JPH0218761A - Digital magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To record and regenerate the digital signal of high sound quality by recording the digital signal of a second format by being divided to a pair of recordable areas, at least, of a first format. CONSTITUTION:Out of the respective areas, for which 2n equal division (12 channels) of one track is executed, a pair of the recordable areas are detected at least. The digital signal of the second format, for example, the PCM data of 16 bits are divided and recorded to these detected areas. Accordingly, even when the areas, in which the PCM data of 8 bits are already recorded and remained, are respectively separated, those areas are coupled and the PCM data of the 16 bits can be recorded. Then, a multi-channel recording area can be effectively utilized. Thus, the digital signal of the high sound quality can be recorded and regenerated.

Description

[Detailed description of the invention] The invention will be explained in the following order.

A. Field of industrial application B. Overview of the invention C. Prior art D. Problem to be solved by the invention E. Means for solving the problem (Fig. 1) F. Effect G. Example G1 circuit configuration ('@Fig. 1) G2 Recording operation (Figures 2 to 5) G) Reproducing operation (Figures 6 to 9) H Effect of the invention A Industrial application field This invention is applicable to the so-called 8mm VT)2 PCM audio system. The present invention relates to a digital magnetic recording/reproducing device suitable for use in applications such as the above.

B. Summary of the Invention This invention detects at least one pair of recordable recording areas of a first format, and records a second format of digital No. 18 having a larger quantization bit than the first format in each of these areas. By dividing and recording digital signals, a multi-channel recording area can be used effectively, and high-quality digital signals can be recorded and reproduced.

C. Conventional Technology In the so-called 8mm V1'H, stereo or bilingual audio is recorded and reproduced using PCM signals using digital magnetic recording (Japanese Patent Application Laid-Open No. 18687-1987).
7, Japanese Patent Application Laid-Open No. 199409, etc.).

In conventional 8mm VTR PCM audio recording, the audio signal is approximately twice the horizontal frequency (3 times the horizontal frequency for NTSC).
It has been standardized to sample at 1.5 kHz), encode with 8 bits of broken lines (equivalent to 10 bits of straight lines), and record using the so-called bi-phase method using two frequencies.

In addition, in the PCM audio recording of the above-mentioned 8mm VTR, the first mode (b) is used as a normal V1''R for recording and reproducing the PCM audio signal together with the video signal.
Divide the recording portion of the video signal into 5 equal parts and record PCM audio for each range in parallel! It is considered to be used in 1FS2 mode. In other words, according to this second mode, as shown in Figure @10, the recorded portion of the video signal is
PCM audio recording (multi-channel recording) can be performed independently in a total of six areas (channels) of each equally divided area and the PCM audio recording area in the first mode. Audio signals can be recorded. Note that each channel includes two stereo or bilingual audio signals.

On the other hand, in the recording and reproduction of video signals for 8 mm VTRs, it is being considered to use a magnetic material with a higher coercive force in the recording medium to expand the transmission band and obtain higher quality video. In that case, in PCM audio recording as well, the transmission band should be expanded and the 8-10 conversion method used in the so-called l(-D A l)
For example, high-density recording can be realized in which the recording density of digital signals is twice that of the conventional technique.

Therefore, when recording a plurality of tracks '1' diagonally on the magnetic tape MT as shown in FIG.
As shown in FIG. 11B, it is conceivable to divide each of the audio signals into a plurality of parts and record them in the same manner as the multi-channel recording that is currently being performed, making it possible to record PCM audio in a maximum of 12 channels.

Incidentally, in FIG. 11B, the numbers on the left side are for the case where the l track is divided into 12 equal parts, forming a first format in which a predetermined amount of digital signals are recorded in parallel in each area, and the numbers on the right side are 1. A second format is formed in which a track is divided into six equal parts and a predetermined amount of digital signals are recorded in parallel in each m area. In this case, when all 12 channels are used, 8-bit information, for example, is recorded in each area, and when 11 channels or less are used, 16-bit or 12-bit information, for example, is recorded in each area.

In other words, 8-bit PCM data and 16-bit (or 1
It is possible to record a mixture of PCM data (2 bits).

Furthermore, each track in FIG. 11A consists of a large number of 1 synchronous blocks as shown in the upper part of FIG. 12, and the number of blocks is, for example, 132 for 8 mm VTR,
Then it is 144. Each synchronization block has an 8-bit synchronization pattern, for example, as shown in the lower part of FIG.
It consists of an ID code, block address, parity, and 256 bits of PCM data.

D. Problems to be Solved by the Invention By the way, in the case of the conventional recording system, PCM data has already been recorded in the 9th channel and the 11th channel, which are the 111 areas corresponding to 8 bits, as shown by diagonal lines in FIG. 11B. 916 bits (or 12 pints)
If you want to record PCM data, two 8-bit compatible channels (areas) are required, but as mentioned above, PCM data has already been recorded on the 9th channel and the 11th channel. Since the 10th channel and the 12th channel are separated, this part contains 16 bits (or 12 bits)) CM
The disadvantage is that data cannot be recorded.

This invention was made in view of this point, and it is possible to use 8-bit PCM data and 16-bit (or 12-bit) PCM data.
In a recording method that allows mixed data recording, two separate 8-bit PCM data recordable areas are combined to create a 16-bit (or 12-bit) PC.
The present invention provides a digital magnetic recording/reproducing device capable of recording M data.

E. Means for Solving the Problems The digital magnetic recording/reproducing apparatus according to the present invention parallelizes a predetermined amount of digital signals (e.g., 8-bit PCM data) for each area by making one track worth 2n$ (12 channels). 1 track is divided into n equal parts (6 channels) and a digital signal (for example, 16-bit PCM data) having larger quantization bits than the digital signal is recorded in parallel in each area. a second format, and is configured to detect a pair of recordable areas of the first format, and divide and record the digital signal of the second format in each of these areas. There is a “C”.

F Effect: Detects at least one pair of recordable or unrecorded areas in each area obtained by dividing one track into 2n equal parts (12 channels). Then, digital number 43 of the second format, that is, 16-bit PCM data is divided and recorded in these detected areas. As a result, even if 8-bit PCM data has already been recorded and the remaining areas are separated, these areas can be combined to record 16-bit PCM data, making the multi-channel recording area effective. It can be used for recording and reproducing high-quality digital signals.

G. Example Hereinafter, an example of the present invention will be described in detail based on FIGS. 1 to 9.

61 Circuit Configuration Figure 1 shows the circuit configuration of this embodiment. In the figure, the audio input signal supplied to the input terminal (11) is supplied to the format selector switch (2), and the audio input signal is supplied to the display/operation panel (2). terminals (41) to (44) according to the operation of terminals (not shown).
) Out of the control signals supplied to the switcher (2), in accordance with the control from the system control circuit (40) corresponding to the control signal at the terminal (44), analog noise is It is supplied to the reduction circuit (3). The signal whose noise component has been reduced and the dynamic range has been expanded in this circuit (3) is supplied to the AD/DA conversion circuit (4), and the converted digital signal (No. 5 is the lo-8 bit conversion circuit (5) The signal from this circuit (5) is supplied to an error correction interpolation circuit (6), which works with memories (7a) and (7b) to correct errors. Encoding for corrective interpolation is performed.

This encoded 8-bit PCM signal is supplied to a bi-phase three-type modulation/demodulation circuit (8), and this modulation signal is applied to a system control circuit (40) based on control signals applied to terminals (43) and (44), respectively. ), the video input signal from the terminal (12) and the video input signal from the terminal (
In the second mode in which the servo pilot signal from 13) is mixed and this PGM audio recording is performed in parallel for each area by dividing the recording portion of the video signal described above into five equal parts, Although not shown, a pilot signal for mode discrimination with a frequency of "1" is mixed by a vibrator from a pilot oscillator. This mixed signal is supplied to the head (16) through the recording amplifier (15) and recorded on the tape (17). In the second mode, the recording amplifier (15) is controlled by the system control circuit (40) which detects the multi-channel setting control signal from the terminal (42) to select the desired area on the tape (17). Recording is done only in

In addition, control from the system control circuit (40)
When using the first format of the -10 conversion method, the terminal (
[1] The acoustic input signal supplied to switch (2) is
The digital signal is supplied to the D/DA conversion circuit (21), and the converted digital signal is supplied to the error correction interpolation circuit (22), where it is encoded for error correction interpolation in cooperation with the memories (23a) and (23b). It will be done. This encoded 16-bit )) CM double signal terminal (
A switch (24) that is switched under the control of a system control circuit (40) based on a control signal from 41)
The modulation signal is supplied to the 8-10 conversion type modulation/demodulation circuit (25) via the switch (91, (10)) and the mixing circuit (11). Although not shown, a modulation method control pilot signal of frequency f2 is mixed with a vibrator from a viroft oscillator.This mixed signal is supplied to the head (16) through the amplifier (15) and recorded on the tape (17). Ru.

Furthermore, in the first format described above, since the encoding is in 16 linear bits, a signal encoded in 8 linear bits, for example, can be recorded at twice the density.

So, for example, the @ area divided into five equal parts and the original PCM
By further dividing the 6 channels of the audio recording area by 2'#- minutes, a maximum of 12 channels can be recorded in parallel. The format at this time! 82 format.

In that case, the audio human input signal supplied to the terminal (11) is transferred from the switch (2) to the analog noise reduction circuit (
30). The signal whose noise component has been reduced and whose dynamic range has been expanded by this circuit (30) is AD
/DA conversion circuit (31), the converted digital signal is supplied to error correction interpolation circuit (32),
Encoding for error correction interpolation is performed in cooperation with memories (33a) and (33b). This encoded 8-bit PCM signal is sent to the switch (2
4), and this signal is supplied to the head (16) through the modulation/demodulation circuit (25>, switch f9) (10), mixing circuit (11), and amplifier (15), and is recorded on the tape (17).

As a result, recording is performed in the first and second modes, the vibe format, and the first and second formats, and according to the above, when recording in the second mode, the pilot signal of frequency f1 is When recording in the first and second formats, the pilot signal of frequency f2 is superimposed on the digital signal and recording is performed.

Also, during playback, the signal played from the tape (17) by the head (16) is supplied to the switch (10) +9) through the playback amplifier (34) and playback equalizer circuit (35), and the system control circuit 1 & (40) For example, in the case of a bi-phase format, the signal is supplied from this switch (9) to the circuit (8) under control from the switch (9). In the second mode, the playback amplifier (34) is controlled by the system control circuit (40) based on the multi-channel setting control signal from the terminal (42), and only the desired area on the tape (17) is played back. be done.

Further, the signal demodulated by the circuit (8) is supplied to the circuit (6;, and decoding for error correction interpolation is performed in cooperation with the memory (7δ') (7b). This decoded signal is sent to the circuit (6; 5) and a bit-expanded signal of 8-10 bits is supplied to circuit (4).

The converted analog signal is then supplied to the circuit (3), and an audio output signal with reduced noise components and an expanded dynamic range is output to the format selector switch (36).
It is taken out to the output terminal (37) through.

Also, the control from the system control circuit (40)? il
B-10 conversion method! 182 formats t and 16
0 for bit encoding. The signal reproduced by the head (16) is supplied from the switch (9) to the circuit (25).

The signal demodulated by this circuit (25) is sent to the switch (24)
is supplied to the circuit (22) from the memory (23a).
(23b) decoding of error correction interpolation is performed. This decoded signal is supplied to the circuit (21), and the converted audio output signal is sent to the switch (36).
It is taken out to the output terminal (37) through.

Furthermore, when the control from the system control circuit (40) is in the first format and is 8-bit encoded, the circuit (40)
The signal demodulated by 25) is sent from the switch (24) to the circuit (
The decoded signal is supplied to the circuit (31), and the converted analog signal is supplied to the circuit (30). ), the audio output signal with reduced noise components and expanded dynamic range is sent to the output terminal (37) through the switch (36).
It is taken out.

Note that the servo pilot signal in the signal from the reproduction amplifier (34) is supplied to a servo circuit (not shown) to perform cab stan servo for tracking, etc., and the video output signal in the signal is reproduced. It is taken out to the output amplifier 1 of the forward amplifier (34). Note that this video output signal is not directly related to this invention, so it will not be described in detail, and (45)
is a detection circuit, which is used for detecting an RF signal when performing sequential reproduction during recording as will be described later.

Next, the detailed operation of FIG. 1 will be explained with reference to FIGS. 2 to 9.

G? Recording Operation First, the recording operation will be explained with reference to FIGS. 2 to 5. The operation starts at step (50) in Fig. 2, and the recording mode is changed to multichannel recording mode (step (51)).
2nd mode). In step (52), for example, 6-channel, 8-bit PCM data is recorded using the current PCM recording method, i.e., the pi-phase method in which one track is divided into six equal parts and a predetermined amount of digital signals are recorded in parallel in each area. The system control circuit (40) determines whether or not it is a record, and if so, step (53)
) Is there a change from the analog noise rig 2932 circuit (3) in Figure 1? Recording is performed through a circuit system leading to the jj tone circuit (8) and the like.

If not in step (52), in step (54) a new high-quality PCM recording method is used, that is, 8-10 conversion in which the l track is divided into six equal parts and a predetermined amount of digital signal is recorded in parallel on each recording. For example, 6-channel, 16-bit PCM data (second format)
The system control circuit (40
), and if not, in step (55), the new PCM recording method with normal sound quality, that is, 1 track is converted to 12
For example, 12 channels based on the 8-10 conversion method in which a predetermined amount of digital signals are divided into equal parts and recorded in parallel for each area.

The recording mode is set to 8-bit PCM data (first format), and recording is performed through the circuit system from the analog noise reduction circuit (30) to the modulation/demodulation circuit (25) and the like shown in FIG.

If step (54) is a new PCM recording method with high sound quality, step (56) will sequentially play back, for example, 12 channels of the multi-channel recording area, detect areas where recording 1, lJ is possible, Combine.

This will be explained in more detail with reference to FIGS. 3 and 4. In addition, in FIG. 3 and FIG. 4, a represents the number of the multi-channel recording area, for example, 1≦a≦1.
It is 2.

In step (561), the head (16) reproduces the corresponding area and the R obtained at the output side of the reproduction amplifier (34).
The signal is detected by the F-fold signal detection circuit (45) and supplied to the system control circuit (40) to determine whether or not the first channel among the 12 channels in the multi-channel recording @ area can be recorded. That is, if the RF double signal does not exist, it is determined in step (562) whether or not the $2 channel is recordable, and if it is recordable, step (562) is performed.
563), the first channel and the second channel are combined.

Now, at least one pair of areas in which 16-bit PCM data can be recorded has been detected, so step <57) (
Recording is performed through the high-quality recording mode (FIG. 2), that is, the circuit system from the conversion circuit (21) to the modulation/demodulation circuit (25) shown in FIG. Note that the ID signal indicating which channel is combined for each track is sent to the 12th
Enter it in the ID code of the data format shown in the figure.

In step (562), if the second channel is not recording pJi, in step (564>) it is determined whether or not the third channel is recordable, and if it is recordable, step (56s)
The first channel and the second channel are combined in step (57), and high-quality sound recording is performed in step (57).

The same applies to steps (56c) to (5623).
If the -ta 4 area is detected, high-quality sound recording is performed in step (57), and step (5) is performed.
If the 12th channel is not recordable in step 622), it can be determined that the only recordable channel is the 1st channel in step 5624, so the warning lamp 2 (not shown) is used to record high quality sound in step 5628. indicates that it cannot be done without erasing other areas.

If the W4i channel is not recordable in step (56t), it is determined in step (562G) whether or not the second channel is recordable; 2. If it is recordable, it is determined whether or not it is recordable for each channel as in the case of the first channel, a pair of recordable areas is detected, and step (5) is performed.
7) Perform high quality recording.

If the second channel is not recordable in step (562G), the same determination as above is made for the third to 12th channels, and finally in step (562T), all the first to 12th channels are not recordable. When this is found, the warning lamp 1 (not shown) is turned on in step (56211).
is used to indicate that there is no unrecorded area, that is, all one track has been recorded, and in step (562 ma) the first
If it is found that only two channels can be recorded, the above-mentioned warning lamp 2 is turned on in step (5625).

FIG. 5 shows the timing of recording when the pair of recordable areas is the 10th channel and the 12th channel. FIG. , and its low level period corresponds to the other of (16). Then, 'ζ corresponds to the periods obtained by dividing the high level or low level period of this switching pulse into approximately 12 equal parts.
The recording area control signal from the system control circuit (40) for energizing the recording amplifier (15) in FIG. 1 only for that period to record each of the 12th channels is set as shown in FIGS. There is. Each of the fifth and E pulses is transmitted to the system control circuit (40) when recording the 1st O channel and 12th channel of one track.
This is a recording area control signal given to the recording amplifier (15).

5B and 5C represent the writing timing of the memories (23a) and (23b) in FIG. 1, respectively, and FIG.
During the high level period of the write signal, the conversion circuit (21)
The digital signal from the conversion circuit (21) is written to the memory (23a) 4, and during the high level period of the write signal shown in FIG.
b) Then, during the low level period of the switching pulse shown in FIG. 5A, a recording area control signal as shown in FIG. 16
Bit PCM data is recorded by one of the heads (16) in the areas of the 1st O and 12th channels of one track of the tape (17). Furthermore, during the high level period of the switching pulse shown in FIG. 5A, a recording area control signal as shown in FIG.
), and the 16-bit PCM data read out from the memory (23b) is recorded in the 10th and 12th areas of one track of the tape (17) by the other side of the buffer (16).

G3 Playback Operation Next, the playback operation will be explained with reference to FIGS. 6 to 9.The operation starts at step (60) in FIG.
61), the system control circuit (40) detects the biloft signal of frequency f1 and determines whether or not it is multi-channel recording, that is, whether it is the second mode. If so, step (6
2) from the * demodulation circuit (25) in Figure 1 to the conversion circuit (21).
), and so on through the circuit system.

If it is multi-channel recording in step (61), the system control circuit (40) detects a biloft signal of frequency f2 in step (63) and determines whether or not the recording is based on the current PCM recording method, that is, the pi-phase method.
If so, in step (64) reproduction is performed through the circuit system from the modulation/demodulation circuit (8) to the analog noise reduction circuit (3) and the like.

If the current PCM recording method is not used in step (64),
In other words, if recording is performed using the 8-1O conversion method, step (
65), a new high-quality PCM recording method, or the second
Based on the format of (6 channels, 16 bits), the system control circuit (4θ) determines whether or not the recording is of PCM data. If not, step (6
6) New PCM data with normal sound quality, i.e. 8-10
*The 12-channel, 8-bit PCM data based on the first format is transferred from the modulation/demodulation circuit (25) in Figure 1 to the analog noise reduction circuit (30).
Reproduction is performed through a circuit system that leads to etc.

If step (65) is a new PCM recording method with high sound quality, step (67) is to select which channel of the multi-channel recording VA area has a 16-bit PC.
ID indicating that the M date is recorded separately.
Detects whether there is a signal, and combines at least one pair of channels (areas) with the ID signal to create a complete one.
It is a 6-bit high quality signal.

This will be explained in more detail with reference to FIGS. 7 and 8. In addition, in FIG. 7 and FIG. 8, a represents the number of the multi-channel recording area, for example, 1≦a≦1.
It is 2.

In step (671), the signal reproduced by the head (16) is modulated by the modulation/demodulation circuit (25), and its ID code is checked by the system control circuit (40). It is determined whether or not there are 10 signals indicating that 16-bit PCM data is divided and recorded in the first channel, and if the IDi number is present, a similar ID is assigned to the second channel in step (672). It is determined whether or not there is a signal, and if there is a 1D signal, the first channel and the second channel are combined in step (6'h), so that the pair of 16-focus PCM data divided during recording is transferred to the first channel. and the second channel, so proceed to step (62) (Fig. 6) and install the high-quality sound reproduction mode, that is, the circuit from the modulation/demodulation circuit (25) in Fig. 1 to the conversion circuit (21), etc. High quality sound is played back through the system.

If the second channel does not have xo confidence in step 7' (672), it is determined in step (674) whether there is a similar ID signal in the third channel, and if there is an ID signal, the 1 channel and @3 channel are combined and high quality sound reproduction is performed in step (62).

Similar determination is made for steps (67g) to (6723), and if a pair of areas is detected, step (62
) to perform high-quality sound playback, and step (6722)
If there is no ID signal on the 12th channel, step (
6724), the warning lamp 4 (not shown) is used to indicate that only half of the 16-bit PCM data has been recorded and cannot be reproduced.

If there is no ID signal in the first channel in step (671), it is determined in step (6725) whether or not there is an ID signal in the second channel, and if so, an ID is attached to each channel as in the case of the first channel. Determine the presence or absence of a signal,
A pair of 16-bit PCM data divided at recording intervals is detected, and high-quality sound reproduction is performed by snapping (62).

Step <6725> adds 1D (2
If there is no signal, the same determination as above is made for the 3rd to 12th channels, and finally, in step (672, C), it is determined that there is no IL) signal for all of the 1st to 12th channels. If this is found, use warning lamp 3 (not shown) in step (672t) to indicate that no 16-bit high quality sound signal has been recorded, and proceed to step (672t).
7z@), when it is found that there is an ID signal only on the 12th channel, the above-mentioned warning lamp 4 is turned on in step (6724).

9th FI! J indicates the playback timing when ID (number i) exists in the 10th channel and the 12th channel, which indicates that 16-bit PCM data is recorded separately. represents an RF switching pulse, whose high level period corresponds to one of the heads (16), and whose low level period corresponds to the other head (16). The system control circuit (40) activates the reproduction amplifier (34) shown in FIG. 1 for the period corresponding to approximately 12'4 of the level period to reproduce the first to twelfth channels, respectively. The reproduction area control signal is set as shown in FIGS. 9B and 9C.

The pulses shown in FIGS. 9B and 9C are reproduction area control signals given to the reproduction amplifier (34) by the system control circuit (40) when reproducing the 1st θ channel and the FF112 channel of the l track.

9th diagram and E represent the read timing of the memories (23a) and (23b) in FIG. 1, respectively, and during the high level period of the read signal in the 9th diagram, the memory (23a
) is continued and supplied to the conversion circuit (21),
During the high level period of the read signal in Fig. 9E, the memory
The contents of (23b) are read out and supplied to the conversion circuit (21). During the low level period of the switching pulse shown in FIG. 9A, a reproduction area control signal as shown in FIG. 9B is supplied to the reproduction amplifier (34) as a gate signal.
ζ, 16-bit PCM data reproduced by one head (16) from the 10th and 12th channel areas of one track of the tape (17) is supplied to the memory (23a) through the reproduction amplifier (34) and stored therein. be done. Also, during the 71st level period of the switching pulse shown in Figure A of gIA9, a reproduction area control signal as shown in Figure 9C is supplied to the reproduction amplifier (34) as a gate signal to The 16-bint PCM data reproduced by the other head (16) from the area of the 12th channel is supplied to the memory (23b) through the reproduction amplifier (34) etc. and stored therein.

In this way, in this embodiment, for example, 6 channels with large quantization bits and 16-bit PCM data are recorded in at least one pair of remaining recordable channels among each of the 12 divided channels in which 8-bit PCM data is recorded.
Since the commercial data is recorded separately, the multi-channel recording area can be used effectively and high-quality P.
CM data can be recorded and played back.

Although the above embodiment has been explained using 8 mm VTR PCM data as an example, the present invention can also be applied to other digital signals such as boat fishing. Further, in the above embodiment, there are two combinations of recordable areas, but more combinations may be possible. Furthermore, although the stitching bits are 8 pints and 16 bits, the present invention is not limited thereto, and other quantization bits may be used.

Effects of the Invention As described above, according to the present invention, the digital number 14 of the second format is divided and recorded in at least one pair of recordable areas of the first format. The area can be used effectively and high-quality digital signals can be recorded and reproduced.

[Brief explanation of the drawing]

FIG. 1 is a circuit configuration diagram showing an embodiment of the present invention, FIGS. 2 to 4 are flowcharts for explaining the recording operation in FIG. 1, FIG. 5 is a timing chart thereof, and FIGS. FIG. 8 is a flowchart for explaining the reciprocating operation of FIG. 1, and FIG. 9 is a timing chart thereof,
Figures 1 to 12 are diagrams for explaining a conventional example. (11 is the audio input terminal, (2), (91, (36) are the format switching switches, +6), (22),
(32) is an error correction interpolation circuit, (8) is a bi-phase type modulation/demodulation circuit, (16) is a helad, (17) is a tape, (25) is an 8-IO conversion type modulation/demodulation circuit, (
40) is a system control circuit.

Claims (1)

[Claims] A first format in which one track is divided into 2n equal parts and a predetermined amount of digital signals is recorded in parallel in each area; a second format for recording in parallel a digital signal having a quantization bit larger than that of the digital signal; detecting at least one pair of recordable areas of the first format; A digital magnetic recording/reproducing device characterized in that a format digital signal is divided and recorded.