M / N synchronization blocks. At the time of ringing, when M = 10, the value shown in (Table 3) is used, and when M = 12, the value shown in (Table 4) is used as an initial value of arrangement of samples to be arranged in each synchronous block. A digital audio signal recording device characterized by repeating arrangement at M / N sample periods, shuffling and recording. [Table 3] [Table 4] 7. The digital audio signal recording apparatus according to claim 5, wherein K = 14. 8. In the case of a high definition television system, M
8. The digital audio signal recording apparatus according to claim 5, wherein N = 4 or N = 4.