JPH11328674A - Disc reproducer and reproducing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disc reproducer in which vibrationproof performance is enhanced by ensuring continuous reproducing motion even when retry is not performed at a detective sector and the residual volume of data in a memory means is low, or when an optical pickup moved to an undesired track on a disc medium due to vibration. SOLUTION: When an error signal 109 is delivered from an error detecting means 9, a microprocessor 10 registers that sector as a defective sector in a detective sector registering section 21. If a detective sector is generated at a close position even after an optical pickup 2 turned round a track one or a plurality of times, a detect predicting section 22 predicts that the probability of defective sector is high and the prediction is registered at a defect prediction registering section 23. A sector control processing section 20 performs defect processing based on the registered content.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reproducing apparatus using a disk-shaped recording medium such as an optical disk and a disk reproducing method used therefor.

[0002]

2. Description of the Related Art Conventionally, when a defective sector occurs in a disk track, a retry process is simply performed.
Therefore, when there are many defective sectors such as a scratched disk, the number of retry processes increases, the remaining amount of data in the memory means decreases, and the probability of discontinuous data transfer increases.

FIG. 3 shows a conventional disk reproducing apparatus. The reproduction means 3 for reproducing the output 101 of the optical pickup 2 at a transfer speed higher than the predetermined transfer speed of the reproduction output data, and the reproduction data 102 obtained by the reproduction means 3 are written intermittently. Memory means 4 which is continuously read out as reproduction output data 103 of the predetermined transfer speed which is slower, write address generation means 5 which generates a write address 104 of memory means 4 according to a given reproduction command, and read address of memory means 4 Read address generating means 6 for generating the data 105
A reproduction output means 7 for outputting the reproduction output data 103 continuously read from the memory means 4 to the outside as a reproduction output signal 106; and a tracking for making the optical pickup 2 on-track on a track and accessing a desired track. The control unit 8 detects an error from the reproduction data 102 obtained by the reproduction unit 3, and outputs an error detection signal 109 for each sector. The error detection unit 9 detects a difference between the write address 104 and the read address 105. A microprocessor 10 for outputting a reproduction command when the difference is equal to or smaller than a predetermined comparison value;
Is provided with a defect processing unit 11, and the microprocessor 1
If the error detection signal 109 is output from the error detection means 9, the sector is retried by the defect processing section 11 until the memory means 4 becomes empty or near empty.

In recent years, a defective sector is stored and a retry process is not performed when reproducing the second and subsequent times (Japanese Patent Laid-Open No. 8-77729), or a servo gain is changed when retrying. By doing so, the retry processing is reduced, and the probability of occurrence of discontinuous data transfer is reduced.

[0005]

However, in the above-described conventional configuration, when a defective sector occurs, the retry process is simply performed. When there are many defective sectors such as a scratched disk, the retry process increases. There is a problem in that the remaining amount of data in the memory means is reduced, and sound interruption occurs.

Further, when a defective sector is stored and reproduced again for the second and subsequent times, even if retry processing is not performed,
If the same location is not played two or more times on the same disc, retry processing is performed.

The present invention solves the above-mentioned conventional problems, and predicts a defect even in the first disc reproduction, reduces unnecessary retry processing, and reduces the probability of sound interruption. Further, in the case of retry, a disk reproducing device and a disk reproducing method capable of performing a gain change without performing a retry by estimating a defect without performing a retry such as changing a servo gain. With the goal.

[0008]

The disk reproducing apparatus and the disk reproducing method of the present invention take advantage of the fact that a scratch on a disk has a high possibility of generating a linear scratch on a scratched disk. That is, the next defect is expected.

That is, when the scratches 40 are present on the disk medium 1 shown in FIG. 4, since the scratches are continuously generated across the tracks in view of the fine track width 41, the scratches are generated again after one round of the track. You are doing.

[0010] By utilizing this characteristic, defects can be predicted.
Unnecessary retry processing can be reduced, and the probability of sound interruption can be reduced. Therefore, the present invention provides a microprocessor that outputs a reproduction command of reproduction data to a track 1.
A defect registration unit for registering a defect for one circumference; a defect prediction calculation unit for determining a defect prediction that a predetermined recording unit after one round of the next track is a defect when a defect occurs after one round of the track; A defect prediction registration unit for registering a result of the defect prediction calculation unit is configured. When an error detection signal is output from the error detection unit, the predetermined recording unit is registered as a defect in the defect registration unit, and the optical pickup is rotated around one track. If a defect occurs later, it is expected that the defect is likely to be high after one round of the next track, and the error protection processing is immediately performed again without performing the reproduction retry processing to continue the reproduction operation.

According to the present invention, reproduction retry processing for a defect is reduced, and interruption occurs even when the optical pickup moves to an undesired track on the disk medium due to a small amount of data remaining in the memory means or due to vibration or the like. It enables continuous re-operation and improves earthquake resistance.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A disk reproducing apparatus according to a first aspect of the present invention is a disk reproducing apparatus for reproducing a digital signal recorded on a track of a disk-shaped recording medium in a predetermined recording unit by using an optical pickup. A reproducing means for reproducing the output of the optical pickup at a transfer speed higher than a predetermined transfer speed of the reproduction output data; and a reproduction means for intermittently writing reproduction data obtained from the reproduction means, the reproduction data being obtained from the reproduction data. Memory means which is continuously read as transfer speed reproduction output data, write address generation means which generates a write address of the memory means according to a given reproduction command, and read address generation means which generates a read address of the memory means And reproducing output data continuously read from the memory means as a reproducing output signal. And a reproduction output means for outputting to an external Te,
Tracking control means for causing the optical pickup to be on-track on the track and accessing a desired track; and error detection means for detecting an error from reproduction data obtained by the reproduction means and outputting an error detection signal for each sector. And a microprocessor for detecting a difference between the write address and the read address and outputting the reproduction command when the difference becomes equal to or smaller than a predetermined comparison value, wherein the microprocessor internally includes the error detection means and the read address generation. Means for determining a defective portion from the means and controlling the tracking control means. When an error detection signal is output from the error detection means, the defect management means registers the predetermined recording unit as a defect and If a defect occurs even after the lap, a predetermined value after one lap of the next track Recording unit is determined to be a defect,
Defect processing is performed after one round of the next track.

According to a second aspect of the present invention, there is provided the disk reproducing apparatus according to the first aspect, wherein the defect management unit registers a defect for one round of the track, A defect prediction calculation unit for calculating the defect prediction, and a defect prediction registration unit for storing the result of the defect prediction calculation unit.

According to a third aspect of the present invention, in the disk reproducing apparatus according to the first aspect, a plurality of defect registration units for registering defects for a plurality of tracks, and a plurality of tracks before and after the next track around the plurality of tracks as the defect management means. And a plurality of defect prediction calculation units for determining that the sector after one round of the next track is defective when the defect is found.

According to a fourth aspect of the present invention, there is provided a disk reproducing method comprising: an error detecting process for detecting an error detection signal for each predetermined recording unit from reproduced data; and a predetermined recording unit when an error is recognized by the error detecting process. Registration processing for registering a defect as a defect, and defect prediction calculation processing for predicting a defect that a predetermined recording unit after one round of the next track is a defect when a defect occurs after one or more rounds of the track And a defect prediction registration process for registering a predicted defect if the defect prediction calculation process predicts a defect, and a normal process by determining a scratch disk if a current predetermined recording unit is registered by the defect prediction registration process. And performing a retry process by determining that the vibration has occurred if not registered.

Hereinafter, a disk reproducing method according to the present invention will be described based on specific embodiments. FIG. 1 shows a disk reproducing apparatus according to the first embodiment of the present invention. In FIG. 1, 1 is a disk medium, 2 is an optical pickup, 3 is a reproducing means, 4 is a memory means, 5 is a write address generating means, 6 is an address generating means, 7 is a reproducing output means, 8 is a tracking control means, 9 Is an error detecting means, 10 is a microprocessor, 20 is a sector control processing section, 21 is a defective sector registration section, 22 is a defect prediction calculation section, and 23 is a defect prediction registration section.

In the disk reproducing apparatus thus configured, first, the optical pickup 2 is connected to the tracking control means 8.
On the track and access to the desired track. The reproduction means 3 reproduces the output 101 of the optical pickup 2 at a transfer speed higher than a predetermined transfer speed of the reproduction output data 103.

The reproduced data 102 obtained by the reproducing means 3
Is intermittently written into the memory means 4 and is continuously read out from the memory means 4 as reproduction output data 103 having a predetermined transfer speed lower than the written reproduction data 102.

The write address 104 of the memory means 4 is converted into the write address
Are generated, and the read address 105 of the memory unit 4 is generated by the read address generation unit 6.

The microprocessor 10 detects a difference between the write address 104 and the read address 105, and outputs a reproduction command when the difference becomes equal to or smaller than a predetermined comparison value. When a reproduction command is issued, the reproduction output means 7 outputs the reproduction output data 103 continuously read from the memory means 4 as a reproduction output signal 106 to the outside.

This series of operations is repeated. If there is a defective sector on the disk, an error is detected from the reproduced data 102 obtained by the reproducing means 3 and an error detection signal 109 is sent to the error detecting means 9 for each sector. Output.

The microprocessor 10 registers a defect position in a defect registration unit 21 for registering defective sectors for two tracks. After one round of the track, the defect prediction calculation unit 22 recognizes from the defect registration unit 21 whether or not there is a defective sector at substantially the same position. Register in the registration unit 23. The sector control processing unit 20 performs defect processing based on the registered contents.

As described above, the defective sector registering unit 21 for registering a defective sector for one round of a track inside the microprocessor 10 for outputting a reproduction command of reproduced data, and a case where a defective sector occurs after one round of the track. Next track 1
By providing a defect prediction calculation unit 22 for determining a defect prediction that the sector after the defect is a defective sector and a defect prediction registration unit 23 for registering the result of the defect prediction calculation unit 22 as a disk reproducing device, The next defective sector can be predicted in terms of the circuit, unnecessary retry processing can be reduced, and the probability of occurrence of sound interruption can be reduced.

Note that instead of the defective sector registration section 21 and the defect prediction calculation section 22, a plurality of defective sector registration sections for registering defective sectors for a plurality of tracks, and a plurality of defective sectors before and after the next track around a plurality of tracks. In such a case, a configuration may be adopted in which a plurality of defect prediction calculation units that determine that the sector one round after the next track is a defective sector are provided.

FIG. 2 shows a specific processing procedure of the defective sector registration unit 21, the defect prediction calculation unit 22, and the defect prediction registration unit 23 in the microprocessor shown in FIG. In FIG. 2, 31 is an error determination process, 32 is a defective sector registration process, 33 is a defect prediction calculation process 34 is a defect prediction registration process, 35 is a process for determining whether the current sector is registered as a defect, 36 is a normal process, 37 is a retry process.

First, if an error is recognized by an error determination process 31 for detecting an error detection signal for each sector from the reproduced data, the sector is registered as a defective sector by a defective sector registration process 32 when the error is recognized. If a defective sector occurs after one or more tracks, the next track 1
Defect prediction calculation processing 3 that the sector after the circumference is a defective sector
3 predicts a defect, and registers a predicted defect in a defect prediction registration process 3
4 In a process 35 for determining whether or not the current sector is registered as a defect predictive register, if it is registered, it is determined to be flawed, and normal processing 36 is performed.

As described above, according to this embodiment, the error determination processing, the defective sector registration processing, the defect prediction calculation processing, the defect prediction registration processing, and the processing for determining whether or not the current sector is registered as a defect are defined as the disk reproducing method. With this arrangement, it is possible to predict the next defective sector in the optical disk reproduction without any additional device, to reduce unnecessary retry processing, and to reduce the probability of sound interruption.

[0028]

As described above, according to the disk reproducing method of the present invention, an error detecting process for detecting an error detecting signal for each predetermined recording unit from the reproduced data, and the error detecting process when the error detecting process recognizes an error. A defect registration process for registering a defect with a recording unit as a defect, and a defect prediction for predicting a defect that a predetermined recording unit after the next round of the track is defective if a defect occurs after one or more rounds of the track. The calculation process, a defect prediction registration process for registering a predicted defect if the defect prediction calculation process predicts a defect, and a normal process of determining a scratch disk if the current sector has been registered by the defect prediction registration process, and If it is not registered, it is determined that the vibration is present and the retry process is performed, so that the next defect can be predicted, and unnecessary retry process can be reduced. It can provide an excellent disk reproducing apparatus capable of reducing the probability of cutting.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a disc reproducing apparatus according to Embodiment 1 of the present invention.

FIG. 2 is a diagram of an algorithm of a disc reproducing method according to a second embodiment of the present invention.

FIG. 3 is a diagram of a circuit configuration of a conventional disk reproducing method.

FIG. 4 is a plan view of a scratched disk.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disc medium 2 Optical pickup 3 Reproduction means 4 Memory means 5 Write address generation means 6 Address generation means 7 Reproduction output means 8 Tracking control means 9 Error detection means 10 Microprocessor 20 Sector control processing part 21 Defective sector registration part [Defect registration part 22 Defect Prediction Calculation Unit 23 Defect Prediction Registration Unit 31 Error Determination Processing 32 Defect Sector Registration Processing [Defect Registration Processing] 33 Defect Prediction Calculation Processing 34 Defect Prediction Registration Processing 35 Determination Processing Whether the Current Sector Is Registered as Defect 36 Normal Processing 37 Retry processing

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI G11B 20/18 552 G11B 20/18 552A 572 572C 572F

Claims (4)

[Claims] 1. A disk reproducing apparatus for reproducing a digital signal recorded on a track of a disk-shaped recording medium in a predetermined recording unit by using an optical pickup, wherein the output of the optical pickup is changed to a predetermined transfer rate of reproduced output data. A reproducing means for reproducing at a higher transfer speed, and a memory means for continuously reproducing read data obtained from the reproducing means as reproduced output data at the predetermined transfer speed lower than the reproduced data intermittently written. A write address generating means for generating a write address of the memory means in accordance with a given reproduction instruction; a read address generating means for generating a read address of the memory means; and reproducing reproduced output data continuously read from the memory means. Reproduction output means for outputting to the outside as an output signal; Tracking control means for causing a track to be on-track on the track and accessing a desired track; and error detection for detecting an error from reproduction data obtained by the reproduction means and outputting an error detection signal for each of the predetermined recording units. Means for detecting a difference between the write address and the read address, and outputting the reproduction command when the difference is equal to or smaller than a predetermined comparison value, wherein the microprocessor includes the error detection means and the read address generation. Means for determining a defective portion from the means and controlling the tracking control means. When an error detection signal is output from the error detection means, the defect management means registers the predetermined recording unit as a defect and performs one round of the track. If a defective sector still occurs after that, a predetermined recording unit A disk reproducing apparatus that determines that the position is defective and performs defect processing after one round of the next track. A defect registration unit for registering a defective sector for one round of the track as a defect management means; a defect prediction calculation unit for calculating a defect prediction after one round of the track from the defect registration unit; 2. The disk reproducing apparatus according to claim 1, further comprising: a defect prediction registration unit that stores a result of the unit. 3. A plurality of defect registration units for registering defects for a plurality of tracks, as a defect management means, and a predetermined recording unit after one round of the next track when there is a defect around the next track over a plurality of tracks. 2. The disk reproducing apparatus according to claim 1, further comprising: a plurality of defect prediction calculation units that determine that the is a defect. 4. An error detection process for detecting an error detection signal for each predetermined recording unit from the reproduction data; a defect registration process for registering a defect using the predetermined recording unit as a defect if an error is recognized by the error detection process; If a defect occurs after one or more laps of a track, a defect prediction calculation process of predicting a defect that a predetermined recording unit after the next track of the track is a defect, and the defect prediction calculation process predicts a defect. If the current sector has been registered by the defect prediction registration process, the defect is determined to be a scratch disk, and normal processing is performed. If the current sector has not been registered, vibration is determined and retry processing is performed. A disc reproducing method having a determination process.