JP2003157624A - Disk unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk unit which is free of the problem that a picture or sound of even continuous data like image data or sound data is broken, and has high reliability. SOLUTION: When recording or reproduction ends in failure and is retried, a retrial frequency is calculated from memory capacity for temporary storage and retrial is repeated only at the frequency. Further, the recording speed of an image is lowered to increase the difference in recording speed between a disk and an image and thus the retrial frequency is made high to increase the reliability.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc device using a disc-shaped recording medium such as an optical disc and a control method thereof, and more particularly to a disc device and a control method thereof.

[0002]

2. Description of the Related Art As a disc reproducing apparatus for reproducing a digital signal from a disc-shaped recording medium, for example, a C for reproducing digital audio data from a compact disc (CD).
There is a D player. In this CD player,
By reading the difference in reflectance between the pits and lands that were previously formed on the disc using an optical head,
You are getting a playback signal.

In a disc reproducing apparatus such as this CD player which reproduces a signal by using a disc optical means, operability such as random access is improved as compared with a reproducing apparatus using a tape-shaped recording medium. Further, since the recording medium and the head are not in contact with each other, the recording medium is not deteriorated and the reliability is very high.

However, in such a disc reproducing apparatus, the signal quality of a reproducing optical head for reading a signal from the disc is deteriorated due to dust or defects on the disc, electric noise, vibration, etc., and recorded data is recorded. Cannot be read normally and cannot be played normally (for example,
If it is a CD player, the problem is that the sound is interrupted). Such a problem also occurs in a rewritable disc device, that is, in a disc recording device as well. In the disc recording device, dust or defects on the disc, electrical noise, vibration, etc.
There is a problem that the recording signal from the recording optical head cannot reach the disk normally, and normal recording cannot be performed on the disk.

In order to solve these problems, conventionally, a so-called retry operation has been performed, in which a reproducing or recording operation is performed by scanning again a reproducing or recording area.

[0006]

The above-mentioned retry operation is an effective means for the purpose of recording the recorded data on the disk as reliably as possible, such as a data backup device. The transfer rate of records is reduced. For this reason, if continuous data such as image data such as a movie or audio data is not recorded at a speed higher than a certain transfer speed, the screen may be interrupted or sound may be interrupted. Is not effective.

An object of the present invention is to solve the above-mentioned problems of the prior art and to prevent the problem of screen interruption or sound interruption even in continuous data such as image data or audio data. And to provide a highly reliable disk device.

[0008]

In order to achieve the above object, according to the present invention, an image signal for changing an image signal from an image pickup device into image data, or for displaying the changed image data on a display means. Image signal processing means for changing the data again, and encoding / decoding processing, modulation / demodulation, ECC (Error Correction Code) addition to record image data from the image signal processing means, or recording on a disk-shaped recording medium. Recording / reproducing signal processing means for converting the recording data into a recording format, a memory for temporarily storing the recording data, and recording the recording data on a disk-shaped recording medium or reproducing the recording data in the disk-shaped recording medium. Recording / reproducing means and recording or detecting a recording or reproducing position on the recording medium by an address signal or the like on the recording medium. A raw position detection means and a recording or reproduction position control means for controlling a recording or reproduction position such as focus and tracking control of an optical head, rotation control of a disk, seek control for controlling an address position, and the like are provided. When a recording or reproduction abnormality is detected, the recording or reproduction position control means again
The recording or reproducing position is returned to the position immediately before the recording or reproducing abnormality is detected, and the recording or reproducing operation is tried.

When recording or reproducing cannot be performed even if the above operation is tried once or several times, the recording or reproducing at that position is abandoned, the recording or reproducing position is moved to the next continuous recording or reproducing position, and the recording or reproducing is continued. . In addition, even if the recording or playback position is continuous, if a retry occurs due to dust or defects on the disc, or electrical noise or vibration, and recording or playback fails, the number of retries that occur during a series of operations is counted. , The number of possible retries is calculated from the remaining amount of the memory for temporarily storing the recording data required for the image and the audio data to prevent the disturbance of the image and the skipping of the sound. When the number of retries is exceeded, recording or reproduction is continued without retrying even if an error occurs.

Alternatively, the speed of converting the image or audio signal into digital information may be decreased so that the speed of recording on the disc can be decreased even if the same time recording is performed. As a result, I tried to earn more retries. In the above method, the transfer speed of recording or reproducing on the disc,
Compared with the transfer rate of image and audio data, if the transfer rate of recording or playback is below a certain threshold, more retry operations can be made possible, so that the reliability of recording or playback can be increased. Become.

In the above description, the recording medium is a medium which can be overwritten and recorded. However, the recording medium is not limited to this, and a write-once recording medium capable of recording only once may be used. in this case,
Retry indicates an operation of re-recording from the vicinity of the recording stop position.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of a disk device according to an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a photographing means, which comprises a photographing optical system 2, a CCD (imaging device) 3, an A / D converter 4, etc., and a subject image is formed on the CCD 3 by the photographing optical system 2. Image signal is obtained by CCD3 and this is A / D
It is digitized by the converter 4 and output. Reference numeral 5 is an image signal processing means for converting the image signal from the photographing means 1 into image data. The image signal processing means 5 also processes the voice information signal from the microphone 14 which is the voice information signal input means. It has become. At the time of reproduction, the image signal processing means 5 is adapted to convert the image data from the recording / reproduction signal processing means 6 which will be described later into an image information signal for display output. The audio data from the recording / reproducing signal processing means 6 which will be described later is converted into an audio information signal for audio output. In the case of a video camera, image data and audio data are continuously processed by the image signal processing means 5, and the image quality and sound quality are determined by the processing capacity of the image quality signal processing means 5, and the image signal is processed according to the processing capacity. The transfer rate of the data sent from the processing means 5 to the recording / reproducing signal processing means 6 is determined.

Reference numeral 6 is a recording / reproducing signal processing means for converting the image data (including audio data) from the image signal processing means 5 into recording data according to a recording format for recording on the disc-shaped recording medium 9. Alternatively, in order to convert the recording data reproduced from the disk-shaped recording medium 9 into image data (including audio data), processing such as encoding / decoding processing, modulation / demodulation processing, ECC addition / error correction processing is performed. . The transfer speed of recording or reproducing on the disk is determined by the processing capacity of the recording / reproducing signal processing means 6, the processing capacity of the recording / reproducing means 8, the rotational speed of the disk, and the like. Reference numeral 7 is a memory for temporarily storing the image data (including audio data) from the image signal processing means 5. The memory is stored when the transfer speed of the image data or the audio data transferred from the image signal processing means 7 is higher than the speed of recording on the disk-shaped recording medium 9. Therefore, recording on the disk-shaped recording medium 9 is
It is necessary to record before the amount of storage in the memory exceeds the memory capacity.

Reference numeral 8 is a recording / reproducing means, 9 is a disk-shaped recording medium (optical disk) which is rotationally driven by a spindle motor (not shown), and 10 is a laser source (laser diode).
The recording / reproducing means 8 is an optical head including an optical system, a photodetector, and the like.
The recording data stored in the optical disk 9 is recorded on the optical disk 9, and the recording data reproduced from the optical disk 9 is temporarily stored in the memory 7 by the optical head 10. Reference numeral 11 denotes a servo control necessary for optical recording, for example, focus and tracking control for controlling an actuator (not shown) of the optical head 10 and an SNP motor (not shown).
Rotation control of the disk for controlling the control, seek control for controlling the address position, and the like are performed.

Reference numeral 15 is an image display means including an LCD or the like. Then, at the time of reproduction, the data on the optical disc 9 read by the optical head 10 (the reflected light from the optical disc irradiated with the laser light is used as the reflected light amount difference).
The data read by the photodetector 0) is the recording / reproducing means 8
After being temporarily stored in the memory 7 as reproduced recorded data, it is converted into original image data by the recording / reproducing signal processing means 6 and is displayed on the image display means 15 via the image signal processing means 5. .

Reference numeral 12 denotes a system control means composed of a control microcomputer for controlling the overall control of the apparatus. The system control means 12 controls the above-mentioned respective parts of the apparatus and controls the overall operation.

Next, a method of processing when normal recording or reproduction is not performed on the optical disk in this embodiment will be described with reference to the flow chart of FIG.

At step S1, in normal recording / reproduction,
If recording is stopped for some reason, step S2
At 7, the buffer memory remaining amount is measured from the recording data amount stored in the memory 7. Then step S3
In step 1, the retryable number of times A (normal time) is calculated from the buffer remaining amount, the image recording speed when converting the image or audio information into data, and the normal recording speed for recording on the disk medium. At this time, even if the number of retries is A or more, A is a number that can afford image data for a while (usually for a few seconds). In addition, here, when the value becomes A or more, the buffer remaining amount at that time and the number of times B (worst) that can be retried when the image recording speed is decreased are also obtained. In step S4, the seek operation is returned to the recording stop position, and in step S5, re-recording, so-called retry operation is performed. When the recording is completed in step S6, the recording data stored in the buffer memory is further recorded on the disc. If the recording is not completed in step S6, that is, the recording cannot be performed by the retry, if the number of retries in step S7 is A or less, the retry operation from steps S4 to S7 is repeated. If recording is not possible even if the number of retries exceeds A, it is judged in step S8 whether or not the recording speed of image recording should be changed. If not, the recording at the location ends with an error and step S11. Move on to the next record. When the image recording speed is changed, it is changed in step S9, and when the image recording speed is changed and recording cannot be performed up to the number of retries possible, the retries from step S4 to step S10 are repeated. If the recording is not possible even if the number of retries exceeds B, the recording at that location ends with an error, and the process proceeds to the recording next to step S11.

In FIG. 2, the retry is described as prescribing the number of retries at the same place, but the number of retries is not limited to this, and the number of retries occurring within a certain recording time,
That is, the retry may be performed at any place as long as it is within the recording time determined by the remaining amount of the buffer memory, and only the total number of times may be specified.

In the above description, the recording medium is a medium capable of overwriting and recording, but the recording medium is not limited to this, and a write-once recording medium capable of recording only once may be used. in this case,
Retry indicates an operation of re-recording from the vicinity of the recording stop position. Further, in the above description, the change such as changing the recording condition is not particularly performed at the time of retry, but the present invention is not limited to this, and the recording or reproducing condition may be changed for each retry.
In this case, the recording condition is changed by changing the recording power, the strategy, the focus, the correction of the track position, and the like.

[0022]

As described above, in the present invention, the transfer speed for recording or reproducing is compared with the transfer speed for recording or reproducing on the disk-shaped recording medium and the transfer speed for image data or audio data. If it is less than the threshold value, the retry operation can be performed, so that the same position can be recorded or reproduced more than once, so that the reliability of recording or reproduction can be improved. Further, by constantly monitoring the transfer speed of recording or reproduction, it is possible to prevent image distortion and sound skipping.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention and is a diagram showing a disk device system configuration.

FIG. 2 is a diagram showing a system flow of one embodiment of the present invention.

[Explanation of symbols]

1 ... Imaging means, 2 ... imaging optical system, 3 ... imaging device section, 4 ... A / D converter, 5 ... image signal processing means, 6 ... recording / reproducing signal processing means, 7 ... memory , 8 ... Recording / reproducing means, 9 ... Recording medium, 1
0 ... Optical head, 11 ... Servo, 12 ... System control means, 13 ... Display means, 14 ... Microphone, 15 ... Image display means

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G11B 7/004 G11B 7/004 C 20/10 301 20/10 301Z H04N 5/85 H04N 5/85 D ( 72) Inventor Tatsuya Ishihii, 292 Yoshida-cho, Totsuka-ku, Yokohama, Kanagawa Prefecture Digital Media Development Division, Hitachi Ltd. (72) Hideo Nishijima, 292 Yoshida-cho, Totsuka-ku, Yokohama, Kanagawa Hitachi, Ltd. Digital Media (72) Inventor Atsushi Oya 1410 Inada, Hitachinaka City, Ibaraki Prefecture F-Term (Reference) 5C052 AA02 BB03 EE10 5D044 BC03 BC04 BC05 CC06 DE03 DE12 DE17 DE23 DE29 DE39 EF03 EF06 FG10 GK10 5D090 AA01 BB02 BB03 BB04 CC01 CC04 DD03 HH01 HH03

Claims (3)

[Claims] 1. An image signal processing means for converting image or audio data into digital information at a certain speed and processing the signal.
Recording / reproducing signal processing means for converting the image or audio data generated by the image signal processing means into recording data for recording on a disk-shaped recording medium, a memory for temporarily storing the recording data, and the recording data for the recording data. A disk device provided with a recording / reproducing means for recording on a disk-shaped recording medium and a system control means for controlling the whole, and when recording of the previous period recorded data on the disk-shaped recording medium fails for some reason A disk device, wherein the number of times of returning to a position where recording on the disk-shaped recording medium has failed and trying a re-recording operation is variable. 2. The disk device according to claim 1, wherein
Return to the place where the recording of the disc-shaped recording medium failed,
Disk device characterized in that the number of times of re-recording operation is determined by the remaining amount of recording data stored in a memory for temporarily storing the recording data 3. The disk device according to claim 1, wherein
Return to the place where the recording of the disc-shaped recording medium failed,
A disk device, wherein the conversion speed for converting the image or audio data into digital information is changed when the number of re-recording operations exceeds a certain value.