JP2002093067A - Disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk device of high reliability without the occurrence of a problem such as the interruption of screens even continuous data like image data or speech data or the interruption of sounds. SOLUTION: In case a retry occurs on account of a failure in recording or reproducing, a transfer speed of recording or reproducing and the transfer speed of this image or speech data are compared and the retry is performed only when the transfer speed described above is sufficiently higher than the transfer speed of recording or reproducing to a disk. When the transfer speed of recording or reproducing falls below a certain threshold, the recording or reproducing is continued in spite of the error without making the retry.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk device using a disk-shaped recording medium such as an optical disk and a control method thereof, and more particularly to a disk device suitable for being mounted on a photographing device for recording moving images and sounds. And its control method.

[0002]

2. Description of the Related Art As a disk device for reproducing digital signals from a disk-shaped recording medium, for example, a C for reproducing digital audio data from a compact disk (CD) is known.
There is a D player. In this CD player,
By reading the difference in reflectance between pits and lands formed on the disc in advance using an optical head,
I am getting a playback signal.

[0003] In a disk player such as a CD player, which reproduces a signal by using optical means rather than a disk, operability such as random access is higher than that of a player using a tape-shaped recording medium. Since the recording medium is not in contact with the head, there is no deterioration of the recording medium and the reliability is very high.

However, in such a disk reproducing apparatus, the signal quality of a reproducing optical head that reads signals from the disk is degraded due to dust or defects on the disk, or electric noise or vibration, and the recorded data is not recorded. Cannot be read correctly and cannot be played back normally (for example,
The problem is that the sound is interrupted if it is a CD player). Such a problem also occurs in a rewritable disk device, that is, a disk recording device. In the disk recording device, dust or a defect on a disk, or electric noise, vibration, or the like causes
There is a problem that the recording signal from the recording optical head cannot normally reach the disk, and normal recording is not performed on the disk.

In order to solve these problems, conventionally, a so-called retry operation, in which a reproduction or recording operation is performed by scanning an unreproducible portion or a non-recordable portion again, is performed.

[0006]

The above-mentioned retry operation is an effective means for use in recording data on a disk as reliably as possible, for example, as in a data backup device. The transfer speed of the record 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, if a problem such as a screen cutoff or a sound cutoff occurs, a retry is performed. Is not valid.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, and to prevent a problem that a screen is cut off or a sound is cut off even in continuous data such as image data or audio data. Another object of the present invention is to provide a highly reliable disk device.

[0008]

In order to achieve the above object, according to the present invention, an image signal from an image pickup device is changed to image data, or an image signal for displaying the changed image data on a display means. And an encoding / decoding process, modulation / demodulation, addition of an ECC (Error Correction Code), or recording on a disc-shaped recording medium in order to convert the image data from the image signal processing unit into recording data. Signal processing means for converting to a recording format for recording, a memory for temporarily storing the recording data, and recording the recording data on a disk-shaped recording medium or reproducing the recorded data in the disk-shaped recording medium Recording or reproducing means for detecting a recording or reproducing position on the recording medium by means of an address signal or the like on the recording medium, Raw position detection means, recording and reproduction position control means for controlling the recording or reproduction position such as focus and tracking control of the optical head, disk rotation control, seek control for controlling the address position, etc., during the recording or reproduction When a recording or reproduction abnormality is detected, the recording or reproduction position control means again
Returning to the recording or reproducing position immediately before the recording or reproducing abnormality is detected, the recording or reproducing operation is attempted. If recording or reproduction cannot be performed even if the above operation is attempted once or several times, recording or reproduction at the position is abandoned, the recording or reproduction is moved to the next successive recording or reproduction position, and recording or reproduction is continuously performed. Further, even in a continuous recording or reproduction position, when a retry occurs without recording or reproduction due to dust or a defect on the disc, or electric noise, vibration, etc., the transfer speed of recording or reproduction is measured, and the image is recorded. Compared with the transfer rate required for audio data to prevent image distortion and sound skipping, retry is performed only when the transfer rate is sufficiently higher than the recording or reproducing transfer rate to the disk, and there is a recording or reproducing transfer rate. When the value becomes smaller than the threshold value, recording or reproduction is continued even if an error occurs without retrying.

Alternatively, the threshold value of the recording or reproducing transfer speed is made variable depending on the amount of recording data stored in a memory for temporarily storing recording data.

In the above method, a retry operation can be performed if the transfer speed of recording or reproduction is equal to or less than a certain threshold value by comparing the transfer speed of recording or reproduction on the disk with the transfer speed of image and audio data. Therefore, it is possible to increase the reliability of recording or reproduction. Also, by constantly monitoring the recording or reproduction speed, it is possible to prevent image disturbance and sound skipping.

[0011]

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 drive 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 (image pickup device) 3, an A / D converter 4, etc., and forms a subject image on the CCD 3 by the photographing optical system 2. An image signal is obtained by the CCD 3 and the A / D
The data is digitized by the converter 4 and output. Reference numeral 5 denotes an image signal processing means for converting an image signal from the photographing means 1 into image data. The image signal processing means 5 also processes an audio information signal from a microphone 14 which is an audio information signal input means. It has become. At the time of reproduction, the image signal processing means 5 converts the image data from the recording / reproduction signal processing means 6 into an image information signal for display output. The audio data from the recording / reproducing signal processing means 6 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 five image signal processing means, and the image quality and sound quality are determined by the processing capacity of the five image signal processing means. The transfer rate of data sent from the image signal processing means 5 to the recording / reproducing signal processing means 6 is determined.

Reference numeral 6 denotes a recording / reproducing signal processing means for converting image data (including audio data) from the image signal processing means 5 into recording data according to a recording format for recording on the disk-shaped recording medium 9. Alternatively, in order to convert the recording data reproduced from the disc-shaped recording medium 9 into image data (including audio data), processing such as encoding / decoding processing, modulation / demodulation processing, ECC addition / error correction processing, and the like are performed. . The transfer speed of recording or reproduction on the disk is determined by the processing capability of the recording / reproducing signal processing means 6, the processing capability of the recording / reproducing means 8, the rotational speed of the disk, and the like. Reference numeral 7 denotes a memory for temporarily storing image data (including audio data) from the image signal processing means 5. The memory is stored when the transfer speed of image data or 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, it is necessary to record on the disk-shaped recording medium 9 before the amount of storage in the memory does not exceed the memory capacity.

Reference numeral 8 denotes recording / reproducing means, 9 denotes a disk-shaped recording medium (optical disk) which is driven to rotate by a spindle motor (not shown), and 10 denotes a laser source (laser diode).
And 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 required for optical recording, for example, focus and tracking control for controlling an actuator (not shown) of the optical head 10, an SNP motor (not shown).
, A seek control for controlling an address position, and the like.

Reference numeral 15 denotes an image display means such as an LCD. At the time of reproduction, data on the optical disk 9 read by the optical head 10 (reflected light from the optical disk irradiated with laser light is used as a reflected light amount difference, and
0) is read by the recording / reproducing means 8
After that, the data is temporarily stored in the memory 7 as reproduced recording data, converted into original image data by the recording / reproducing signal processing means 6, and displayed on the image display means 15 via the image signal processing means 5. .

Reference numeral 12 denotes a system control means comprising a control microcomputer for controlling the whole apparatus. The system control means 12 controls each part of the above-mentioned apparatus and controls the whole apparatus.

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

(1) In step S1, the remaining amount of the buffer memory is measured from the amount of recording data stored in the memory 7. The image or audio data generated by the image signal processing means 5 has a different image or audio data amount depending on the image quality or sound quality, and the amount of data processed by the image signal processing means per unit time is determined by the transfer speed of the image or audio data. Call. As described above, the transfer speed of the image or audio data is variable depending on the image quality or sound quality. On the other hand, the recording data recorded on the disk is generated by the recording / reproducing signal processing means 6, and the speed at which the data is recorded on the disk is referred to as the recording data transfer speed. The memory 7 is means for temporarily storing image or audio data before recording it on a disk. Therefore, when the transfer speed of the recording data is lower than the transfer speed of the image or audio data, the difference in the transfer speed is accumulated in the memory 7, and
Up to the allowable capacity. However, if the image or audio data is transferred beyond the recording capacity, the data can no longer be recorded on the disk, and the image or audio data of that part is lost. The recording data is generated by the recording / reproducing signal processing means 6. When recording the recording data on a disk, the transfer speed of the recording data is determined by the rotation speed of the disk and the recording density on the disk. Therefore, normally the transfer speed is almost constant because the rotation speed is constant. However, if recording cannot be performed due to dust or defects on the disk, electric noise, vibration, etc., the recording is returned to the same place again and recorded again. Is performed, that is, when a so-called retry is performed, the recording transfer speed decreases. In this case, since the image or audio data continuously accumulates in the memory by the difference of the transfer speed, the loss of the image or audio data starts earlier. Therefore, measurement of the remaining amount of the memory 7 becomes important.

(2) In step S2, a threshold value for the transfer speed of the recording data is set based on the remaining buffer memory obtained in step S1. As for the transfer speed of the image or audio data, it is possible to secure an approximately constant transfer speed by setting image quality or sound quality conditions at the time of initial setting. Therefore, it is possible to set the allowable transfer speed of the recording data from the remaining buffer memory. For example, if the transfer speed of image or audio data is A (B / s) and the transfer speed of recording data is B (B / s), if A <B, even if there is no remaining buffer memory, image or audio data can be transferred. No omissions occur. However, when recording cannot be performed due to, for example, dust or a defect on the disk, or electrical noise or vibration, the recording is returned to the same place again, so-called retry, and if A> B, the buffer memory remaining If the amount is C (B), C / (AB)
Retry will be continued for seconds. In the case of dust or a defect on the disk, the size can be roughly estimated. Therefore, if it is desired to repeat the retry until the dust or the defect is exceeded, it is possible to know how many seconds the retry is required. Accordingly, it is possible to obtain the allowable transfer speed of the recording data from the calculated value.

(3) If recording or reproduction is disabled in step S3, the threshold is set in step S5 in step S4 only when the transfer rate of the recording data at that time is equal to or higher than the threshold set in step S2. Set the number of retries according to the value. If the transfer speed of the recording data is equal to or less than the threshold value in step S4, no retry is performed. Then, if there is still print data in step S10, the process returns to step S1 to continue the above-described system flow.

(4) In steps S6 to S9, retry of recording or reproduction is executed according to the number of retries.

(5) In step S10, if there is recording data to be continuously recorded or reproduced, the operation from step S1 to step S9 is continued.

Although the above describes the case of recording, the present invention is not limited to this, and the same sequence may be used for reproduction. 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 reproduction condition may be changed every retry.

[0025]

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

[Brief description of the drawings]

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

FIG. 2 is a diagram showing a system flow according to an embodiment of the present invention.

[Explanation of symbols]

1. Imaging means 2. Imaging optical system 3. Image sensor unit 4. A / D converter 5. Image signal processing means 6. Recording / reproduction signal processing means 7. Memory 8. Recording / reproduction means 9. Recording medium 10. Optical head 11. Servo 12. System control means 13. Display means 14. Microphone 15. Image display means

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) G11B 7/004 G11B 7/004 A (72) Inventor Jun Oya 1410 Inada, Hitachinaka-shi, Ibaraki Pref. Digital Media Hitachi, Ltd. Product Division (72) Inventor Kazunori Uemura 1410 Inada, Hitachinaka-shi, Ibaraki Prefecture Digital Media Products Division, Hitachi, Ltd. (72) Inventor Akishi Mikabe 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Pref. F-term in Hitachi Digital Media Development Division (reference) 5D090 AA01 CC01 CC04 DD03 FF30 FF38 HH01

Claims (3)

[Claims] 1. An image signal processing means for converting an image or sound into digital information and performing signal processing, and recording data for recording the image or sound data generated by the image signal processing means on a disk-shaped recording medium. Or a recording / reproducing signal processing means for converting recording data reproduced from the disk-shaped recording medium into image or audio data; a memory for temporarily storing the recording data; A recording / reproducing means for recording data on or reproducing recorded data from the disk-shaped recording medium; and a system control means for controlling the entire system. Alternatively, if the reproduction fails, the disc is rewritten within a predetermined time immediately before the recording or the reproduction fails. If the average recording transfer rate or the reproduction transfer rate when recording or reproducing on the recording medium is equal to or higher than a desired transfer rate, the recording or reproduction is returned to the place where the recording or reproduction failed and the recording or reproduction operation is performed at least once. A disk device characterized by being tried. 2. The disk device according to claim 1, wherein
Returning to the place where the recording or reproduction failed, the threshold value of the average recording transfer rate or the reproduction transfer rate that permits performing the recording or reproduction operation at least once is set to temporarily reduce the recording data. A disk device, which is determined based on a remaining amount of recording data stored in a storage memory. 3. The disk drive according to claim 1, wherein
Returning to the place where the recording or reproduction has failed, the average recording transfer speed or reproduction transfer speed that permits performing the recording or reproduction operation at least once is as follows:
A disk device, wherein a transfer speed is higher than a transfer speed when the image signal processing means continuously generates the image or audio data.