JPH06338132A - Digital signal recording device and record reproducer - Google Patents

Abstract

PURPOSE:To enable dubbing at a high speed, and to shorten the dubbing time by installing the changeover circuit of compressed data on the recording side and expanded data on the reproduction side and transmitting reproduction side data to the recording side without expansion at the time of dubbing at a high speed. CONSTITUTION:A mean read-out rate is increased by a medium access requirement signal 57 from a first micro-computer 7 and continuous read is conducted at the time of a dubbing mode at a high speed in a mode changeover signal 22 from a mode setting terminal 21. The transfer rate of the input 5 of a first buffer RAM 6 and the transfer rate of an output 9 are equalized by a RAM control signal 8. A signal 9 before expansion output from the RAM 6 is selected as an output signal 24 in a changeover circuit 23, and a mean write rate to a recording-side recording medium 28 is also increased by the signal 57 and continuous wite is performed. Consequently, the signal is reproduced at a high speed from a reproduction-side recording medium 1, and the regenerative signal is recorded on the medium 28 at a high speed. Accordingly, compressed data can be dubbed without expansion, thus accelerating the dubbing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for dubbing in a digital signal recording / reproducing system for compressing / decompressing data, and more particularly to dubbing in a double deck such as MD or DCC.

[0002]

2. Description of the Related Art A conventional dubbing method in a disk recording / reproducing apparatus for performing data compression / expansion as shown in Japanese Patent Laid-Open No. 4-61069 discloses a method in which data from a recording medium is expanded from a reproducing side to a recording side. It was to send, re-compress the data on the recording side, and record it on the recording medium.

[0003]

In the conventional dubbing,
For example, even in a system that compresses data to 1/5, the time required for dubbing could not be reduced to 1/5 because the decompressed data was sent to the recording side.

[0004]

According to the present invention, as an input system on the recording side, an output of a recording side compression circuit and undecompressed data after error correction by a correction code attached in advance on a reproducing side are provided. Is provided with a selection circuit for switching
To the data that cannot be corrected by the error correction process, a code that makes the data uncorrectable when the error correction process is performed is added on the recording side.

[0005]

In the high-speed dubbing, the data before the expansion after the error correction is performed from the reproducing side is sent to the recording side together with the error correction result information without passing through the expansion circuit for the dubbing.
Data transfer from the reproducing side to the recording side is performed faster than usual. Also, since correction code that cannot be corrected is attached to data that cannot be corrected on the playback side,
Even when the dubbing made is reproduced, it becomes uncorrectable again and no inconvenience occurs.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the present invention in which a reproducing side recording medium 1, a pickup 2 for reproducing a signal from the recording medium 1, a demodulating circuit 4 for demodulating a reproduced signal by the pickup 2 and a demodulating circuit. A correction processing circuit 54 that performs error correction processing on the output of No. 4 and a signal 44 indicating the position on the medium reproduced by the demodulation circuit 4 indicating the position on the medium and a reproduction side tracking state signal 56 are input, and a pickup is performed. Two
The first servo circuit 45 for outputting the pickup position control signal 46 so as to adjust the position to the appropriate position, the first buffer RAM 6 for storing the corrected data 5 output from the correction processing circuit 54, and the RAM 6 A first microcomputer 7 for outputting a signal for controlling the decompression, a decompression circuit 10 for receiving a pre-decompression signal 9 output from the RAM 6 and performing decompression processing,
An audio data output terminal 12 for receiving the output of the decompression circuit 10, an audio data signal input terminal 13 for inputting recording audio data, a compression circuit 15 for compressing the audio data 14, and a compressed signal 16 are stored. Depending on the second buffer RAM 17, the second microcomputer 18 that outputs a signal for controlling the RAM 17, the mode setting terminal 21 to which the mode switching signal 22 is input, and the mode switching signal 22, the pre-decompression signal 9 on the reproducing side, RAM
A switching circuit 23 for selecting whether the output signal is from the output signal 17, a correction code adding circuit 30 for adding a correction code to the output signal from the switching circuit 23, a modulation circuit 25 for modulating the output of the correction code adding circuit 30, and a recording side. The recording medium 28, the writer 27 for recording the output from the modulation circuit 25 on the recording medium 28, and the recording side tracking state signal 58 are input, and the writer position control signal 48 is output to output the writer 27.
And a second servo circuit 47 for adjusting the recording position according to.

The operation will be described in order. In the embodiment shown in FIG. 1, two modes, a normal mode and a high-speed dubbing mode, are provided, and the two modes are switched by the mode switching signal 22 input from the mode setting terminal 21.

First, the operation when the mode switching signal 22 indicates the normal mode will be described. On the reproducing side, the reproducing signal 3 is intermittently read from the recording medium 1 by the pickup 2. At this time, the first servo circuit 45 refers to the reproduction side tracking signal 56 sent from the pickup 2 so that the signal on the recording medium 1 can be reproduced, and the position on the medium output from the demodulation circuit 4 can be determined. A pickup position control signal 46 is output so as to adjust the position of the pickup to a predetermined position with reference to the signal 44 shown. The reproduced signal 3 is demodulated by the demodulation circuit 4 and further corrected by the correction processing circuit 54.
At the time of recording, error correction processing is performed by an error correction code that is added in advance at the time of recording, and the first buffer RA is used as the corrected data 5.
Sent to M6. Then, the first microcomputer 7 controls the control signal 8 so as not to cause a shortage of read data from the RAM 6 to be expanded and a shortage of the writable area of the RAM 6 due to the intermittent reading from the reproducing side recording medium 1. To control the writing and reading of the RAM 6, and to output the medium access request signal 57 to output the medium 1
The read amount is controlled to adjust the amount of data in the first buffer RAM 6. The decompression circuit 10 performs decompression processing on the pre-decompression signal 9 output from the first buffer RAM 6, and sends the decompressed audio output data 11 to the output terminal 12. Therefore, the transfer rate of the input signal 5 and the transfer rate of the output signal 9 of the first buffer RAM 6 are different.

Next, on the recording side, the audio input data 14 input from the audio data input terminal 13 is compressed by the compression circuit 15, and the compressed data 16 is the second buffer R.
It is sent to AM17. The second microcomputer 18 outputs the control signal 19 so as to prevent shortage of the writable area of the RAM 17 and shortage of the read data from the RAM 17 due to the intermittent writing operation to the recording side recording medium 28, and the inside of the buffer RAM 17 is output. Adjust the amount of data in. RAM17
The output signal 20 from and the pre-decompression signal 9 on the reproducing side are input to the switching circuit 23. When the mode switching signal 22 input from the mode setting terminal 21 indicates the normal mode, the output signal 20 is selected as the output 24. Correction processing circuit 30
Adds an error correction code to the output 24, and the modulation system circuit 25
Modulates the output of the correction processing circuit 30 and outputs the medium recording output 26. The writer 27 intermittently records the output 26 on the recording-side recording medium 28. Then, at this time, the second servo circuit 47 refers to the recording side tracking signal 58 and outputs and controls the writer position control signal 48 so that the recording position by the writer 27 is adjusted to a predetermined position.

The operation in the normal mode has been described above, and the operation in the high-speed dubbing mode will be described below.

When the mode switching signal 22 input from the mode setting terminal 21 indicates the high speed dubbing mode,
First, by the medium access request signal 57 from the first microcomputer, the average reading rate from the reproducing side recording medium 1 is increased to change from intermittent reading to continuous reading. Then, in response to the continuous reading, the transfer rate of the input 5 and the transfer rate of the output 9 of the first buffer RAM 6 are made equal by the RAM control signal 8. The switching circuit 23
Then, the pre-expansion signal 9 output from the first buffer RAM 6 is selected as the output signal 24. Further, the medium access request signal 57
As a result, the average write rate to the recording medium 28 is also increased, and intermittent writing is changed to continuous writing.
As a result, the signal is reproduced from the reproducing side recording medium 1 at high speed, and the reproduced signal is recorded on the recording side recording medium 28 at high speed as in the reproducing side. The average reading rate is the signal reading rate including the time during which the reading operation is not performed in the intermittent reading, and the same applies to the average writing rate.

In this way, in the high speed dubbing mode, the compressed data can be dubbed without decompressing, and the dubbing speed can be increased.

This will be explained by taking a system related to a mini disk (MD) as an example. First, in CD-MO, M [b
The data sampled at [ps] and input is subjected to signal processing and then recorded on the disc at a transmission rate L [bps]. On the other hand, in MD, the input sampled at M [bps] is compressed to have a rate of N [bps],
Normally, the average transmission rate L × (N / M) [bp
s]. (M, N, L are real numbers satisfying M> N, L> N) And since the recording operation is performed intermittently in order to perform the processing without changing the CD-MO transmission system processing, the average transmission referred to here. The rate is a transmission rate including the time during which no recording operation is performed.

In the present invention, the average transmission rate on the reproducing side and the recording side is increased to K [bps], and the modulation circuit, the demodulation circuit, the correction code adding circuit, and the correction processing circuit are operated in accordance therewith to compress the compressed data. High speed transfer. (K is L ×
(A real number that satisfies (N / M) <K ≦ L) At this time,
The modulation circuit, the demodulation circuit, the correction code addition circuit, and the correction processing circuit do not need to be changed because only intermittent operations are required as in the recording operation. As a result, the dubbing time in the ⅕ data compression system can be shortened to ⅕ of the normal time.

Further, as shown in FIG. 7, high-speed dubbing is possible even if the signal input from the reproducing side is changed. FIG. 7 shows FIG.
In this example, the input of the switching circuit 23 is changed from the pre-decompression signal 9 to the post-correction signal 5, and the constituent elements are the same as in the example of FIG.

In the embodiment shown in FIG. 1, even if the data cannot be corrected on the reproducing side, the correction code is re-attached on the recording side. ) Was originally correct or could be corrected correctly by the correction process (OK).
Inconvenience treated as data) may occur. In order to eliminate this inconvenience, FIG. 2 shows an embodiment in which a process for making uncorrectable data uncorrectable at the next reproduction is added.

In the example of FIG. 2, the correction code adding circuit 30 in the example of FIG. 1 inputs the flag signal 29 indicating the data reliability from the first buffer RAM 6, and normally outputs the flag signal 29 from the switching circuit 23 to the output signal 24. No. 1 correction code is added, or the flag signal 29 indicates that the data whose reliability is low is added with a code that cannot be corrected when error correction processing is performed. .

The operation is the same as in the example of FIG. 1 up to the point where the output 24 of the switching circuit 23 is obtained. The correction code adding circuit 30 which receives the output 24 of the mode signal 22
Indicates a normal mode, a normal error correction code is added, and a high-speed dubbing mode indicates that the flag signal 29 output from the first buffer RAM 6 on the reproducing side indicates that the data is shown to have low reliability. Adds a code that cannot be corrected when error correction processing is performed. The output of the correction code addition circuit 30 is sent to the modulation circuit 4, and the subsequent operation is the same as that in FIG.

In this way, by changing the correction code added at the time of dubbing recording, it is possible to perform recording so that NG data is not mistakenly treated as OK data at the time of the next reproduction, so that no inconvenience occurs.

FIG. 4 shows an example of a processing method for forcibly adding a code that cannot be corrected when the above error correction processing is performed. FIG. 4 is a flow chart of code addition processing for error correction processing in which up to two pieces of error data can be corrected and correction becomes impossible when the number of pieces of error data becomes three or more. 33, holding group data 35, and correction code addition group data 34
A correction processing parity code 36 generated by the group data 34, and the correction code-added group data 37.
It is indicated by.

The processing will be described in order. When the data D (n) 39 in the group data 33 before correction code addition is the NG data which cannot be corrected and is sent, first, the data D (n) 39 and the data D (n-1) 38 and data D (n
+1) 40 are saved as the holding group data 35. Then, instead of the data 38, the substitution data E ₁ 41 which is not equal to the data 38, the substitution data E ₂ 42 which is not equal to the data 39 instead of the data 39, and the substitution data E ₃ 43 which is not equal to the data 40 instead of the data 40 are adopted. Then, the correction code addition group data 34 is configured. A correction processing parity 36 is generated from the group data 34. After that, the data D (n-1) 38 saved in the holding group data 35 is replaced with the data D (n) 39 at the place of the substitute data E ₁ 41.
In place of data E ₂ 42, and data D (n +
1) Return 40 to the place of substitute data E ₃ 43. Then, together with the generated parity code 36, group data 37 after correction code addition is configured.

When error correction processing is performed using the parity code thus obtained, data D (n-1) 38
The data D (n) 39 and the data D (n + 1) 40 are determined to be erroneous. Then, for example, in the case of the double-coded Reed-Solomon code, this processing is performed for both the inner code and the outer code.

In the example of FIG. 1, since the recording side and the reproducing side operate with different control clock systems, the output 9 of the first buffer RAM 6
Asynchronism may occur between the output of the second buffer RAM 17 and the output 20 of the second buffer RAM 17. As a measure against this, the example of FIG. 3 is a process in which the pre-decompression signal 9 from the reproducing side is adjusted to the control clock system timing on the recording side.

The example of FIG. 3 further includes a strobe circuit 31 between the first buffer RAM 6 and the switching circuit 23, which converts the pre-decompression signal 9 into an output that matches the control clock system timing on the recording side. It is provided.

The operation is the same as in the example of FIG. 1 up to the point where the output 20 of the second buffer RAM 17 is obtained. The output 20 is input to the switching circuit 23, and the pre-decompression signal 9 on the reproducing side is input to the switching circuit 23 as the output 32 after being matched with the control clock system timing on the recording side by the strobe circuit 31. In the switching circuit 23, the mode switching signal 2 input from the mode setting terminal 21 is input.
Output 20 is selected as the switching circuit output 24 when 2 indicates the normal mode, and output 32 when the high speed dubbing mode is indicated. The correction code adding circuit 30 outputs 24
Is input, and the subsequent operation is the same as the example of FIG.

In this way, the timing of the signals sent to the modulation system circuit 25 can be made common, so that no inconvenience due to the asynchronism of the signals sent from the reproducing side occurs.

FIG. 5 shows an example in which data is directly transferred from the recording medium on the reproducing side to the recording medium on the recording side, and the circuit is the same as the example in FIG. 1, but the signal flow is different.

Since the operation in the normal mode is the same as the example of FIG. 1, only the operation in the high speed dubbing mode will be described. Mode switching signal 22 input from the mode setting terminal 21
Indicates a high-speed dubbing mode, the first servo circuit 45 first increases the average reading rate. Then, the first microcomputer 7 uses the control signal 8 to correct the corrected data 5 and the first data.
The transfer rate is controlled to be the same as that of the pre-expansion signal 9 output from the buffer RAM 6. The switching circuit 23 selects the reproduction signal 3 as the output signal 24. Further, the second servo circuit 47 refers to the on-medium position signal 44 on the reproducing side, and reproduces the reproduced signal 3 sent from the reproducing side on the same recording side recording medium 28 as the position recorded on the reproducing side recording medium 1. The writer position control signal 48 is output so as to be recorded at the position of, and the average writing rate is also increased.

In this embodiment, the data can be directly transferred, and the recording side can be appropriately operated according to the re-access or the like performed due to the access failure on the reproducing side. Further, by re-recording the reproduced data without performing error correction, the reliability of the data decreases each time the dubbing is repeated, so that it is possible to prevent infringement of copyright due to high-speed dubbing.

FIG. 6 shows an example of a high-speed dubbing-compatible recording apparatus configured to perform the dubbing shown in FIG.
The audio data signal input terminal 13 to which the recording audio data 14 is input, the compression circuit 15 for compressing the audio data 14, the second buffer RAM 17 for storing the compressed signal 16 and the access to the RAM 17 are controlled. A second microcomputer 18 that outputs a signal 19,
Depending on the shortcut signal input terminal 49 to which the external compressed data 50 is input, the mode setting terminal 21 to which the mode switching signal 22 is input, and the mode switching signal 22, the external compressed data 50 or the output signal 20 from the RAM 17 A switching circuit 23 for selecting, a flag signal input terminal 51 for inputting a flag signal 52 indicating the reliability of the external compressed data, and an output signal 24 from the switching circuit 23 are provided with a normal correction code or externally. A correction code adding circuit 30 that can switch whether to add a code that cannot be corrected when error correction processing is performed to data that has low reliability by the flag signal 52, and a modulation circuit 25 that performs modulation processing. A recording side medium 28, and a writer 27 for recording the output signal 26 from the modulation circuit 25 on the recording medium 28, It is composed of a servo circuit 47 for outputting a positioning signal 48 out 27.

First, the operation in the normal mode will be described. The audio input data 14 input from the audio data input terminal 13 is compressed by the compression circuit 15, and the compressed data 16 is sent to the second buffer RAM 17. The second microcomputer 18 runs out of the writable area of the RAM 17 due to intermittent writing operation to the recording medium 28,
The control signal 19 is output and the amount of data in the buffer RAM 17 is adjusted so that the read data from the buffer 17 does not run short. The output signal 20 from the RAM 17 and the compressed data 50 are input to the switching circuit 23, and the mode setting terminal 21
When the mode switching signal 22 input from indicates the normal mode, the output signal 20 is sent as the output 24 to the correction code adding circuit 30. The correction code addition circuit 30 adds an error correction code. The modulation circuit 25 modulates the output of the correction code addition circuit 30. The writer 27 intermittently records the output 26 of the modulation circuit 25 on the recording medium 28. Then, the servo circuit 47 refers to the recording side tracking signal 58 and outputs a position alignment signal 48 so as to align the recording position of the writing mark 27 with a predetermined position. Next, the operation in the high speed dubbing mode will be described. When the mode switching signal 22 indicates the high speed dubbing mode, the compressed data 50 is selected as the output 24 of the switching circuit 23. Further, the correction code adding circuit 30 adds a code which becomes uncorrectable to the compressed data 50 having a low reliability according to the flag signal 52 when the error correction processing is performed. Further, the servo circuit 47 changes the alignment signal 48 to increase the average write rate to the recording medium 28 and continuously record to the recording medium 28 instead of intermittently. Therefore, the compressed data 50 from the outside is recorded faster than usual.

In this way, in the high-speed dubbing mode, since the compressed data sent from the outside can be dubbed as it is, a large amount of data can be transferred in a short time, so that the dubbing can be speeded up. .

[0033]

Since the data handled in dubbing is compressed data, high-speed dubbing is possible and dubbing can be completed in a short time.

Further, by changing the correction code added at the time of dubbing recording, it is possible to perform recording such that NG data is not mistakenly treated as OK data at the time of the next reproduction, so that no inconvenience occurs.

Further, in the example in which data is transferred directly from disk to disk, re-recording is performed without performing error correction on reproduced data, so that the reliability of the data decreases each time dubbing is repeated, so high-speed dubbing is performed. It is possible to prevent infringement of copyright by.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a digital recording / reproducing apparatus to which the present invention is applied.

FIG. 2 is a diagram showing an embodiment of a digital recording / reproducing apparatus to which the present invention is applied and the correction code addition is adaptively processed.

FIG. 3 is a diagram showing an embodiment of a digital recording / reproducing apparatus to which the present invention is applied and a strobe circuit is further added.

FIG. 4 is a detailed diagram of a process of forced addition of an uncorrectable code in the present invention.

FIG. 5 is a diagram showing an embodiment of the present invention in which dubbing is performed directly from medium to medium.

FIG. 6 is a diagram showing an embodiment of a digital recording device to which the present invention is applied.

FIG. 7 is a diagram showing another embodiment of a digital recording / reproducing apparatus to which the present invention is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Reproducing side recording medium, 3 ... Demodulation system circuit, 5 ... 1st buffer RAM, 6 ... 1st microcomputer, 9 ... Expansion circuit, 14 ... Compression circuit, 16 ... 2nd buffer RAM, 17 ... 2nd microcomputer, 22 ... switching circuit, 24 ... modulation system circuit, 26 ... recording side recording medium, 45 ... first servo circuit, 47 ... second servo circuit.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshifumi Takeuchi 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Ltd.

Claims (12)

[Claims] 1. A data group obtained by inputting digital data, forming a predetermined number of the digital data as a data group, and compressing the data group within a time shorter than the time required for inputting the data group. A digital data recording device for generating a signal for recording on a medium and recording it on a recording medium, a compression processing means for compressing input data, and a correction code addition for adding an error correction code to the compressed data. And a modulation processing means, and a digital data recording apparatus for recording the output of the modulation system processing means on the first recording medium, the first mode and the second mode being selected. A mode input means for inputting a switching signal, an external data input means for inputting external compressed data, and the compression means when the first mode is selected. Switching means for outputting the external compressed data to the modulation processing means when the second mode is selected is provided between the compression processing means and the modulation processing means. Digital signal recorder. 2. A data group obtained by inputting digital data, forming a predetermined number of the digital data as a data group, and compressing the data group within a time shorter than the time required for inputting the data group. A digital data recording device for generating a signal for recording on a medium and recording the signal on a recording medium, comprising: a first recording medium, a second recording medium, and a second recording medium on which compressed data is recorded. Digital including a demodulation system processing means comprising a demodulation means for demodulating a reproduction signal and a correction processing means for performing an error correction processing by a correction code added to the data, and a decompression processing means for decompressing the output of the demodulation system processing means. A data reproducing device, a compression processing means for compressing digital input data, and a correction code for adding an error correction code to the output of the compression processing means. A digital data recording / reproducing apparatus including two devices, a modulation system processing unit including an adding unit and a modulation processing unit, and a digital data recording device for recording the output of the modulation system processing unit on a first recording medium. , A mode input means for inputting a switching signal for selecting the first mode and the second mode, and the output of the compression processing means when the first mode is selected, and the output of the compression processing means when the second mode is selected. A digital signal recording / reproducing apparatus characterized in that switching means for outputting the output of the demodulation system processing means to the modulation system processing means is provided between the compression processing means and the modulation system processing means. 3. A data group obtained by inputting digital data, forming a predetermined number of said digital data as a data group, and compressing said data group within a time shorter than the time required for inputting said data group. A digital data recording device for generating a signal for recording on a medium and recording the signal on a recording medium, comprising: a first recording medium, a second recording medium, and a second recording medium on which compressed data is recorded. A demodulation system processing means including a demodulation means for performing a demodulation processing of a reproduction signal and a correction processing means for performing an error correction processing by a correction code added to the data, and a decompression processing means for decompressing the output of the demodulation system processing means. A digital data reproducing device, a compression processing means for compressing digital input data, and a correction code for adding an error correction code to the output of the compression processing means. A digital data recording / reproducing apparatus having two units, a modulation system processing unit including an addition unit and a modulation unit, and a digital data recording device for recording the output of the modulation system processing unit on a first recording medium, Mode input means for inputting a switching signal for selecting the first mode and the second mode, and the output of the modulation system processing means when the first mode is selected, and when the second mode is selected Switching means for outputting the reproduction signal read from the second recording medium for recording on the first recording medium is provided between the modulation system processing means and the first recording medium. Digital signal recording / reproducing device. 4. A modulation processing step comprising a compression processing step of compressing input data, a correction code adding step of adding an error correction code to the compressed data, and a modulation processing step of modulating. A digital data recording method for recording the modulation system processing output on a first recording medium, which comprises a mode input step of inputting a switching signal for selecting the first mode and the second mode, When the mode is selected, the output of the compression processing step is output, and when the second mode is selected, the switching determination step of sending the external compressed data to the modulation processing step and the reliability of the external compressed data are shown. When the first mode is selected and the flag signal input step of inputting a flag signal, the correction code addition step is performed on the data indicating that the flag signal has low reliability. And a step of switching the correction code addition processing so as to add the correction code that becomes uncorrectable when the correction processing is performed. 5. The correction code adding means according to claim 1, further comprising a flag signal input means for inputting a flag signal indicating the reliability of the external compressed data, and wherein the correction code adding means is provided when the second mode is selected. A digital signal recording device, characterized in that the correction code adding process is switched so that a correction code that cannot be corrected when the correction process is performed is added to data indicating that the flag signal has low reliability. 6. The correction method according to claim 2, wherein a flag signal indicating the reliability of the data of the error correction processing by the demodulation processing means is input and the correction is performed when the second mode is selected. The code addition means switches the correction code addition processing so as to add a correction code that cannot be corrected when the correction processing is performed to the data indicating that the flag signal has low reliability. Signal recording / reproducing device. 7. The asynchronous system according to claim 1, further comprising: between the external data input means and the switching means, absorbing asynchronousness between the external compressed data and the operation timing in the digital signal recording device. A digital signal recording device comprising absorption means. 8. The control clock system according to claim 2, wherein the output of the demodulation system processing means and the output of the compression processing means are different between the demodulation system processing means and the switching means. A digital signal recording / reproducing apparatus characterized by comprising an asynchronous absorbing means for absorbing an asynchronous property caused by being output by a device operating in (1). 9. The reproduction signal read from the second recording medium and the output of the modulation system processing means between the second recording medium and the switching means according to claim 3. , A digital signal recording / reproducing apparatus characterized by comprising an asynchronous absorption means for absorbing an asynchronous property caused by being output by a device operating with a different control clock system. 10. A position designation signal for designating at which position on the first recording medium the external compressed data is to be recorded with a signal corresponding to the external compressed data according to claim 1. Position designation signal input means, and the second
And a medium access control means for adjusting the access position to the first recording medium to the position indicated by the position designation signal when the mode is selected. 11. The position signal reproducing means for reproducing the position signal according to claim 2, wherein a position signal indicating a position on the second recording medium is recorded on the second recording medium. A digital signal recording / reproducing apparatus, comprising: medium access control means for adjusting an access position for the first recording medium to a position indicated by the position designation signal when the second mode is selected. . 12. The position signal reproducing means for reproducing the position signal according to claim 3, wherein a position signal indicating a position on the second recording medium is recorded on the second recording medium. A digital signal recording / reproducing apparatus, comprising: medium access control means for adjusting an access position for the first recording medium to a position indicated by the position designation signal when the second mode is selected. .