JPH0737341A - Recording and reproducing apparatus - Google Patents

Abstract

PURPOSE:To perform dubbing without data break regardless or data transfer speed and the difference in recording format between recording media even if an error occurs during dubbing. CONSTITUTION:A clustor MD is the minimum recording unit and comprises a plurality of compressed units (sound group). For example, when an error occurs during the recording of a sound group 27 of a clustor 3, dubbing is once stopped. A synchronizing signal for every sub-code frame (access unit) is detected with CD, reproduction is restarted from the sub-code frame two steps before the position, where the error has occurred, and the new compression data are generated. In an MD-recording and reproducing system, the new compressed data and the compressed data of the clustor 3 stored in a buffer memory are verified. The buffer memory is rewritten from the sound group 27, wherein the error has occurred. Thereafter, the recording is restarted from the head of the clustor 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention compresses audio data generated from a digital audio signal of continuous information such as audio information, temporarily stores it in a buffer memory, and transfers it at a transfer rate higher than that at the time of storage. The present invention relates to a recording / reproducing apparatus for intermittently reading audio data from a buffer memory and performing high density recording on a recording medium, and more particularly to a recording / reproducing apparatus for dubbing audio information from a compact disc reproducing system to a mini disc recording system. .

[0002]

2. Description of the Related Art In the last ten years, the recording / reproducing system for audio signals has been rapidly shifting from an analog system to a digital system. Consumer-use recording media include compact discs (hereinafter referred to as CDs), which are reproduction-only optical discs for digital audio signals, digital compact cassettes, which are recording / reproducing magnetic tapes, and recording / reproducing devices.
Mini disks (hereinafter referred to as MD), which are magneto-optical disks capable of reproduction / erasure, have been developed. MD above
Is smaller than the CD and has a diameter of about 1/2 that of the CD.
Has become. Further, the digital audio signal recorded on the MD has an ATRAC (Adaptive Transform Acoustic Codi
data is compressed to about 1/5 by an audio high-efficiency encoding method called ng).

Even in the digital type driving device which handles the above recording medium, two types of recording mediums are mounted,
There is a demand for a dubbing function capable of transcribing audio information from one recording medium to the other recording medium.
For example, JP-A-4-332960 and JP-A-4
Japanese Patent No. 258834 discloses a recording / reproducing apparatus capable of dubbing a compressed digital audio signal recorded on an MD at high speed.

Further, Japanese Patent Laid-Open No. 3-119559 discloses a processing method when a reproduction error occurs on the CD side when dubbing audio information from a CD to an analog compact cassette.

[0005]

However, the above-mentioned JP-A-4-332960 and JP-A-4-258834.
The publication does not disclose any retry method for eliminating an error so that the dubbed audio information is not interrupted when a reproduction error or a recording error occurs.

Further, Japanese Patent Laid-Open No. 3-119559 mentioned above discloses a process for restarting dubbing after returning to an error occurrence position on each recording medium, but the recording side is an analog system and continuous analog recording is performed. Since the audio signal is recorded, it is difficult to perform strict continuous recording at the error occurrence position.

Further, as in the case of dubbing audio information from CD to MD, it is conceivable to transfer a digital audio signal between recording media having different recording formats. In this case, when a recording error or a reproduction error occurs, establishing a retry technique for re-dubbing from the error occurrence position so as to prevent interruption or duplication of audio information is a future task.

[0008]

In order to solve the above-mentioned problems, a recording / reproducing apparatus according to the present invention digitally records digital data from a first recording medium (for example, a CD) on which digital data is sequentially recorded for each access unit. A recording / reproducing apparatus including a reproducing system for reading out data and a recording system for compressing the digital data and recording the compressed digital data on a second recording medium (for example, MD) is provided with at least the following means. There is. That is, (1) storage means (for example, shock proof memory) that temporarily stores the compressed data compressed by the recording system for each compression unit, (2) a plurality of compression units as the minimum recording unit, Recording means for intermittently reading compressed data from the storage means and sequentially recording a minimum recording unit on the second recording medium (for example, system control microcomputer, memory controller, encoder / decoder signal processing circuit, head drive circuit, recording (Head and optical pickup), (3) at least one of a reproduction error in the first recording medium and a recording error in the second recording medium is detected, and the operation of the recording system and the reproduction system is temporarily performed based on the detection. Stop command means for stopping (for example, system control microcomputer), (4) above-mentioned first statement A reproduction control unit that detects which access unit in the recording medium an error has occurred during reproduction and causes the reproduction system to restart the reproduction from the access unit that is a plurality of access units before the access unit in which the error has occurred (for example, (System control microcomputer), (5) The compressed data corresponding to the access unit at which the reproduction is restarted is discriminated from the storage means and read out, and is verified with the new compressed data obtained after the restart of the reproduction. Verifying means (for example, a system control microcomputer) for detecting each head position of the compression unit in (6), based on the detection result of the verifying means, a new error is generated in the storage means from the head of the compression unit in which the error occurs Storage control means for rewriting compressed data (eg shockproof memory controller), (7) Error The compressed data from the beginning of the minimum recording unit generated by reading from the storage means, recording control means for resuming the recording to the second recording medium to the recording system (e.g., system control microcomputer).

[0009]

According to the above construction, the digital data read from the first recording medium for each access unit is compressed by the recording system and stored in the storage means for each compression unit. However, the data length of the access unit and the data length of the compression unit do not have to match. Since a plurality of compression units are recorded as the minimum recording unit on the second recording medium, when at least the compressed data for at least the minimum recording unit is stored in the storage means, it is read from the beginning of the minimum recording unit. The data is recorded on the second recording medium.

Therefore, if an error occurs during recording of a certain minimum recording unit, at least the compressed data of the minimum recording unit in the recording is stored in the storage means for each compression unit. Therefore, if the reproduction of the first recording medium is restarted after the error occurs and the newly compressed compressed data can be overwritten on the same compressed data stored in the storage means, Dubbing from one recording medium to the second recording medium via the storage means can be continued regardless of an error.

For that purpose, it is necessary to verify the new compressed data after resuming the reproduction and the compressed data stored in the storage means. As a procedure of this verification, it is detected which access unit in the first recording medium the error occurred during reproduction. The reproduction is restarted from the access unit that is plural times before the access unit in which the error occurred. The compressed data corresponding to the unit of access for which the reproduction is restarted is discriminated and read from the storage means. The compressed data read from the storage means is verified with new compressed data obtained after the reproduction is restarted. Each start position of the unit of compression in this new compressed data is detected, and the corresponding storage position of the storage means is confirmed. New compressed data is double-written from the beginning of the compression unit in which the error has occurred to the storage means. In this way, after all the compressed data of the minimum recording unit in which an error has occurred have been double-written in the storage means, the compressed data from the beginning of the minimum recording unit is read from the storage means and recorded on the second recording medium. By restarting, the dubbing can be continued regardless of interruption due to an error.

The above control and the above control are performed by the reproduction control means, the above control and the above control are performed by the verifying means, and the above control and the above control are performed by the storage control means.

As described above, according to the present invention, even if the recording formats of the first recording medium and the second recording medium are different, the digital data of the first recording medium is dubbed to the second recording medium. The error that occurred inside can be resolved with simple control contents. Moreover, since the operations of the reproducing system and the recording system are temporarily stopped when an error occurs, it can be applied to the case where the digital data is transferred from the reproducing system to the recording system at a speed higher than the normal reproducing speed.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The following will describe one embodiment of the present invention with reference to FIGS. However, in the present embodiment, as an example of the recording / reproducing apparatus according to the present invention,
A recording / reproducing system which is provided with an MD recording / reproducing system for recording / reproducing audio information to / from an MD and a CD reproducing system for reproducing audio information from a CD so that audio information can be dubbed from the CD to the MD The device will be described.

As shown in FIG. 5, the MD recording / reproducing system is equipped with a disc 31 as an MD (second recording medium according to the claims), an optical pickup 32, and an RF.
An amplifier 33, an encoder / decoder signal processing circuit 34,
Shockproof memory controller (hereinafter referred to as memory controller) 5, shockproof memory (buffer memory) 6, audio decompression / compression circuit 7, D / A / A
/ D converter 8, system control microcomputer (hereinafter referred to as system control microcomputer) 9, servo circuit 10, driver circuit 11, spindle motor 12, feed motor 13, power ON / OFF circuit 14, head drive circuit 15, recording head 16, audio output terminal 17, audio input terminal 18, changeover switch 19,
And a key discrimination circuit 42.

On the other hand, the CD reproducing system is equipped with a CD 41 as a CD (first recording medium according to the claims) and a CD reproducing device 20. The CD reproducing device 20 performs normal reproduction of the disc 41 while being controlled by the system control microcomputer 9, and when dubbing audio information of the disc 41 to the disc 31, reads audio information from the disc 41 at a higher speed than during normal reproduction. Controlled as.

When the disc 31 is reproduced, the disc 31
Is a spindle motor 1 driven by a driver circuit 11.
It is rotationally driven by 2. The optical pickup 32 that reads the audio data recorded on the disc 31 is
The disc 31 is fed in the radial direction by the feed motor 13 driven by the driver circuit 11. Further, the objective lens of the optical pickup 32 is driven in the focusing direction and the tracking direction by an actuator (not shown) driven by the driver circuit 11.

The audio data read by the optical pickup 32 is amplified by the RF amplifier 33 and sent to the encoder / decoder signal processing circuit 34. Also,
The RF amplifier 33 generates a servo control signal such as a focus error signal or a tracking error signal from the read audio data, and outputs this to the servo circuit 10.

The servo circuit 10 receives the servo control signal from the RF amplifier 33 and the control signal from the system control microcomputer 9, and then the optical pickup 3
The driver circuit 11 is controlled so as to servo the focusing and tracking in 2 and the rotation speed of the disk 31. Further, the driver circuit 11
Drives the optical pickup 32, the spindle motor 12, and the feed motor 13 by the control signal from the servo circuit 10.

The encoder / decoder signal processing circuit 3
Reference numeral 4 demodulates the audio data amplified by the RF amplifier 33, further performs signal processing such as error correction, and sends it to the memory controller 5. The memory controller 5 writes the audio data sent from the encoder / decoder signal processing circuit 34 in a shock proof memory 6 as a storage means. In the shock proof memory 6, in addition to the area for storing audio data, the TO
A disc 31 is provided with an area for storing C information.
When the disc is inserted into the device, the TOC is immediately removed from the disc 31.
The information is read out and stored in a predetermined area of the shock proof memory 6 along the same path as the audio data. Further, the memory controller 5 reads out necessary TOC information from the shock proof memory 6 in response to a request from the system control microcomputer 9 and sends it to the system control microcomputer 9.

The system control microcomputer 9 constitutes the recording means, the stop command means, the retry control means and the recording system control means described in the claims, controls the present system based on the TOC information, and records necessary data on the disc. Read from 31. The memory controller 5 sequentially reads the audio data temporarily stored in the shock proof memory 6 and sends it to the audio decompression / compression circuit 7. The voice decompression / compression circuit 7 decompresses the transmitted audio data according to a predetermined format in the voice decompression circuit to decompress and sends it to the D / A / A / D converter 8. The D / A / A / D converter 8 analog-converts the sent digital signal in the D / A converter to generate an audio signal. This audio signal is output from the output terminal 17.

On the other hand, when the audio information is recorded on the disc 31, the audio information may be input from an analog source or may be input from the CD reproducing device 20 as described above. Switching of this input system,
This is performed by a changeover switch 19 controlled by the system control microcomputer 9.

When audio information is input from an analog source, an analog audio signal is input to the A / D converter of the D / A / A / D converter 8 via the audio input terminal 18 and converted into audio data. It
However, from the speed at which the audio data is transferred from the A / D converter to the audio decompression / compression circuit 7, the CD playback device 2
The speed of transferring the digital audio signal from 0 to the voice decompression / compression circuit 7 is faster. This is because, as already described, when the audio information of the disc 41 is dubbed to the disc 31, the reading speed of the disc 41 becomes higher than that during normal reproduction.

The audio decompression / compression circuit 7 uses the audio compression circuit to output ATRAC (Adaptive Transform Acoustic).
The audio data input through the changeover switch 19 is compressed to about 1/5 by the MD information compression technique called Coding) and sent to the memory controller 5.
The memory controller 5 once writes the input compressed audio data into the shock proof memory 6,
The compressed audio data is read from the shock proof memory 6 and sent to the encoder / decoder signal processing circuit 34. Here, modulation, addition of error correction code, and the like are performed.

The system control microcomputer 9 controls the memory controller 5 to control the shock proof memory 6
The recordable area on the disk 31 is recognized from the TOC information stored in the disk, and the servo circuit 10 is controlled to search the recordable area. When the search of the recordable area is completed, the head drive circuit 15 drives the recording head 16 based on the signal output from the encoder / decoder signal processing circuit 34 under the control of the system control microcomputer 9. At the same time, the driver circuit 11 drives the laser circuit of the optical pickup 32 to irradiate the magnetic field application portion of the disc 31 with a laser stronger than that at the time of reproduction, so that the modulated data is recorded on the disc 31. The optical pickup 32, the encoder / decoder signal processing circuit 34, the memory controller 5, the head drive circuit 1
The recording head 5 and the recording head 16 compose the recording means described in the claims.

Upon completion of recording on the disk 31, the system control microcomputer 9 causes the memory controller 5 to
Is controlled to rewrite the TOC information stored in the shock proof memory 6 and use it as the latest TOC information to manage the audio information recorded on the disc 31. For example, the TOC area (called U-TOC area) provided on the inner circumference side of the disk 31 can be rewritten with the latest TOC information.

In the above structure, when dubbing audio information from the CD to the MD, the dubbing speed becomes higher than the normal speed not only when a reproduction error occurs on the CD side but also when a recording error occurs on the MD side. As a result, the possibility that the shock proof memory 6 cannot absorb the rewriting time increases. Therefore, in order to continuously record the compressed audio data so that the recording is not interrupted at the error occurrence location, a retry process is required to access the error occurrence location on the CD and MD respectively.

Here, a problem is that the recording format is different between the CD and the MD. The respective parameters are summarized below.

[CD] 1 frame = 6 sampling data 1 subcode frame = 98 frames = 588 sampling data = 1/75 seconds Access unit = each subcode frame [MD] 1 sound group = 512 sampling data (compression unit ) 1 sector = 5.5 sound group = 2816 sampling data 1 cluster = 32 sectors = 176 sound group = 90112 sampling data Access unit = sector sector Minimum recording unit = cluster unit In this way, the data length of the access unit in the CD Is different from the data length of the compression unit in MD, or the data length of the access unit and the minimum recording unit, the CD reproduction restart timing and the MD recording restart timing are adjusted during the retry process. Control It becomes essential. Therefore, in order to facilitate this control, FIG.
As shown in (a) to (c), the system control microcomputer 9 counts each time one audio group of audio data (512 sampling data) is read from the CD reproducing device 20, and counts the audio data in sound group units. It is good to manage.

In the dubbing operation from the CD reproducing system to the MD recording / reproducing system, as shown in FIGS. 2 (a) and 2 (b), at the same time when audio data is read from the disc 41 (CD), the MD recording / reproducing system is operated. The audio data transmitted to the audio decompression / compression circuit 7 is compressed to about ⅕ for each sound group and sequentially written in the shock proof memory 6 by the memory controller 5.

Further, as shown in FIG. 2C, until the compressed audio data belonging to the cluster 1 which is the first recording unit to be recorded on the disc 31 (MD) is written in the shock proof memory 6, the disc 31 is recorded. Then
The recording start position of the cluster 1 is searched.

Next, at the same time when the writing of the cluster 1 to the shock proof memory 6 is completed and the writing of the cluster 2 is started, the cluster 1 is read from the shock proof memory 6 at a rate higher than the writing rate, and the disk is read. It is recorded in 31. As described above, since the reading speed from the shock proof memory 6 is faster than the writing speed, the reading of the compressed audio data from the shock proof memory 6 is performed intermittently. As a result, after reading the compressed audio data of the cluster 1 from the shock proof memory 6, the shock proof memory 6
During the period until the writing of the cluster 2 is completed, the recording start position of the cluster 2 is searched on the disc 31. At the time when the cluster 2 has been recorded on the disk 31, the reproduction up to the middle of the cluster 3 is completed on the disk 41.

Next, as shown in FIGS. 2A and 2B, when the compressed audio data up to the point A of the cluster 3 is recorded on the disk 31, for example, a shock is applied from the outside, and therefore the optical pickup 32. Track deviation, C
It is assumed that sound skipping occurs in the D playback device 20. That is, in this case, the minimum recording unit in which the error has occurred is the cluster 3. At this time, the system control microcomputer 9 detects a recording error or a reproduction error, temporarily stops the recording operation of the MD recording / reproducing system and the reproducing operation of the CD reproducing device 20, and starts the retry process.

In this case, the recording up to the cluster 2 is normally done on the disc 31, and the compressed audio data of the cluster 3 is normally written in the shock proof memory 6. If the reproduction is resumed after returning a little from the reproduction position at the time when the error occurs on the disc 41, the newly obtained compressed audio data will overlap with the compressed audio data stored in the shock proof memory 6. Therefore, it is confirmed that the compressed audio data stored in the shock proof memory 6 and the newly obtained compressed audio data match each other, and the shock proof memory 6 is confirmed.
The error can be eliminated by writing over the same compressed audio data of.

In this way, after the double writing of the cluster 3 in the shock proof memory 6 is completed, if the cluster 3 is read from the beginning and re-recorded on the disk 31 and the dubbing of the cluster 4 and the subsequent continues normally, an error occurs. The compressed audio data can be continuously dubbed onto the disk 31 without being affected by the above.

The verification of the new compressed audio data after resuming the reproduction and the compressed audio data already stored in the shockproof memory 6 will be specifically described below.

First, in consideration of the compression format of the compression LSI used in the audio decompression / compression circuit 7, in the disk 41, for example, a sound group two points before the point A (in this embodiment, as shown in FIG. The reproduction is restarted from the sound group 25) as shown in b). However,
Since the unit of CD access is one subcode frame, the disc 41 actually accesses the beginning of the subcode frame two frames before. Disc 41
1A, a synchronization signal (subcode frame sync) reproduced from the beginning of each subcode frame is used for the access. In the present embodiment, the system control microcomputer 9 searches the subcode frame sync 21 and causes the CD reproducing device 20 to resume the reproduction of the disc 41.

Next, the system control microcomputer 9
Is based on the correspondence between the data in the subcode frame starting from the subcode frame sync 21 and the data in the sound group 25, after the reproduction of the disc 41 is restarted, a new output from the audio decompression / compression circuit 7 is generated. The compressed audio data corresponding to the compressed audio data is discriminated and read from the shock proof memory 6. And
By verifying the new compressed audio data and the stored compressed audio data, as shown in FIG.
As shown in, the sound group 26 before the point A
Detect the beginning of. In this way, after confirming the storage position of the shock proof memory 6, as shown in FIG.
The memory controller 5 is instructed to resume writing to the shock proof memory 6 from the sound group 27, which is the unit of compression in which the error has occurred. As a result, the compressed audio data from the sound group 27 to the sound group 176 of the cluster 3 is double written.

Until the compressed audio data of the cluster 3 is completely written in the shock proof memory 6,
On the disc 31, the recording start position of the cluster 3 is searched. At the time when the cluster 3 has been written to the shock proof memory 6, as shown in FIG.
Recording is restarted from the beginning of the cluster 3. Thus
The audio data of the disc 41 is continuously dubbed to the disc 31 without being affected by the error.

When the data transfer speed from the CD reproducing system to the MD recording / reproducing system is high, there is a possibility that the shock proof memory 6 cannot absorb the time required for rewriting. Since the operation of the MD recording / reproducing system is temporarily stopped and the rewriting to the shock proof memory 6 is completed, the recording to the MD is restarted, so that the error is surely eliminated regardless of the data transfer speed.

[0041]

As described above, the recording / reproducing apparatus according to the present invention minimizes the storage means for temporarily storing the compressed data compressed by the recording system for each compression unit and the plurality of compression units. A recording unit that intermittently reads compressed data from the storage unit as a recording unit and sequentially records the minimum recording unit on the second recording medium, and at least a reproduction error on the first recording medium and a recording error on the second recording medium. One of the errors is detected, and stop command means for temporarily stopping the operations of the recording system and the reproducing system based on the detected error, and which access unit in the first recording medium the error occurred during reproduction are detected. , A playback control unit that causes the playback system to restart playback from the access unit that is a plurality of access units before the access unit in which the error has occurred, and the compression data corresponding to the access unit that has restarted playback. Reads to determine from the storage means,
Verifying means for verifying the new compressed data obtained after resuming the reproduction and detecting each start position of the unit of compression in the new compressed data, and compression in which an error has occurred based on the detection result of the verifying means. Storage control means for rewriting new compressed data to the storage means from the beginning of the unit, and the compressed data from the beginning of the minimum recording unit in which an error has occurred are read from the storage means, and are recorded in the recording system to the second recording medium. And a recording control means for restarting the recording.

Therefore, even if an error occurs while the audio data is being dubbed from the first recording medium to the second recording medium having a different recording format, it is reproduced from the compression unit immediately before the error and stored. Since the data is rewritten to the means, the audio data can be continuously dubbed on the second recording medium without being affected by the error. Further, since the operations of the reproducing system and the recording system are temporarily stopped at the time of occurrence of the error, there is an effect that the error can be surely resolved even when the data transfer rate from the reproducing system to the recording system is high.

[Brief description of drawings]

FIG. 1 is a timing chart showing a retry process of a recording / reproducing apparatus according to the present invention.

[FIG. 2] Operation for reading audio data from a CD, M
6 is a timing chart showing a relationship between an operation of compressing and storing audio data in a D recording / reproducing system and an operation of recording compressed audio data in an MD.

FIG. 3 is an explanatory diagram showing recorded contents of digital data in an MD after a retry process.

4A and 4B are explanatory diagrams showing that audio data reproduced from a CD is managed with the same data length as a compression unit in MD, and FIG. 4C is a minimum recording unit of MD. It is explanatory drawing which shows data length.

FIG. 5 is a block diagram showing a configuration example of a recording / reproducing apparatus according to the present invention.

[Explanation of symbols]

2 optical pickup (recording means) 4 encoder / decoder signal processing circuit (recording means) 5 shock proof memory controller (recording means and storage control means) 6 shock proof memory (storage means) 9 system control microcomputer (recording means, stop command means) , Reproduction control means, verifying means and recording control means) 15 head drive circuit (recording means) 16 recording head (recording means) 20 CD reproducing device (reproducing system) 31 disc (second recording medium) 41 disc (first recording medium) )

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Claims (1)

[Claims] 1. A reproducing system for reading digital data from a first recording medium on which digital data is sequentially recorded for each access unit, and a recording system for compressing the digital data and recording it on a second recording medium. In a recording / reproducing apparatus, a storage unit that temporarily stores compressed data compressed by the recording system, and a plurality of compression units as a minimum recording unit, and the compressed data is intermittently stored from the storage unit. Recording means for sequentially reading the minimum recording unit on the second recording medium, and detecting at least one of a reproduction error on the first recording medium and a recording error on the second recording medium, and based on the detection. Stop command means for temporarily stopping the operations of the recording system and the reproducing system, and an error occurs during reproduction of which access unit in the first recording medium. From the storage unit that detects whether the error has occurred and a reproduction control unit that causes the reproduction system to restart reproduction from the access unit that is a plurality of access units before the error unit, and compressed data corresponding to the access unit that restarts the reproduction from the storage unit. Based on the detection result of the verifying means for discriminating and reading out, verifying with the new compressed data obtained after resuming the reproduction, and detecting each head position of the unit of compression in this new compressed data, and the verifying means, Storage control means for rewriting new compressed data to the storage means from the beginning of the compression unit in which an error has occurred, and compressed data from the beginning of the minimum recording unit in which an error has occurred are read from the storage means, and stored in the recording system as described above. A recording / reproducing apparatus comprising: a recording control unit that restarts recording on a second recording medium.