JP2633556B2 - Recording method of audio data in rotary head type video tape recorder - Google Patents

Description

Description: Object of the Invention (Industrial application field) The present invention relates to a rotary head type video tape recorder for recording and reproducing at least one of a video signal and an audio signal, and particularly to audio. It relates to a data recording method.

(Prior art) A digital VTR in which a digital video signal is recorded and reproduced by a helical track on a magnetic tape by a rotary head is used as a recording method of an audio signal in a track provided separately in a longitudinal direction of the tape. First thought. However, especially for professional digital
Considering the VTR, there are demands for the audio signal to be of high quality, to have little deterioration due to dubbing, and to be able to record a multi-channel audio signal, and it is desirable that the audio signal be digitized and recorded on a helical track.

A digital audio signal has a lower allowable error rate than a video signal, and it is particularly necessary to avoid overlooking an error. However, in a digital VTR, the recording density tends to be extremely high in order to suppress the tape consumption, and the error rate of the reproduced data necessarily increases. Also,
The nature of the errors is also random, mainly due to noise,
Both burst errors due to scratches and dust on the tape occur. Therefore, error correction and error correction are indispensable. The configuration of the error correction code is to reduce the residual error rate as a form of a product code generally configured as a double with an outer code and an inner code,
Be able to correct both random and burst errors. Further, when an uncorrectable error occurs, a correction is performed by replacing the uncorrectable error with a value obtained from a nearby correct sample value.
At this time, data is rearranged (shuffled) in advance so that adjacent samples are separated from each other on the tape and recorded. Generally, a continuous signal is divided into even and odd samples every other signal. Often, each group is recorded on a tape at a separated position. It goes without saying that error correction and error correction are also performed on the video signal.

In a commercial digital VTR, editability of video and audio signals is important. The video signal and the audio signals of a plurality of channels must all be independently editable. The minimum editing unit of a video signal is generally one field, whereas the minimum editing unit of an audio signal is 1/5 frame (about 6.7 msec).
It is required that: Therefore, the error correction processing and shuffling of the audio signal must be completed within this range. In addition, the timing between the video signal and the audio signal needs to be kept constant between input and output (before recording and after reproduction).

At present, there is a D-1 format recommended by CCIR as a digital VTR standard for business use. The D-1 standard is described in the document "Proposed American Nfticnal Standard SMPT
E 224M, 225M, 226M, 227M, 228M "(for example, SMPTE Journ
al pp. 359-396, published in March 1986), and the gist and background are described in, for example, the document "Standardization of Digital VTR in CCIR" (NHK Giken Monthly Report, pp. 138-145, April 1986). ing. Below, the digital VTR
An outline of the D-1 standard will be described as a conventional example of the audio recording method in the above. Here, the NTSC system (525 lines / frame, 29.97 frames / second) is described.

The D-1 format digital VTR records and reproduces an 8-bit component signal in which a luminance signal is sampled at 13.5 MHz and two color difference signals are sampled at 6.7 MHz each as a video signal. If such a signal is directly recorded as one signal, the data rate becomes extremely high.
By dividing and recording data in channels, 1
The data rate per channel is reduced. Next, the audio signal has a sampling frequency of 48 kHz and the maximum number of quantization bits.
Four independent 20-bit channels (referred to as audio channels to avoid mixing with recording channels)
Signal.

FIG. 9 shows the tape format. Magnetic tape 501
On one helical truck 502 formed above, 503a, 503b are video sectors, 504a, 504b, 504c, 504d.
Is an audio sector, which is a recording area for a video signal and an audio signal, respectively. Edit gaps 505a, 505b, 505c, 505d, 505e are provided between each sector,
The blank portion allows the video signal and the audio signal of the four audio channels to be independently edited. Recording the audio signal in the center of the track in this way is because the audio data has a higher error rate requirement than the video data as described above. This is for arranging the data area. Note that an analog audio signal, a control signal, and a time code signal are recorded on the cue audio track 506, the control track 507, and the time code track 508, respectively. Next, the arrangement of the video signal and the audio signal of one frame on the tape is shown in FIG. In this figure, for simplicity, four audio sectors on one track are combined into one, and the edit gap is also omitted. The video signal is processed in units of a segment composed of 1/5 field (50 lines) data. The numbers shown in the respective video sectors in FIG. 10 represent the segment numbers. One segment of data is divided into four sectors, and one sector is a recording unit as a video sector. For example, video sectors 601, 602, 603, 604 are respectively the 0th sector of the 0th field, the 0th segment,
The first sector, the second sector, and the third sector are shown. One frame of video signal is recorded in the 40 video sectors (20 tracks) shown in the figure. The processing unit of the audio signal is 1/5 frame (two segment periods), which corresponds to four tracks. The hatched diagram 605 is the second in the 0th field.
FIG. 4 shows a portion for recording an audio signal related to the segment / third segment.

FIG. 11 is an enlarged view of the audio signal recording portion. Since the audio signal has an extremely small amount of information and a short editing unit time as compared with the video signal, the area where the audio signal is recorded is inevitably considerably smaller than the area where the video signal is recorded. Shuffling cannot be expected to be effective enough. Therefore, it is quite possible that one or more audio sectors will be completely unplayable if a long burst error occurs due to tape scratches, dust, etc. To alleviate this effect, the D-1 format employs double recording in which audio data is divided into even-numbered samples and odd-numbered samples and placed in separate audio sectors, and two identical audio sectors are provided. . In the symbols written in the audio sector in FIG. 11, the first digit indicates the audio channel number, and the second letter indicates the even-odd sample (E is an even-numbered sample, O is an odd-numbered sample). For example, audio sector 701a, 7
01b, 701c, and 701d are audio sectors of the even sample of the audio channel 1, the odd sample of the audio channel 4, the even sample of the audio channel 3, and the odd sample of the audio channel 2, respectively. Of the 16 audio sectors of 4 tracks corresponding to 1/5 frame, two audio sectors belonging to one audio channel include even numbered samples and two odd numbered samples. If the audio sector of the even-numbered sample and the audio sector of the odd-numbered sample can be reproduced one by one (within an error-correctable range), the complete sound can be reproduced, and any one audio can be reproduced. If the sector can be reproduced, it is possible to reproduce sound that has been sufficiently corrected in terms of audibility.
Another advantage of adopting the dual recording method is that overlap editing is possible. This means that, at the time of editing, near the editing point, a signal that continues from before the editing point is recorded on one of the same audio channels, and the signal that continues after the editing point is recorded on the other, and can be continued during reproduction. Things.

Next, the contents of the audio sector will be described in more detail. Since one audio sector is half of the audio signal of 1/5 frame (about 1/150 second), 160 to 161
Word (1 word is 20 bits). This is called W _{0 to} W ₁₆₀
Then, the error correction code configuration of one sector data is
It looks like Figure 12. First, the outer code is formed in the vertical direction in units of one symbol (one symbol is 4 bits), and three check symbols are added to seven symbols to form outer code check data 801 (shaded portion falling left). The figure shows the arrangement after shuffling. Further, the inner code is formed in a horizontal direction in units of 1 byte, and 4 bytes of check bytes are added to 60 bytes (24 words) to form inner code check data 802 (hatched portion at the lower right). Reference numeral 803 denotes additional data associated with the audio sector, which is error-correction-coded like audio data. Note that a strong code called a Reed-Solomon code is used as the error correction code. When one sample is quantized with less than 20 bits, additional data is recorded in the remaining lower bits of each word.

The data configured as shown in FIG. 12 is recorded in units of a synchronous block having a predetermined length. FIG. 13 shows the configuration of this synchronization block. The synchronization block is 134 bytes long. The first two bytes are a synchronization signal 901, the next four bytes are an identification signal and its parity data 902, and an inner code block 903, 904 of 64 bytes each. In the inner code block, 903a and 904a are data, and 903b and 904b are check bytes, which correspond to the inner code in FIG. Therefore, one audio sector is recorded as five synchronization blocks. The structure of the inner code in the video sector is the same as that in the case of the audio, and is also recorded in units of the synchronization block in FIG. Recording / reproduction is performed in units of synchronization blocks as described above. Even if data can be reproduced only discontinuously due to long burst errors or special reproduction (slow, high-speed search, etc.), correct processing can be performed by the identification signal. That's why.

FIG. 14 shows an operation time chart for each head. In this figure, four heads are arranged at 90 ° intervals on the drum, the tape wrap angle is 258 °, and the drum rotation speed is 5 rotations /
This shows the case of a frame. For example, with regard to head A, 1001a, 1001b, 1001c, 1001d, 1001e, and 1001f each record (or reproduce) a video sector,
1002a, 1002b, and 1002c are times for recording (or reproducing) audio sectors, respectively, and do not record (or reproduce) any other time. Two consecutive segments of video data (corresponding to 8 video sectors) are recorded (or played back) for each head at the time of the lower right shaded area 1003
Then, the audio data related to the two segments is recorded (or reproduced) at the time of the diagonally shaded area 1004 at the lower left. Since the signal corresponding to the vertical blanking period is not recorded in the original video data, the video data and the audio data do not completely coincide with each other in time. As is clear from FIG. 14, the video signal and the audio signal undergo processing such as error correction coding and shuffling at the time of recording, as well as delay and compression for each head, and the reverse processing at the time of reproduction.

However, as described above, the conventional digital
The VTR audio recording system has the following problems. As described above, an audio signal has a property that is more vulnerable to a data error than a video signal. However, the information amount of the audio signal is much smaller than the information amount of the video signal, and the minimum editing unit is also smaller. Therefore, audio data within a predetermined editing unit period is concentrated and recorded in a narrow area on the tape. In the D-1 format, double recording and separation of even / odd samples are performed to alleviate this, but that is not sufficient. If there is a scratch or dust on the tape larger than a certain area, the burst error caused by this will make it impossible to reproduce sufficient correct data from all the related audio sectors, and the quality of the reproduced audio signal is likely to be significantly degraded. . Such a problem always occurs in a digital VTR in which an audio signal is recorded on a part of a helical track, not limited to the D-1 format digital VTR.

(Problems to be Solved by the Invention) As described above, when a digital audio signal is recorded on a helical track in the conventional digital VTR, the audio data is much smaller than the video data, and the processing unit is smaller. There is a problem that audio data belonging to a predetermined period is intensively recorded in a very small area on the tape, and the quality of a reproduced audio signal is significantly degraded due to a burst error caused by scratches or dust on the tape. .

An object of the present invention is to record an audio signal belonging to a predetermined period by dividing the audio signal into a plurality of discrete track groups,
An object of the present invention is to provide a method of recording audio data in a rotary head type video tape recorder which does not perform complicated processing and reduces the possibility of deterioration of a reproduced audio signal due to a burst error caused by a scratch or dust on a tape.

[Structure of the Invention] (Means for Solving the Problems) In order to solve the above problems, the present invention provides a recording area for video data and a recording area for digitized audio data on a single track. In a rotary head type video tape recorder that records and reproduces audio data, a recording area of audio data belonging to a predetermined period when recording audio data is divided into first (N + M) tracks out of adjacent (N + M) tracks.
, And (N−) from the (M + 1) th line from the first side.
M) and the (N + K + 1) th book from the first side (M−
K) N total (where M and K are 2 ≦ M ≦ N, 1 ≦ K ≦ M−
Meet 1. ) Are recorded on the tracks in a distributed manner.

(Operation) The audio data is processed in units of data of a predetermined period (for example, the minimum editing unit). In the present invention, if a predetermined area on the helical track is provided with a recording area for digitized audio data and recorded, and the audio data for the predetermined period corresponds to an audio recording area for N tracks, The audio data is recorded by distributing the areas on predetermined N tracks of (N + M) adjacent tracks. As a result, the recording area on the tape is effectively increased, and the possibility that data in these recording areas are simultaneously damaged by a burst error is reduced.

The conditions for selecting N from the (N + M) tracks are to maximize the variance of the recording area and to match the track where the recording area for the preceding and succeeding audio data is provided,
(N + M) tracks are divided into five track groups.
K, (M−K), (N−M), K
And (M−K) tracks. Of these, the recording area of the audio data for the predetermined period is provided by the K tracks of the first track group and the (N) of the third track group.
−M) and (M−K) of the fifth track group on a total of N tracks. In other words, K lines from the first side, (M + 1) lines from the (M + 1) th line from the first side, and (MK) lines from the (N + K + 1) th line from the first side. There are a total of N trucks. The second track group (M-
K) A part of the audio data of the immediately preceding period (corresponding to the fifth track group) is added to the K track of the fourth track group.
A part of the audio data for the next period (corresponding to the first track group) is recorded on each track. By arranging the recording area of the audio data not included in the predetermined period in the second track group and the fourth track group in this manner, the distance between the first, third, and fifth track groups is increased. , Are more resistant to burst errors than in the case where recording is performed on N consecutive tracks. In addition, since the number of tracks of the second and fifth track groups and the number of tracks of the fourth and first track groups are made equal, the recording area arrangement method becomes exactly the same for each audio processing unit. Here, considering the conditions for M and K, the first, second, and
4. Since the fifth track group includes at least one or more tracks, and the third track group includes zero or more tracks, 1 ≦ K, 1 ≦ (M−K), 0 ≦ (N−M) holds, and 2 ≦ M ≦ N 1 ≦ K ≦ M−1 is obtained. Note that the third track group may be omitted, and in this case, N = M.

As described above, the recording area of the audio data belonging to the predetermined period is changed from the adjacent (N + M) tracks to K tracks from the first side and from (M + 1) tracks from the first side to (N−M)
M) and (N−K + 1) th from the first side (M−
K) N total (where M and K are 2 ≦ M ≦ N, 1 ≦ K ≦ M−
Meet 1. By arranging and recording on the track of (2), audio data for a predetermined period is effectively recorded on a wide area on the tape, and the possibility of deterioration of audio quality due to a burst error is reduced. The area arrangement method becomes the same pattern for each audio processing unit.

(Example) Hereinafter, an example will be described in detail.

First, an embodiment in which the present invention is applied to a method of recording audio data in a D-1 format digital VTR will be described. FIG. 1 shows an arrangement of a video signal and an audio signal of one frame on a tape in this embodiment. FIG. 1 is basically the same as FIG. 10, except that an audio sector is provided at the center of each track, and the numbers shown in each video sector represent segment numbers. The audio signal is basically processed in the same manner as in the D-1 format, except for the recording position on the tape. Shaded area 10
Reference numeral 1 denotes a part for recording 1/5 frame (minimum editing unit) related to the second segment and the third segment of the 0th field, that is, the audio data for a predetermined period. Tenth
In the figure, this is recorded on four consecutive tracks, but in this embodiment, it is recorded on a total of four tracks of the first, third, fourth and sixth out of six consecutive tracks. This is N = 4,
This corresponds to the case of M = 2, K = 1, which means that the information originally concentrated on the four tracks is effectively dispersed in the range of the six tracks.

FIG. 2 is an enlarged view of an audio signal recording portion of the embodiment of FIG. The symbols in each audio sector have the same meaning as in FIG. 11, and indicate the audio channel number and the difference between even and odd samples. Compared to FIG. 11, the distance on the tape between the four audio sectors of the same audio channel is larger. A part of the audio data related to the 0th and 1st segments of the 0th field is recorded in the audio sectors 201a, 201b, 201c and 201d, and the 4th segment of the 0th field and the 0th segment of the 1st field are related. Part of the audio data is in the audio sectors 202a, 202b, 20
Recorded in 2c, 202d.

FIG. 3 is an operation time chart for each head in the embodiment of FIG. This figure also shows a case where four heads are arranged at 90 ° intervals on the drum, the tape wrap angle is 258 °, and the number of rotations of the drum is 5 rotations / frame, similarly to FIG. The video data of two consecutive segments is recorded (or reproduced) for each head at the time of the lower-sloping hatched portion 301, and the audio data related to the two segments is recorded (or reproduced) at the time of the lower-left diagonal shading 302. )
Is done. In comparison with FIG. 14, the sound recorded (or reproduced) by the head A has a form in which the data is recorded (or reproduced) just one revolution earlier. That is, for the head A, in the conventional recording method, the audio data is recorded after the related video data, whereas in the recording method of the present embodiment, it is recorded before the video data.

FIG. 4 is a block diagram showing a schematic configuration of a recording-side signal processing circuit in the present embodiment. The audio signal input from the terminal 40 is subjected to processing such as data separation for double recording, separation of even / odd samples, and time axis compression in an audio preprocessing / distribution / pressure circuit 41, and is also distributed to four processing circuits. You. The circuit indicated by 1-E in the figure is a circuit for processing a signal starting with an even sample of the audio channel 1 in FIG. (The same applies to 4-E, 2-E, and 3-E.) Subsequently, the outer coding circuit 42 encodes the outer code, and the audio shuffling circuit 43 shuffles the data. Further, the delay circuits 44 respectively provide appropriate delay amounts D ₁ ′, D ₂ ,
Given D ₃ and D ₄ .

On the other hand, the video signal input from the terminal 45 is subjected to source coding and distribution to sectors 0 to 3 by a video pre-processing / sector distribution circuit 46, and then an outer code encoding circuit 47,
The video shuffling / compression circuit 48 receives outer code encoding, data shuffling, and time axis compression. Further, delay amounts D ₅ , D ₆ ,
D ₇ and D ₈ are given. Next, the switching circuit 50 associates the sector with the head.

The audio signal and the video signal thus separately processed are combined by the combining circuit 51. Thereafter, the inner code is encoded by the inner code encoding circuit 52, and the synchronization signal / identification signal is added by the synchronization signal / identification signal adding circuit 53. Further, the signal is modulated by a channel coding circuit 54 into a signal that matches the characteristics of the magnetic recording medium (magnetic tape), and then supplied from a terminal 55 to the head.

FIG. 5 is a processing timing chart at the time of recording by the circuit of FIG. ,... Are the same as the numbers in FIG. The delay amounts D ₁ ′, D ₂ ,... D ₈ in FIG.
The values are set so that the outputs of the heads A and B have a correct time relationship.

Here, the different recording side signal processing circuit of a conventional D-1 format digital VTR, the delay amount D ₁ of the total processing, distribution, compression circuit 41 and the delay circuit 44 in ', D ₁ of the of the D _4' is there. In this embodiment, since the recording method as shown in FIG. 2 is employed, the method of distribution to each head is naturally changed, and the heads A, B,
Signals starting with 1-E, 4-E, 2-E, and 3-E are distributed to C and D, respectively. Furthermore, since with respect to the head A 1 rotation time (approximately 6.7 m sec) earlier recorded compared with the conventional example, the delay amount D ₁ 'is D ₁ of the conventional example' when the delay amount for the D _1, D ₁ '= D ₁ -6.7 msec.

FIG. 6 is a block diagram showing a schematic configuration of a reproducing-side signal processing circuit in the present embodiment. Reproduction is performed in the reverse process of recording. That is, a reproduced signal from the head is input to the four terminals 60, the data clock is reproduced and demodulated by the clock reproduction / channel decoding circuit 61, and the block is synchronized by the periodic signal / identification signal decoding circuit 62. Address is identified. Further, the inner code decoding circuit 63
After the error detection / correction by the inner code is performed in, the signal is separated into audio and video by the separation circuit 64.

The audio signal is supplied to the delay circuit 65 with an appropriate delay amount D _TA
−D ₁ ′, _DTA −D ₂ , _DTA −D ₃ , and _DTA −D ₄ are given, and the audio deshuffle circuit 66 performs deshuffle (reverse conversion of shuffling). Next, an outer code decoding circuit 67 performs error detection and correction by the outer code, and a decompression / combination circuit 68 performs time axis decompression and synthesis of even / odd samples.
After the correction of the uncorrectable sample is performed, the signal is output from the terminal 70.

On the other hand, in the video signal, the head and the sector are associated by the switching circuit 71, and the delay amounts D _TV −D ₅ , D _TV −D ₆ , D _TV −D ₇ , D given a _TV -D _8. Next, the video deshuffle / expansion circuit 43 receives data deshuffle and time-base expansion, performs an error detection / correction by an outer code in an outer code decoding circuit 74, and performs sector synthesis in a sector synthesis circuit 75. After being corrected by the correction circuit 76, the signal is output from the terminal 77.

FIG. 7 is a processing timing chart at the time of reproduction by the circuit of FIG. The delay amount in FIG. 7 is a value that compensates for the difference in the delay amount at the time of recording D _TA −D ₁ ′, D _TA −D ₂ , D _TA −D ₃ , D
_{TA -D 4, D TV -D 5} , ..., are set to D _TV -D _8. (D _TA , D
_(TV is a fixed value.) Processing is performed through recording and reproduction so that the time relationship between audio and video does not shift.

Here, the difference from the conventional D-1 format digital VTR reproduction side signal processing circuit is that the delay amount D
And elongation-combining circuit 'D _TA -D ₁ of ~D _TA -D _{4' TA} -D ₁
68. Because it provides the delay amount so as to compensate for differences in delay at the time of recording in the delay circuit 65, D _TA regard head A
−D ₁ ′, = D _TA −D ₁ +6.7 msec, and the delay amount is larger than that of the conventional example. The decompression / combination circuit 68 performs composition corresponding to the change of the distribution method during recording.

Although the above-described circuit change is required, the total delay amount is the same when viewed through the recording / reproducing side, and it can be considered that the circuit scale does not change.

Processing such as time axis compression / delay is not necessarily shown in FIGS.
Various methods are possible without being limited to the method shown in FIG.

Next, another embodiment of the present invention will be described. At present, high-definition television systems, which have a wider frequency band than current standard television signals (NTSC or the like) and have much higher resolution, are attracting attention. At present, the standard of the system has not yet been determined, but it is expected that the system will be widely used for broadcasting and other purposes. As for digital VTRs for such high-definition television systems (high-definition digital VTRs), some prototypes have been reported to date, but no digital pitch data has been recorded on helical tracks. . So D
Consider a case in which the concept of a -1 format digital VTR is used to the utmost and the audio recording system of the present invention is applied.

One of the most promising high-definition television systems currently proposed is a frame frequency of 30 Hz, a field frequency of 60 Hz, a sampling frequency of a luminance signal of 74.25 MHz, a sampling frequency of two color difference signals of 37.125 MHz, and a number of lines of 1125 per frame. It is a book. In the following description, these values are assumed for convenience.

First, this high-definition television Shingo has a data rate five times or more that of the NTSC signal. Therefore, it is necessary to divide the signal into more channels than in the case of the D-1 format and record it. Here, the case of dividing into 16 channels is considered, but of course other numbers of channels are possible. Next, the audio signal is 48-channel sampling of 4 channels as in the case of the D-1 format, and a maximum of 20 bits / bit.
The signal of the sample is recorded by the double recording method.
That is, the ratio of the information amount between the audio signal and the video signal becomes smaller than that in the case of the D-1 format. And the minimum editing unit of the audio signal is 1/2 of the case of the D-1 format.
It is assumed that the drum with 16 heads rotates at 5 revolutions / frame as in the D-1 format, assuming 1/5 field (approximately 3.3 msec).

In this case, the minimum edit unit of audio data is allocated to recording areas on eight tracks. However, the data of one audio channel for 1/5 field is
If the even and odd samples are divided into different audio sectors, the audio sector becomes extremely small, which is not preferable in terms of redundancy. So, 1/5 of the field
The audio channel data is divided into one audio sector without dividing even-numbered samples, so that a total of eight 1 / 5-field audio sectors are provided. This is because four audio channels are stored twice, so that one audio sector exists per track. D
Even if an audio sector is provided in the center of a track as in the -1 format, if these audio sectors are provided in eight consecutive tracks, there is a possibility that these audio data may be simultaneously damaged due to scratches in the longitudinal direction of the tape. Very high.

FIG. 8 shows the arrangement of the video signal and the audio signal of 1/5 field on the tape in the embodiment in which the present invention is applied to the audio signal recording system of the high definition digital VTR. The video signal is processed in units of 1/5 field (1 segment) and divided into 16 video sectors 401 and recorded. The associated 8 audio sectors for 1/5 field are 402a,
402b, 402c, 402d, 402e, 402f, 402g, and 402h are formed. The numbers shown in the audio sectors are audio channel numbers, and one and the other of the data to be double-recorded are separated in the longitudinal direction of the tape. The embodiment shown in FIG.
= 8, M = 8, K = 4, and the third track group described above does not exist. It is desirable to separate even and odd samples as much as possible within each audio sector. The cue audio track 403, the control track 404, and the time code track 405 record an analog audio signal, a control signal, and a time code signal, respectively, as in the D-1 format.

In the embodiment of FIG. 8, even though the audio recording area on one track is extremely small, there is little possibility that the same audio data is simultaneously damaged due to a scratch in the longitudinal direction of the tape.

The present invention is not limited to the above two embodiments,
Various applications are possible. In the above two embodiments, K =
Although there was a relationship of M / 2, K can be arbitrarily selected in the range of 1 ≦ K ≦ M−1. Also, the audio recording area may be provided not at the center of the tape but at the end of the tape, for example.
The processing unit of the audio signal is also arbitrary. In addition, digital
The present invention is not limited to the VTR and can be applied to a digital audio recording system of an analog VTR that records a video signal as an analog signal.

[Effects of the Invention] According to the present invention, audio data for a predetermined period is prevented from being concentrated on a narrow area on the tape, and is effectively dispersed and recorded over a wide area. Recording of audio data in a rotating head video tape recorder without the complexity of the device, reducing the possibility that the related data will be simultaneously damaged and the quality of the reproduced audio will be degraded even in the case of a burst error due to dust or dust. A method can be provided.

[Brief description of the drawings]

FIG. 1 is a track pattern diagram on a tape in this embodiment, FIG. 2 is an enlarged view of an audio recording portion in the embodiment, FIG. 3 is a time chart showing the operation of each head in the embodiment, FIG. FIG. 5 is a schematic configuration diagram of a recording-side signal processing circuit in the embodiment, FIG. 5 is a time chart showing the operation of FIG. 4, FIG. 6 is a schematic configuration diagram of the reproduction-side signal processing circuit, and FIG. FIG. 6 is a time chart showing the operation of FIG. 6, FIG. 8 is a track pattern diagram on a tape in another embodiment of the present invention, FIG. 9 is a diagram of a tape format in a conventional digital VTR, and FIG. Track pattern diagram, Fig. 11 is an enlarged view of the audio recording part,
FIG. 12 is a diagram showing the code structure of the audio signal, FIG. 13 is a diagram showing the structure of one synchronous block, and FIG. 14 is a time chart showing the operation of each head. 501: Magnetic tape, 502: Recording track, 503a, 503b
…… Video sector, 504a-504d …… Audio sector, 505a-505e …… Edit gap, 101,605 ……
Recording part of audio data for a predetermined period.

Claims (1)

(57) [Claims] 1. A recording area for video data and a recording area for digitized audio data are respectively stored on one track.
In a method of recording audio data in a rotary head type video tape recorder that performs recording and reproduction by providing irregularities, a recording area of audio data belonging to a predetermined period is changed from a first side of adjacent (N + M) tracks. K books,
A total of N (M + 1) to (N−M) from the first side and (N + K + 1) to (M−K) from the first side (where M and K are 2 ≦ M ≦ N, 1 ≤ K ≤ M-1.) A method for recording audio data in a rotary head video tape recorder, wherein the audio data is recorded in a distributed manner on tracks.