JPH0737327A - Recording and reproducing device - Google Patents

Abstract

PURPOSE:To accurately eliminate an error generated during dubbing with a simple control regardless of a data transfer rate from a regenerative system to a recording system. CONSTITUTION:The unit of the access of a CD is represented by one sub-code frame, and the unit of the compression of an MD is represented by one sound group. The position of retries, where breaks at every sub-code frame and breaks at every sound group coincide with each other, occur at every 128 sub-code frame in the CD and every 147 sound group in the MD. On the other hand, the minimum recording unit of the MD is represented by one cluster (176 sound groups). When an error is generated during the recording of the cluster 3 of the MD, an access is conducted at a position A as the position of the retry immediately before the error is generated in the CD, and the access is performed at the head of the cluster 3 and dubbing is restarted in the MD. Data recording in the latter half of a cluster 2 are made ineffective so as to be reproduced.

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 invention of claim 1 and a reproducing system for reading digital data from a first recording medium and compressing the digital data. A recording / reproducing apparatus having a recording system for recording on a second recording medium is characterized by including at least the following means. That is,
(1) Storage means (for example, shock proof memory) for temporarily storing the compressed data compressed by the recording system,
(2) Recording means (for example, system control microcomputer, memory controller, encoder / decoder) that intermittently reads a group of compressed data as a minimum recording unit from the storage means and sequentially writes the minimum recording unit to the second recording medium. (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 based on the detection Stop command means (for example, a system control microcomputer) for temporarily stopping the operations of the recording system and the reproducing system, (4) breaks in digital data for each access unit in the first recording medium, and compression units in the recording system The digital data breaks for each When the break position to be set is the retry position, the reproduction system is controlled so as to access the retry position immediately before the reproduction position at the time of the error occurrence on the first recording medium, and the reproduction and recording are restarted from the retry position. Retry control means for controlling the reproduction system and the recording system (for example, a system control microcomputer).

In order to solve the above-mentioned problems, a recording / reproducing apparatus according to a second aspect of the present invention further comprises the following means in addition to the configurations of (1) to (3) described in the first aspect. It is characterized by being. That is, (4) when the break position where the digital data break for each access unit in the first recording medium and the break for digital data for each compression unit in the recording system match each other is the retry position, On the recording medium, a retry control means for controlling the reproduction system so as to access the retry position immediately before the reproduction position at the time of the error occurrence, and for controlling the reproduction system so as to restart the reproduction from the retry position (for example,
(System control microcomputer), (5) In the second recording medium, the minimum recording unit including the retry position is detected, and the compressed data recorded after the retry position in the detected minimum recording unit is invalidated. Recording system control means (for example, a system control microcomputer) that controls the recording system and controls the recording system to restart recording from the beginning of the minimum recording unit following the minimum recording unit that includes the retry position.

[0010]

According to the structure of the first aspect, when either a reproduction error or a recording error occurs, the stop command means detects the error to suspend the operation of the recording system and the reproducing system.

Since an error occurs at a random time point, on the first recording medium, at the time of error occurrence, a group of digital data, which is a unit of access, is usually reproduced. Therefore, the second
When the minimum recording unit of the recording medium is set to be different from the access unit of the first recording medium, the second recording unit is searched when the access unit is searched and reproduction and recording are restarted. A complicated control for adjusting the recording start timing of the medium is required.

Therefore, attention is paid to, as a retry position, a break at which the break in the digital data for each access unit in the first recording medium and the break in the digital data for each compression unit in the recording system coincide with each other. If the reproduction and recording are performed again, the compression processing and the recording operation of the recording means are not hindered,
Moreover, the control operation of the retry control means can be simplified.

According to the structure of claim 2, after an error occurs,
If the recording is restarted from the beginning of the minimum recording unit on the second recording medium, the recording start position can be easily accessed.
The control of the recording system is further simplified. However, since the reproducing system accesses the retry position immediately before the reproducing position at the time of the error occurrence on the first recording medium, the reproduced digital data is reproduced again from the retry position. Therefore, in the second recording medium, the recording content of the minimum recording unit including the retry position and the recording content of the minimum recording unit for restarting recording partially overlap.

Therefore, the recording system control means detects the minimum recording unit including the retry position, and controls the recording system so as to invalidate the compressed data recorded after the retry position within the detected minimum recording unit. By doing so, duplication of audio information can be avoided. As a specific example of controlling the recording system so as to invalidate the recorded compressed data, the TOC information of the second recording medium is read so as to skip from the retry position of the detected minimum recording unit to the end of the minimum recording unit. Can be considered.

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.

[0016]

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, in the MD recording / reproducing system, a disc 31 as an MD (second recording medium according to the claims) is mounted, 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 22.

On the other hand, the CD reproducing system is equipped with a disk 21 as a CD (first recording medium described in the claims) and a CD reproducing device 20. The CD reproducing device 20 performs normal reproduction of the disc 21 while being controlled by the system control microcomputer 9, and when dubbing audio information of the disc 21 to the disc 31, reads audio information from the disc 21 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 a recording means, a stop command means, a retry control means and a 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 described above, when the audio information of the disc 21 is dubbed to the disc 31, the reading speed of the disc 21 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 shockproof 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.

When recording on the disk 31 is completed, 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 a CD to an 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 sec Access unit = per 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 recording unit = cluster unit As described above, the access unit is 1 sub in the CD. Code frame = 588 sampling data, MD compression unit is 1 sound group = 512 sampling data, so it is easy to perform retry processing because of a break for each sub code frame and a break for each sound group. Bets are matched positions. The coincident position will be referred to as a "retry position" hereinafter, and a group of data belonging to a retry position to a next retry position will be referred to as a "retry unit".

The units of retries are 588 and 5
75264 sampling data corresponding to the least common multiple of 12 is included. That is, 75264 = 588 × 128 ... CD case = 512 × 147 ... MD case, so that the retry position is 128 subcodes for CD as shown in FIGS. It will appear every frame, and MD will appear every 147 sound groups.

4C and 4D show the relationship between the access position (-) on the CD and the recording start position or end position ((a)-(d)) on the MD when the retry process is performed. Is shown conceptually.

At the actual recording timing in the MD recording / reproducing system, as shown in FIG. 1B, first, the audio data transmitted from the CD reproducing device 20 to the audio decompression / compression circuit 7 is about 176 sound groups. The compressed audio data is compressed to 1/5 and the compressed audio data is stored in the memory controller 5.
Is written from the voice expansion / compression circuit 7 to the shock proof memory 6. As shown in FIGS. 1B and 1C, while the compressed audio data belonging to the cluster 1 is being written in the shock proof memory 6, the disc 31 (MD) is searched for the recording start position of the cluster 1. It is being appreciated.

Next, 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 out from the shock proof memory 6 at a rate higher than the writing rate, and is written on the disk 31. Will be recorded. Then, by the time the writing of the cluster 2 to the shock proof memory 6 is completed, the disk 3
In 1, the search for the recording start position of the cluster 2 is performed. When the cluster 2 is completely recorded on the disc 31, as shown in FIG.
D), in the middle of 128 subcode frame 3 (see FIG. 1).
The reproduction up to the position B in (a) is completed.

Here, it is assumed that when the cluster 3 is recorded on the disk 31, a shock is applied from the outside, for example, so that the track of the optical pickup 32 deviates and the sound skipping in the CD reproducing device 20 occurs. 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 reproduction up to the position B is normally performed on the disc 21, and the cluster 2 is reproduced on the disc 31.
Since the recording up to the above is normally performed, if the reproduction of the disk 21 is restarted from the position B and the recording of the disk 31 is restarted from the cluster 3, the recording error of the disk 31 is eliminated and the audio information is continuous. Become.

However, the position B is not the retry position described above, but is in the middle of the subcode frame. Therefore, to reproduce exactly from the position B,
The system control microcomputer 9 recognizes which frame of the subcode frame the position B is,
After searching the position B, complicated control for adjusting the timing to start recording on the disc 31 is required.

Therefore, in order to facilitate the retry process, the disk 21 accesses the leading position of the 128 subcode frame 3 (shown by position A in FIG. 1A) which is the retry position. In addition, in the disk 31,
As shown in, the recording start position of the cluster 3 is accessed. In this way, in the cluster 3, the compressed audio data recorded after the position B of the 128 subcode frame 3 is rewritten to the compressed audio data from the position A.

However, as shown in FIGS. 1 (a) and 1 (b),
Since the compressed audio data corresponding to the positions A to B on the disc 21 has already been recorded in the latter half of the cluster 2 on the disc 31, in the above process, the latter half of the cluster 2 and the first half of the cluster 3 are recorded. The same data will be recorded in duplicate. Therefore, as shown in FIG. 3, if the overlapping portion recorded in the latter half of the cluster 2 is invalidated on the TOC information indicating the reproduction procedure of the disc 31, the overlapping reproduction can be avoided.

The system control microcomputer 9 sends the TOC information for invalidating the overlapped portion to the U on the disk 31.
-To record in the TOC area, the user can
You can always enjoy normal playback just by mounting 1 on the MD recording / playback system. Further, since the shock proof memory 6 absorbs the time for skipping over the overlapping portion of the cluster 2 without reproducing it, the sound interruption does not occur.

[0042]

The recording / reproducing apparatus according to the invention of claim 1
As described above, the storage means for temporarily storing the compressed data compressed by the recording system, and the batch of compressed data are intermittently read from the storage means as the minimum recording unit, and the minimum data is stored in the second recording medium. A recording unit that sequentially writes recording units, and 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 stopped based on the detection. Stop command means for causing the above-mentioned first
When the retry position is a cut point of the digital data for each access unit of the recording medium and the cut point of the digital data for each compression unit of the recording system, when an error occurs on the first recording medium And a retry control means for controlling the reproduction system and the recording system so as to restart reproduction and recording from the retry position. is there.

Therefore, the reproduction and the recording are restarted from the retry position where the break of the digital data for each access unit in the first recording medium and the break of the digital data for each compression unit in the recording system match each other. The error can be resolved with simple control contents. Further, since the operations of the reproducing system and the recording system are temporarily stopped at the time of the error occurrence, the error can be eliminated accurately even when the data transfer rate from the reproducing system to the recording system is high. .

In the recording / reproducing apparatus according to the second aspect of the present invention, as described above, the storage means for temporarily storing the compressed data compressed by the recording system, and the minimum amount of compressed data from the storage means are minimized. Recording means for intermittently reading as a recording unit and sequentially writing a 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, Stop command means for temporarily stopping the operations of the recording system and the reproducing system based on the detection;
When the retry position is a cut point of the digital data for each access unit of the recording medium and the cut point of the digital data for each compression unit of the recording system, when an error occurs on the first recording medium Retry control means for controlling the reproduction system so as to access the retry position immediately before the reproduction position, and for controlling the reproduction system so as to restart the reproduction from the retry position,
In the second recording medium, the minimum recording unit including the retry position is detected, the recording system is controlled so as to invalidate the compressed data recorded after the retry position within the detected minimum recording unit, and the retry is performed. The recording system control means controls the recording system so as to restart recording from the beginning of the minimum recording unit next to the minimum recording unit including the position.

Therefore, in the recording system, since the recording is restarted from the head of the minimum recording unit, the recording start position can be easily accessed, and the error can be eliminated with the control content simpler than that of the structure of claim 1. Moreover, since the recording system control means controls the recording system so as to invalidate the compressed data recorded after the retry position within the minimum recording unit, the reproduction is restarted from the retry position immediately before the reproduction position at the time of the error occurrence. Even if it is done, the contents reproduced from the second recording medium do not overlap with each other, and there is an effect that an accurate error is solved.

[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 is a timing chart showing that dubbing is restarted by matching a data break for each access unit in a CD with a data break for each minimum recording unit in an MD.

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

4 (a) and (b) are explanatory diagrams showing a relationship between a data break for each access unit in a CD and a data break for each compression unit in an MD, and (c) and (d) of FIG.
The access position on the CD during the retry process and the MD
It is explanatory drawing which shows the relationship with the above recording start position.

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

[Explanation of symbols]

5 shock proof memory controller (recording means) 6 shock proof memory (storage means) 9 system control microcomputer (recording means, stop command means, retry control means and recording system control means) 15 head drive circuit (recording means) 16 recording head ( Recording means) 20 CD reproducing device (reproducing system) 21 Disc (first recording medium) 31 Disc (second recording medium) 32 Optical pickup (recording means) 34 Encoder / decoder signal processing circuit (recording means)

Claims (2)

[Claims] 1. A recording / reproducing apparatus comprising a reproducing system for reading digital data from a first recording medium and a recording system for compressing the digital data and recording the compressed digital data on a second recording medium. Storage means for temporarily storing compressed data; recording means for intermittently reading a set of compressed data as a minimum recording unit from the storage means, and sequentially writing the minimum recording unit on the second recording medium; A stop command means for detecting at least one of a reproduction error in the recording medium and a recording error in the second recording medium, and temporarily stopping the operations of the recording system and the reproduction system based on the detection, and the first recording medium. The digital data break for each access unit and the digital data break for each compression unit in the recording system are mutually When the cut position coincides with the retry position, the reproduction system is controlled to access the retry position immediately before the reproduction position at the time of the error occurrence on the first recording medium, and the reproduction and recording are performed from the retry position. A recording / reproducing apparatus comprising a retry control means for controlling the reproducing system and the recording system so as to restart. 2. A recording / reproducing apparatus comprising a reproducing system for reading digital data from a first recording medium and a recording system for compressing the digital data and recording the compressed digital data on a second recording medium, wherein the recording system compresses the digital data. Storage means for temporarily storing compressed data; recording means for intermittently reading a set of compressed data as a minimum recording unit from the storage means, and sequentially writing the minimum recording unit on the second recording medium; A stop command means for detecting at least one of a reproduction error in the recording medium and a recording error in the second recording medium, and temporarily stopping the operations of the recording system and the reproduction system based on the detection, and the first recording medium. The digital data break for each access unit and the digital data break for each compression unit in the recording system are mutually When the cut position that coincides with the first position is set as the retry position, the reproduction system is controlled so as to access the retry position immediately before the reproduction position at the time of the error occurrence, and the reproduction is restarted from the retry position. Retry control means for controlling the reproduction system as described above, and detecting the minimum recording unit including the retry position in the second recording medium, and invalidating the compressed data recorded after the retry position within the detected minimum recording unit. And a recording system control means for controlling the recording system so as to restart the recording from the beginning of the minimum recording unit next to the minimum recording unit including the retry position. Recording and reproducing device.