JP2002367277A - Optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk device of a short access time by decreasing the useless retries before a reproducing speed is switched to the speed at which stable reproduction is possible when an error occurs during the high-speed reproduction due to the flaws, fingerprints, etc., on a disk. SOLUTION: The recording surface of the disk is divided to plural zones and the optimum reproducing speeds are stored in a table by each of the respective zones during reproduction. When the same zones are reproduced thereafter, the reproduction is performed by instantaneously switching the reproducing speed to the optimum reproducing speed read out of the table.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk device represented by a CD-ROM drive,
In particular, the present invention relates to an optical disk device having means for switching to a reproduction speed at which more stable reproduction can be performed when errors occur during reproduction.

[0002]

2. Description of the Related Art In recent years, the standard mounting of an optical disk device on a personal computer has rapidly progressed, and it has become an indispensable function of a personal computer along with a hard disk drive.
Initially, CD-ROM drives occupied the majority of optical disk devices, but recently, DVD-ROM drives with higher capacities than CD-ROM drives, and CD-R / CD-RWs that can be written or rewritten have been developed. With the drive being standardized in personal computers and the introduction of DVD-R and DVD-RAM drives on the market, the performance and functionality of optical disc drives are not limited.

FIG. 11 shows an example of a configuration diagram of this optical disk device. The rotation of the optical disk 1 is controlled by a spindle motor 2 at a constant linear velocity (CLV) or a constant angular velocity (CAV). A pickup 3 irradiates the rotating optical disk 1 with laser light on the disk surface while moving in a radial direction from the inner peripheral side to the outer peripheral side of the disk, and changes the data on the disk surface based on a change in the reflected light. Read.

[0004] Data called pits are spirally recorded on the disk surface, and the pickup 3 is driven and controlled in the horizontal direction by a traverse motor 5 so that the data can be accurately read. In addition, pickup 3
Is also driven and controlled in the vertical and horizontal directions. The drive of the spindle motor 2, the traverse motor 5, and the lens 4 is controlled via a driver IC 6. The signal read from the pickup 3 is sent to an analog front-end IC 7, amplified and shaped, and then sent to a digital signal processor IC 8.

[0005] The digital signal processor IC 8 converts the signals sent from the analog front-end IC 7 into a spindle motor 2, a traverse motor 5, and a lens 4.
Is generated and supplied to the driver IC 6. Further, separately from the servo signals, the digital signal processor IC8 sends a signal including data to the decoder IC9.

[0006] The decoder IC 9 demodulates the data signal input from the digital signal processor 8, performs error correction processing, and transfers the generated data to the buffer memory 1.
Write to 0. Finally, the decoder IC 9 stores the data written in the buffer memory 10 into the host computer 1.
Transfer to 4. The CPU 11 controls the operation of each of the driver IC 6, the analog front-end IC 7, the digital signal processor IC 8, and the decoder IC 9.

In recent years, the reproduction speed of the optical disk device has been remarkably increased. At present, an optical disk device capable of reproducing a CD-ROM at a speed of 40 times or more has been developed. However, in high-speed reproduction, the performance margin of the optical disk device is reduced, so that an optical disk having a defect such as a scratch or a fingerprint frequently generates errors during reproduction, and sometimes high-speed reproduction is difficult. Accordingly, an optical disk device having a function of switching to a reproduction speed at which more stable reproduction can be performed when errors occur during reproduction frequently has been developed. Hereinafter, the conventional optical disk device will be described.

FIG. 12 is a flowchart showing a procedure of operation control executed by the CPU 11 at the time of reproduction in the conventional optical disk device. In step S31, a read command is received from the host computer 14. In step S32, it is checked whether or not the current reproduction speed is a predetermined reproduction speed normally used for the format of the optical disc 1 to be reproduced. If the reproduction speed is not the predetermined reproduction speed, the process proceeds to step S33, and the process proceeds to step S33. Switch to playback speed.

In step S34, a seek operation is performed to move the pickup to a target address to be reproduced. In step S35, the data read from the optical disc by the decoder IC 9 is subjected to demodulation and error correction processing, and writing to the buffer memory 10 is started. In step S36, the decoder IC 9 completes writing the data unit called one sector into the buffer memory 10.

In the next step S37, in step S31
It is checked whether or not the elapsed time after receiving the read command from the host computer 14 exceeds a predetermined timeout value. This timeout value is generally set to a time shorter than the time limit (command timeout) from when the optical disk device receives the read command to when the command execution result is transmitted to the host computer 14. If the elapsed time from the reception of the read command exceeds a predetermined timeout value, the reproduction process ends. If the elapsed time has not reached the predetermined timeout value, the process proceeds to step S38.

In step S38, the CPU 11
The error signal output from the decoder IC 9 when a read error occurs is monitored, and it is confirmed whether or not it is necessary to retry the reproduction process for the sector currently being reproduced.
If it is determined that a read error has occurred, the process proceeds to step S39 to perform a retry process on the sector in which the read error has occurred.

If it is determined in step S38 that a read error has occurred, first, in step S39.
, A counter x for counting the number of retries (hereinafter, retry counter x) is incremented. Subsequently, in step S40, it is determined whether the retry counter x has reached a predetermined retry count limit a. When it is determined that the retry counter x has reached the predetermined retry count limit a, in the next step S41,
It is determined that reproduction is difficult at the current reproduction speed, and the reproduction speed is switched to a reproduction speed which is considered to be more stable.
Here, the switching speed is generally a playback speed that is one stage lower than the current playback speed among the playback speeds that can be set by the optical disc device. After the speed switching is completed, the retry counter x is cleared in step S33. The retry is performed with the erroneous sector as a new target address. At this point, since the pickup 3 has passed the erroneous sector, the retry is performed again from the seek operation in step S34.

On the other hand, in step S40, if the retry counter x has not reached the predetermined retry count limit a, that is, if x <a, the current reproduction speed is maintained.
Retry is performed from the seek operation in step S34. If it is determined in step S38 that no read error has occurred, it is determined that the current sector has been reproduced without error, and the process proceeds to step S43.

In step S43, all the sectors requested by the host computer 14 are stored in the buffer memory 1.
It is determined whether the value has been stored in 0. If the result of the determination is that the number of sectors requested by the host computer 14 has not yet been stored in the buffer memory 10, the reproduction process by the decoder 9 is continued as it is, and the process returns to step S36 to evaluate the next sector. If it is determined that the number of sectors requested by the host computer 14 is stored in the buffer memory 10, the process proceeds to the next step S44, where the decoder IC 9 performs data transfer to the host computer 14, The reproduction operation ends.

FIG. 13 is a diagram showing an example of how the reproduction speed changes in a conventional optical disk device, showing the relationship between addresses on the disk and the reproduction speed. The horizontal axis is the address on the disk, and the vertical axis is the reproduction speed. In the figure, V
1, V2 and V3 indicate reproduction speeds that can be set by the optical disk device. Generally, there are two types of reproduction speed of the optical disk, namely, a constant linear velocity (CLV) and a constant angular velocity (CAV). Here, either of them may be used. Here, V1 is the maximum speed that can be set by the optical disk device for reproducing the optical disk to be reproduced. This V1 is usually used by the optical disk apparatus to reproduce the optical disk to be reproduced, unless a different reproduction speed is specified by the host computer 14 or a case where read errors occur frequently and decelerate. The playback speed.
V2 is a reproduction speed decelerated by one step from V1,
Reproduction can be performed more stably than V1. Similarly, V3 is a reproduction speed decelerated by one step from V2, and can be reproduced more stably than V2.

That is, in the figure, stable reproduction is performed at the reproduction speed V1 from the innermost circumference of the disk to the address A1. At address A1, the read speed has been reduced to V2 because the read error has occurred frequently and the number of retries has exceeded the limit. Similarly, from A1 to A2, the reproduction is stably performed at the reproduction speed V2. Since the read error frequently occurs at the address A2 and the number of retries is exceeded, the reproduction speed is reduced to the reproduction speed V3. From the address A2 to the address A3, stable reproduction is performed at the reproduction speed V3. At address A3, the playback speed has returned to V1, but this is due to the fact that if the data could be reproduced continuously without error for a predetermined time, or if a predetermined amount of data could be reproduced continuously without error, It is determined that the data has been judged to have passed through a defective portion such as a fingerprint or a fingerprint, or that the reproduction speed has been designated by the host computer 14. From the address A3 to the outermost periphery of the disc, the reproduction is stably performed at the reproduction speed V1.

As described above, when read errors frequently occur during high-speed reproduction, the reproduction speed is switched stepwise every time the number of retries reaches the number of retries.
A stable reproduction operation becomes possible.

[0018]

In the above-mentioned optical disk apparatus, at address A1 and address A2 in FIG. 13, in order to reduce the reproduction speed by one step so that more stable reproduction can be performed, it is necessary to execute step S40. The condition x ≧ a must be satisfied. Since one retry operation always includes the seek operation in step S34, at least a seek operation is performed at least for convenience before deceleration, and the access time is delayed.

Furthermore, even if the defect on the disc can be reproduced at the initial reproduction speed at a reproduction speed reduced by one step from the highest speed, the reproduction speed is thereafter determined by a command from the host computer or the judgment of the optical disk device itself. If the speed is set to a higher speed, an error frequently occurs even when an address near the same defect is reproduced again. Therefore, the speed is decelerated at step S41 in FIG. Since the seek operation is performed at least a times, the access time is delayed.

The present invention has been made in order to solve the above-mentioned problem, and an optical disc apparatus capable of improving an access time without performing useless retries until switching to a reproduction speed capable of performing stable reproduction. The purpose is to provide.

[0021]

In order to solve the above-mentioned problems, an optical disk apparatus according to a first aspect of the present invention comprises: a reproducing unit for reproducing data from a recording surface of an optical disk; and a recording surface of the optical disk. Memory means for storing a table for storing a playback speed corresponding to each of a plurality of zones obtained by dividing the above-mentioned zone, and repeatedly performing initial playback at a constant speed on the recording surface of the optical disc to perform stable playback. Is stored in the table as the optimum reproduction speed for each zone when the reproduction is completed, and reproduction is performed on the recording surface of the optical disc at the optimum reproduction speed for each zone read from the table. Things. Thus, after the table is stored by the memory means, the reproduction can be performed at the optimum reproduction speed without repeatedly performing retries, so that the access time can be improved.

According to a second aspect of the present invention, there is provided an optical disk device according to the first aspect, wherein
The optimal playback speed is determined when the initial playback can be continuously performed without an error for a predetermined time or when a predetermined amount of data can be continuously reproduced without an error.
A higher playback speed is set. Thus, when it can be determined that a defect such as a scratch or a fingerprint on the disk has passed, reproduction is performed by switching to a higher reproduction speed, so that a decrease in reading speed can be minimized.

According to a third aspect of the present invention, in the optical disk device according to the first or second aspect, a table storing the optimum reproduction speed by the initial reproduction is stored together with a disk code of the optical disk. When the disc code of the optical disc to be reproduced matches the disc code stored by the non-volatile memory means,
Using the table stored together with the disc code, reproduction is performed at the optimum reproduction speed. As a result, even when a plurality of optical discs are exchanged for playback, if an optical disc has been played back in the past, it is not necessary to create a new table of the optimum playback speed every time, and the optimum playback learned during the previous playback is not necessary. By reproducing at the speed, the access time can be improved.

According to a fourth aspect of the present invention, there is provided an optical disk apparatus according to the first aspect, wherein
A discriminating means for discriminating the format of the reproduced information from the optical disc to be reproduced; provided that the discrimination result by the discriminating means is a predetermined format, data of the predetermined format continuously exists; The optimum playback speed stored in the table at the time of the initial playback is corrected so that the speed switching operation does not occur in the area. Thus, stable reproduction can be performed by suppressing the occurrence of the read retry operation or the speed switching operation during reproduction of the predetermined format.

According to a fifth aspect of the present invention, in the optical disk device of the fourth aspect, the predetermined format is a format in which chronological continuity of data transfer to the host computer is important. It is something that was taken. As a result, particularly during the reproduction of data such as audio and video that requires real-time performance, it is possible to suppress the occurrence of read retry operation and speed switching operation, and to perform stable reproduction that does not easily cause abnormal reproduction such as skipping of audio. Can be.

An optical disk device according to a sixth aspect of the present invention is the optical disk device according to the fourth aspect,
A nonvolatile memory means for storing a table storing the corrected optimal reproduction speed together with a disk code of the optical disk, wherein the disk code of the optical disk to be reproduced and the disk code stored by the nonvolatile memory means If they match, playback is performed at the optimum playback speed in the predetermined format using the table stored together with the disc code. Thus, in the predetermined format, an optical disc that has been reproduced in the past can be reproduced at the optimum reproduction speed learned during the previous reproduction.
It is possible to perform stable reproduction in a predetermined format and improve access time.

According to a seventh aspect of the present invention, in the optical disk device according to any one of the first to sixth aspects, means for acquiring disk information recorded in a specific area of the optical disk is provided. The format of the recording data is determined based on the obtained disk information and the initial value of the table is determined based on a predetermined optimum reproduction speed corresponding to the format. Accordingly, by setting an appropriate playback speed in advance according to the use of the recorded data, stable playback in the first playback can be performed, and the access time can be improved.

An optical disk device according to an eighth aspect of the present invention is the optical disk device according to the seventh aspect,
The predetermined optimum reproduction speed corresponding to the format is a reproduction speed corresponding to the error correction capability of the format. Thereby, particularly in the case of reproducing data in a format having a low error correction capability, the occurrence of a read retry operation or a speed switching operation is suppressed in advance, so that stable reproduction in the first reproduction can be performed and access can be performed. Time can be improved.

An optical disk device according to a ninth aspect of the present invention is the optical disk device according to the seventh aspect,
The predetermined optimal reproduction speed corresponding to the format is such that when the result of the format discrimination is a format in which the time series continuity of data transfer to the host computer is important, the time series continuity of the data transfer is guaranteed. Playback speed. This allows
In particular, when reproducing data such as audio and video, the occurrence of a read retry operation or a speed switching operation is suppressed in advance, so that stable reproduction can be performed in the first reproduction and the access time can be improved. Can be.

According to a tenth aspect of the present invention, in the optical disk device according to the first aspect, only a predetermined portion of each zone is reproduced at a predetermined reproduction speed. And an error counting means for counting errors generated during reproduction. The initial value of the table is determined based on a predetermined optimum reproduction speed according to the number of errors counted by the two means. Is what you do. Thus, by starting playback at a playback speed that takes into account the influence of defects such as scratches and fingerprints on the disc in advance, it is possible to perform stable playback in the first playback and improve access time. .

According to an eleventh aspect of the present invention, in the optical disk device of the tenth aspect, the predetermined portion of each zone is a predetermined number of sectors from a head address of each zone. It was something. As a result, the number of errors in a predetermined number of sectors in each zone is counted, and the effect of defects such as scratches and fingerprints on the disk is started at a playback speed that takes into account the influence of defects, thereby stabilizing the first playback. Playback can be performed, and the access time can be improved.

According to a twelfth aspect of the present invention, in the optical disk device of the tenth aspect, the predetermined reproduction speed is a maximum speed that can be set for reproducing an optical disk to be reproduced. It is assumed that it is. This makes it possible to start playback at an appropriate playback speed that reflects the effects of scratches on the disk, fingerprints, etc., especially for data with a format that has a high error correction capability. Playback can be performed, and the access time can be improved.

[0033]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a diagram showing a configuration of the optical disk device according to the first embodiment.
Note that the same reference numerals as those in FIG. 11 have the same configuration as that described in the above-described conventional technique, and a description thereof will be omitted.

In the figure, the configuration of the optical disk device is such that a table storage memory 12 and a nonvolatile memory 13 are added to the configuration of the conventional optical disk device shown in FIG. The table storage memory 12 is a memory for storing a table storing the optimum reproduction speed obtained by the initial reproduction, and the non-volatile memory 13 reproduces the table storing the above-described optimum reproduction speed. This is a memory for storing as a reproduction history together with the disk code of the optical disk.

Next, referring to FIGS. 3 and 4, the table storage memory 1 in the optical disk device of the first embodiment will be described.
2 (hereinafter, referred to as an optimum reproduction speed table or simply a table) will be described. FIG.
5 shows an example of the relationship between the address on the disk and the playback speed in the optical disk device according to the first embodiment. FIG.
Explanations for the same reference numerals as in FIG. 13 are the same as those in FIG. In FIG. 3, the address space on the horizontal axis is divided into n zones from Z1 to Zn.

In the figure, all the zones Z1 can be reproduced at the reproduction speed V1. That is, the optimum reproduction speed of the zone Z1 is V1. In the zone Z2, the reproduction was performed at the reproduction speed V1 up to the address A1 in the middle. However, at the reproduction speed V1, at the address A1, read errors occurred frequently, and the reproduction speed was reduced to the reproduction speed V2. I have. That is, the optimum reproduction speed of the zone Z2 is V
It becomes 2. Similarly, in the zone Z3, the reproduction speed is reduced from the reproduction speed V2 to the reproduction speed V3 at the address A2 in the middle, but since the stable reproduction is performed thereafter, the optimum reproduction speed for the zone Z3 is V3. Similarly, the optimum reproduction speed for the zone Z4 is V3, and the optimum reproduction speeds for the zones Z5 to Zn are all V3.
It becomes 1.

FIG. 4 is an example of the optimum reproduction speed table in the optical disk device according to the first embodiment. FIG. 4 is a table in which the optimum reproduction speed for each zone in FIG. 3 is stored in a table. FIG. 2 is a flowchart showing a procedure of an operation control executed by the CPU 11 at the time of reproduction in the optical disc device of the first embodiment.

In step S1, a read command is received from the host computer 14. In step S2, referring to the table, the optimum reproduction speed corresponding to the zone including the target address to be reproduced is acquired, and in the next step S3, it is determined whether or not the current reproduction speed is the above-mentioned optimum reproduction speed. If the current playback speed is the optimum playback speed in step S3, the process proceeds directly to step S5. If the current playback speed is not the optimum playback speed in step S3, the process proceeds to step S4, where the playback speed is switched to the optimum playback speed, and then the process proceeds to step S5.

In step S5, a seek operation is performed to move the pickup 3 to a target address to be reproduced. In step S6, the data read by the decoder IC 9 from the optical disc 1 is subjected to demodulation and error correction processing, and writing to the buffer memory 10 is started.

In step S7, as in step S2, the table is referred to and the optimum reproduction speed for the current zone is obtained. The following step S8 is the same as step S3. If the current reproduction speed is the optimum reproduction speed, the process directly proceeds to step S10. Also,
If the current playback speed is not the optimum playback speed in step S8, the speed is switched to the optimum playback speed in step S9, as in step S4, and then step S5 is performed.
Return to and retry from the seek operation. Step S10
, The decoder IC 9 completes writing the data unit called one sector into the buffer memory 10.

In step S11, similarly to step S37 in FIG. 12, it is checked whether or not the elapsed time after receiving the read command from the host computer 14 exceeds a predetermined timeout value. If the time-out value has been exceeded, the reproduction process is terminated. If the time-out value has not been exceeded, the process proceeds to the next step S12.

In step S12, as in step S38 in FIG. 12, the CPU 11 checks whether or not it is necessary to retry the reproduction process for the currently reproduced sector due to the occurrence of a read error. If it is determined that a read error has occurred, the process proceeds to step S13 in order to perform a retry process on the sector in which the read error has occurred.

In step S13, step S39
Similarly, the retry counter x is incremented.
Subsequently, in step S14, as in step S40, the retry counter x is set to the predetermined retry count limit a.
Is determined. Retry counter x
Is determined to have reached the predetermined retry count limit a, in the next step S15, as in step S41, the reproduction speed is switched to a reproduction speed that is considered to be more stable. After the speed switching is completed, step S16
In step, as in step S42, the retry counter x is cleared. In step S17, the playback speed switched in step S15 is stored as the optimum playback speed corresponding to the currently played zone of the table,
Retry from the seek operation in step S5.

On the other hand, in step S14, if the retry counter x has not reached the predetermined retry count limit a, that is, if x <a, the current reproduction speed is maintained.
A retry is performed from the seek operation in step S5. Also,
If it is determined in step S12 that no read error has occurred, it is determined that the current sector could be reproduced without error, and the process proceeds to step S18.

In step S18, all the sectors requested by the host computer 14 are stored in the buffer memory 1.
It is determined whether the value has been stored in 0. If the result of the determination is that the number of sectors requested by the host computer 14 has not been stored in the buffer memory 10 yet, the reproduction process by the decoder 9 is continued as it is, and the process returns to step S7 to evaluate the next sector. If it is determined that the number of sectors requested by the host computer 14 is still stored in the buffer memory 10, the process proceeds to the next step S19, where the decoder IC 9 performs data transfer to the host computer 14. Then, the reproduction operation ends.

In the above example, if the speed switching operation is performed in step S15, the playback speed is not switched to the original playback speed during playback, but it is determined that the disc has passed a defective portion such as a scratch or a fingerprint on the disc. If possible, the reproduction may be continued by switching to the original reproduction speed. A case where it can be determined that a defective portion such as a scratch or a fingerprint on the disc has passed is, for example, a case where reproduction can be continuously performed without an error for a predetermined time or a case where a predetermined amount of data can be reproduced without an error. is there. Generally, an error is likely to occur in a defective portion at the time of high-speed reproduction, and a lower reproduction speed can reproduce more stably. Therefore, the defective portion is reproduced by switching to a lower reproduction speed with emphasis on stability, and after passing through the defective portion, the reproduction is switched to a higher original speed.

The optimum reproduction speed table of the optical disk being reproduced is stored in the table storage memory 12, and the optimum reproduction speed table having the same contents is stored in the nonvolatile memory 13 together with the disk code of the optical disk being reproduced. By doing so, when reproducing the same optical disk next time, the reproduction can be performed at the optimum reproduction speed read from the nonvolatile memory 13.

According to the optical disk device of the first embodiment as described above, when an error occurs during the initial reproduction, the optimum reproduction speed obtained by switching the reproduction speed corresponding to each zone is stored. By storing the table in the table storage memory 12,
When reproducing the same zone, the stored table can be read out and the zone can be reproduced at the optimum reproduction speed without repeatedly performing retries, so that the access time can be improved.

When it can be determined that a defective portion such as a scratch or a fingerprint on the disk has passed, reproduction is performed by switching to a higher original speed. Therefore, even when a defect exists on the disk, the reading speed is increased. The reproduction can be performed while minimizing the decrease in the image quality.

A nonvolatile memory 1 for storing the optimum reproduction speed table together with the disk code of the optical disk.
In the case where a plurality of optical discs are exchanged and reproduced, if the optical discs have been reproduced in the past, it is not necessary to create a new optimum reproduction speed table every time, and the learning performed during the previous reproduction is performed. Since the reproduction is performed at the optimum reproduction speed, the access time can be improved.

Embodiment 2 The configuration of the optical disk device according to the second embodiment is the same as the configuration of the optical disk device according to the first embodiment shown in FIG. The basic operation of the optical disk device according to the second embodiment is also described in the first embodiment shown in FIG.
The description is omitted because it is the same as the basic operation of the optical disk device according to the above.

FIG. 6 shows an example of the relationship between the address on the disk and the reproduction speed in the optical disk device according to the second embodiment. In the figure, the change in the reproduction speed with respect to the address on the disk is the same as in FIG. 3, and the description of the same reference numerals as in FIG. 3 is the same as in FIG.
FIG. 6 is different from FIG. 3 in that an area 15 in which data such as video and audio that require real-time properties exists is added. Here, the data that requires real-time property is
Data such as video data, audio data, etc., for which chronological continuity of data transfer is important, that is, data transfer from the decoder IC 9 to the host computer 14 is sequentially performed so as to be in time for processing by the host computer 14. It is data that needs to be done.

However, in the example of FIG. 6, the speed switching operation from the reproduction speed V2 to the reproduction speed V3 is performed at the address A2, and during this speed change, the data transfer to the host computer 14 is interrupted. Would. As a result, the host computer 14
Data transfer may not be performed in time for processing data such as audio, which may cause abnormal reproduction such as skipping of audio. Therefore, especially in the case of reproducing a data area such as video or audio that requires real-time properties, such as the area 15 shown in FIG. 15, it is desirable not to switch the speed during reproduction as much as possible.

FIG. 7 shows an example of table correction in the optical disk device according to the second embodiment. In the figure, (a) stores the optimum reproduction speed for each zone in FIG. 6 in a table. Further, (b) is a table obtained by correcting the table of (a) in accordance with a table correction operation described later so that speed switching does not occur during reproduction of data that requires real-time performance from zone Z2 to zone Z3. It is. In the table (b), the reproduction speed corresponding to the zone Z2 in the table (a) is corrected from the reproduction speed V2 to the reproduction speed V3. The timing for performing the table correction operation is as follows.
This can be done at any time until the area 15 in which data such as audio that requires real-time properties is present is reproduced. For example, this can be performed at the time of the table update processing in step S17 in FIG.

FIG. 5 is a flowchart for explaining a table correction operation in the optical disk device according to the second embodiment. In step S21, the format of the sector to be reproduced is checked, and in the next step S22, it is determined whether the result checked in step S21 is a predetermined format. Here, the predetermined format is, for example, CD-DA or CD-ROM X
A format such as A FORM2, which is a format in which data such as audio data and video data that needs to be reproduced so that data transfer to the host computer is not interrupted as much as possible is recorded. If it is determined that the format is the predetermined format, the process proceeds to step S23. If it is determined that the format is not the predetermined format, the table correction operation ends.

In step S23, the table is referred to, and in the next step 24, the table is set such that the speed is switched in the middle of the area including the sector to be reproduced and where the same format exists continuously. Is determined. If the above step S
At 24, when it is determined that the speed switching is performed,
Proceeding to step S25, the contents of the table are corrected so that speed switching is not performed in an area where the same format is continuously present. In addition, the above step S
If it is determined in step 24 that the speed switching is not performed, the table correction operation ends.

Further, as described in the first embodiment of the present invention, by storing the corrected table together with the disk code of the optical disk being reproduced in the nonvolatile memory 13 as the reproduction history, the same table as in the past can be obtained. Reproduction is possible without wasting the learning effect when reproducing the disc.

According to the optical disk device according to the second embodiment as described above, during the reproduction of data having high real-time properties such as video and audio, the optimum reproduction in the table is performed so that the speed change does not occur in the middle. Since the speed is corrected, a delay in data transfer to the host computer 14 due to the speed switching can be prevented, and skipping of sound and dropping of frames can be prevented.

By providing a nonvolatile memory for storing the corrected table together with the disk code being played back, if the optical disk has been played back in the past and has a high real-time property, it has been learned at the time of the previous playback. Since playback is performed at the optimum playback speed, skipping of sound and dropped frames can be prevented, and the access time can be improved.

Embodiment 3 The configuration of the optical disc device according to the third embodiment is the same as that of the optical disc device according to the first embodiment, and a description thereof will be omitted.

An optical disk such as a CD or DVD has an area called a lead-in in which disk information necessary for reproducing the disk is recorded at the innermost periphery. For example, C
In the lead-in area of D, TOC (Table of Co
disk information called “tracks” (corresponding to one track of an audio CD) is recorded in the TOC, and the number of tracks recorded on the disk, the format of each track, and the start of each track are recorded in the TOC. Information such as an address is included. That is, by reading the TOC information, the optical disc device can grasp what format of data is recorded on the optical disc and in what distribution.

FIG. 8 shows an example of the relationship between the address on the disk and the initial value of the optimum reproduction speed table in the optical disk device according to the third embodiment. In the figure, (a) is an address space, and as shown in FIG.
This is an example in which the A format and the CD-ROM format are mixed. It is assumed that this format distribution has been found by reading the TOC information. As described above, since the TOC information of the CD is recorded in track units, each format area of (a) is an area composed of one or a plurality of tracks, and the start position of each is determined by the track start position information of the TOC. It can be specified.
(B) shows that the address space is divided into n regions of zones Z1 to Zn. (C)
This is the initial value of the optimum playback speed table determined for each zone of (b) based on the format of the recording data. V1 and V2 are predetermined playback speeds corresponding to the CD-ROM format and the CD-DA format, respectively. Since the zones Z1 and Z2 are all in the CD-DA format, a predetermined initial value V2 for the CD-DA format is stored in the table. Zone Z3
Stores both the CD-DA format and the CD-ROM format, but stores a predetermined initial value V2 for the CD-DA format in the table of the zone Z3.
This is because the error correction capability of the CD-DA format is generally lower than that of the CD-ROM format, and an error occurs at the time of reproduction of the zone Z3 when the reproduction speed of the CD-DA format in which an error is more likely to occur is adjusted. Because they are unlikely to do so. Since the zones Z4 to Zn are all in the CD-ROM format, a predetermined initial value V1 for the CD-ROM format is stored in the table. Here, V1 and V2 are the corresponding CD-ROM format and CD-ROM format, respectively.
It is determined according to the error correction capability of the DA format.

In the above example, the predetermined reproduction speed corresponding to the error correction capability of the format is set as the initial value of the optimum reproduction speed table from the TOC information, but it is determined whether or not the recording data is data having a high real-time property. If the data is highly real-time data, the reproduction speed at which the reproduction can be performed sufficiently stably is set in the optimum reproduction speed table so that an error retry at the time of reproduction and a delay in data transfer to the host computer due to speed switching do not occur. It can also be an initial value.

According to the optical disk device according to the third embodiment as described above, the format of the recording data is determined from the disk information such as TOC recorded in a specific area of the optical disk, and the format corresponding to the format is determined. Since the table is set to the initial value based on the predetermined optimum reproduction speed, the effect of the difference in the error correction capability of the recording format can be added to the table in advance, and as a result, stable reproduction in the first reproduction is performed. It becomes possible,
Access time can be improved.

In the case of a format including data with high real-time characteristics, the effect of the data with high real-time characteristics is set in advance by setting the initial value of the optimum reproduction speed table that guarantees the time series continuity of data transfer. As a result, it is possible to prevent skipping of sound and dropped frames in the first reproduction and to improve the access time.

Embodiment 4 The configuration of the optical disc device according to the fourth embodiment is the same as that of the optical disc device according to the first embodiment, and thus the description is omitted.
FIG. 9 is an example of the relationship between the address on the disk and the initial value of the optimum playback speed table in the optical disk device according to the fourth embodiment.

In the figure, (a) is an address space. (B) shows the case where the address space is changed from zone Z1 to n of Zn.
This indicates that the area is divided into a plurality of areas. Before performing the reproducing operation as shown in FIG. 2, the optical disk apparatus reproduces only a predetermined number of sectors from the head of each zone at a predetermined reproduction speed (hereinafter, referred to as test reproduction). The predetermined reproduction speed may be any reproduction speed, but in this embodiment, the maximum speed that can be set by the optical disk device for the optical disk to be reproduced is used. In this test reproduction, as will be described later, the initial value of the optimal reproduction speed table is determined by counting the number of errors and estimating the existence of defects such as scratches and fingerprints on the disk. It is preferable to reproduce at a high reproduction speed as much as possible. In this test reproduction, data transfer to the host computer 14 is not performed. The CPU 11 counts the number of error occurrences during the test reproduction. (C) shows the number of error occurrences at the time of test reproduction for each zone of (b). (D)
This is the initial value of the optimum reproduction speed table determined by the method described later from the number of error occurrences in (c).

Next, a method of determining the initial value of the optimum reproduction speed table will be described with reference to FIG. FIG. 10 is an example of the relationship between the address on the disk and the number of errors that occurred during test reproduction in the optical disk device according to the fourth embodiment. A1, A2, A3, A4, and A
5 is each divided zone Z1, Z2, Z3, Z
4, and Z5 (not shown).
1, E2, E3, E4, and E5 each have an address A
This is the number of errors that occurred during test reproduction of only the predetermined number of sectors from 1, A2, A3, A4, and A5. The predetermined threshold 16 is a threshold for determining whether the reproduced address is a defect such as a scratch or a fingerprint on the disk. That is, if it is larger than the predetermined threshold value 16, it is determined that there is a possibility that there is a defect near the reproduced address,
If it is smaller than the predetermined threshold value 16, it is determined that there is no defect near the reproduced address. According to FIG. 10, as a result of the test reproduction, the number of errors E3 and E4 when the zones Z3 and Z4 are test-reproduced is larger than the predetermined threshold value 16, and the number of errors when the other zones are test-reproduced is the predetermined number. Is smaller than the threshold value of 16. Therefore, the zones Z3 and Z4 where the number of errors occurred are reproduced at the predetermined reproduction speed V2, and the other zones are reproduced at the predetermined reproduction speed V2.
The initial value of the optimum reproduction speed table is determined so that reproduction is performed at 1.

According to the optical disk apparatus of the fourth embodiment as described above, test reproduction is performed for a predetermined number of sectors for each zone, and the initial reproduction speed table is initialized based on the number of errors generated during test reproduction. In order to determine the value, the effect of defects such as scratches and fingerprints on the disk can be added to the table in advance, and as a result, stable playback can be performed in the first playback and the access time can be reduced. Can be improved.

[0070]

As described above, according to the optical disk apparatus of the first aspect of the present invention, the reproducing means for reproducing from the recording surface of the optical disk and the plurality of divided recording surfaces of the optical disk are provided. Memory means for storing a table for storing a reproduction speed corresponding to the zone, and repeatedly performing initial reproduction at a constant speed on the recording surface of the optical disc, and performing each reproduction when stable reproduction can be performed. The reproduction speed for each zone is stored in the table as the optimum reproduction speed, and reproduction is performed on the recording surface of the optical disk at the optimum reproduction speed for each zone read from the table, so that retry is repeated. Therefore, the reproduction can be performed at the optimum reproduction speed, and the access time can be improved.

According to the optical disk device of the second aspect of the present invention, in the optical disk device of the first aspect, in the initial reproduction, the optimum reproduction speed is continuously set without a predetermined time error. When the reproduction is successfully performed, or when a predetermined amount of data can be continuously reproduced without an error, the reproduction speed is set to a higher speed, so that there is an effect that a reduction in the reading speed can be minimized.

According to a third aspect of the present invention, in the optical disk device according to the first or second aspect, the table storing the optimum reproduction speed by the initial reproduction is a disk code of the optical disk. When the disc code of the optical disc to be reproduced matches the disc code stored by the non-volatile memory means, the table stored together with the disc code is used. Since the reproduction is performed at the above-mentioned optimum reproduction speed, if the optical disk has been reproduced in the past, it can be reproduced at the optimum reproduction speed learned at the previous reproduction. is there.

According to a fourth aspect of the present invention, in the optical disk device of the first aspect, there is provided a determination means for determining a format of information reproduced from an optical disk to be reproduced. On the condition that the discrimination result by the discriminating means is in a predetermined format, the data is stored in the table at the time of the initial reproduction so that the speed switching operation does not occur in the area where the data of the predetermined format continuously exists. Since the above-mentioned optimum reproduction speed is corrected, the occurrence of the read retry operation or the speed switching operation during the reproduction of the predetermined format is suppressed, and there is an effect that stable reproduction can be performed.

According to the optical disk device of the fifth aspect of the present invention, in the optical disk device of the fourth aspect,
Since the predetermined format is a format in which chronological continuity of data transfer to the host computer is important, particularly during reproduction of data such as audio and video,
By suppressing the occurrence of the read retry operation or the speed switching operation, there is an effect that stable reproduction that is unlikely to cause reproduction abnormality such as skipping of audio can be performed.

According to the optical disk device of the sixth aspect of the present invention, in the optical disk device of the fourth aspect, the table storing the corrected optimum reproduction speed is stored together with the disk code of the optical disk. When the disc code of the optical disc to be reproduced matches the disc code stored by the non-volatile memory means, the predetermined table is stored using the table stored together with the disc code. Since playback is performed at the above-mentioned optimal playback speed in the format,
In the case of an optical disk that has been reproduced in the past in a predetermined format, by reproducing at the optimum reproduction speed learned during the previous reproduction, stable reproduction can be performed and the access time can be improved. .

According to the optical disk device of the present invention, in the optical disk device of the present invention, the disk information recorded in a specific area of the optical disk is obtained. Means for determining the format of the recording data based on the obtained disc information and determining the initial value of the table based on a predetermined optimum reproduction speed corresponding to the format. By starting reproduction with an appropriate reproduction speed set in accordance with the reproduction speed, it is possible to perform stable reproduction in the first reproduction and to improve the access time.

According to the optical disk device of the present invention, in the optical disk device of the present invention, the predetermined optimum reproduction speed corresponding to the format depends on an error correction capability of the format. In particular, when reproducing data in a format with low error correction capability, stable reproduction can be performed in the first reproduction by suppressing the occurrence of read retries and speed switching operations. And the effect of improving the access time.

According to the optical disk device of the ninth aspect of the present invention, in the optical disk device of the seventh aspect, the predetermined optimum reproduction speed corresponding to the format is such that the result of the format determination is determined by the host computer. When the time-series continuity of data transfer to the data transfer is an important format, the playback speed is such that the time-series continuity of data transfer is guaranteed, especially when reproducing data such as audio and video. In addition, by suppressing the occurrence of the read retry operation or the speed switching operation in advance, it is possible to perform stable reproduction in the first reproduction and to improve the access time.

According to a tenth aspect of the present invention, in the optical disk device according to any one of the first to sixth aspects, only a predetermined portion of each zone is set to a predetermined reproduction speed. And an error counting means for counting errors generated during the playback. Based on a predetermined optimum playback speed corresponding to the number of errors counted by the above two means, an initial value of a table is set. Therefore, by starting playback at a playback speed that takes into account the effects of defects such as scratches and fingerprints on the disc in advance, it is possible to perform stable playback in the first playback, and reduce the access time. There is an effect that can be improved.

According to an eleventh aspect of the present invention, in the optical disk device according to the tenth aspect, the predetermined portion for each zone is a predetermined number from the head address of each zone. Since it is a sector, a predetermined number of sectors in each zone are counted, and playback is started at a playback speed that takes into account the influence of defects such as scratches and fingerprints on the disk in advance, thereby achieving stable playback in the first playback. In addition to this, there is an effect that the access time can be improved.

According to a twelfth aspect of the present invention, in the optical disk device of the tenth aspect, the predetermined reproduction speed is a maximum speed that can be set for reproducing an optical disk to be reproduced. Therefore, especially for data in a format with high error correction capability,
By starting playback at an appropriate playback speed that more reflects the effects of scratches and fingerprints on the disc, it is possible to perform stable playback in the first playback and improve access time. .

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an optical disk device according to a first embodiment.

FIG. 2 is a flowchart for explaining a reproducing operation in the optical disc device according to the first embodiment.

FIG. 3 is a diagram showing an example of a relationship between an address on a disk and a reproduction speed in the optical disk device according to the first embodiment.

FIG. 4 is a diagram showing an example of an optimum reproduction speed table in the optical disc device according to the first embodiment.

FIG. 5 is a flowchart for explaining a table correction operation in the optical disc device according to the second embodiment.

FIG. 6 is a diagram showing an example of a relationship between an address on a disk and a reproduction speed in the optical disk device according to the second embodiment.

FIG. 7 is a diagram showing an example of an optimum reproduction speed table in the optical disc device according to the second embodiment.

FIG. 8 is a diagram showing an example of a relationship between an address on a disk and an initial value of an optimum reproduction speed table in the optical disk device according to the third embodiment.

FIG. 9 is a diagram showing an example of a relationship between an address on a disk and an initial value of an optimum reproduction speed table in the optical disk device according to the fourth embodiment.

FIG. 10 is a diagram illustrating an example of a relationship between an address on a disk and the number of errors that occur during test reproduction in the optical disk device according to the fourth embodiment.

FIG. 11 is a configuration diagram of a conventional optical disk device.

FIG. 12 is a flowchart illustrating a reproducing operation in a conventional optical disc device.

FIG. 13 is a diagram showing an example of a relationship between an address on a disk and a reproduction speed in a conventional optical disk device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Optical disk 2 Spindle motor 3 Pickup 4 Lens 5 Traverse motor 6 Driver IC 7 Analog front end IC 8 Digital signal processor IC 9 Decoder IC 10 Buffer memory 11 CPU 12 Table storage memory 13 Nonvolatile memory 14 Host computer 15 Video, audio Area where data requiring real-time property such as 16 exists.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G11B 20/18 572 G11B 20/18 572C 572F F-term (Reference) 5D044 AB01 BC03 CC06 DE45 DE68 DE83 FG18 GK10 GK12 5D090 AA01 CC04 DD03 EE11 FF41 HH01 5D109 KA02 KA04 KB04 KB26 KC08 KD46 KD47

Claims (12)

[Claims] 1. A reproducing device for reproducing data from a recording surface of an optical disk, and a memory device for storing a table for storing a reproducing speed corresponding to each of a plurality of zones obtained by dividing the recording surface of the optical disk; On the recording surface of the optical disc, initial playback at a constant speed is repeatedly performed, and the playback speed for each zone when stable playback can be performed is stored in the table as an optimum playback speed. An optical disc device for performing reproduction on a recording surface at an optimum reproduction speed for each zone read from the table. 2. The optical disc device according to claim 1, wherein the optimum reproduction speed is such that, in the initial reproduction, the data can be continuously reproduced without an error for a predetermined time or a predetermined amount of data can be continuously reproduced without an error. If playback is possible,
An optical disk device, which is set to a higher reproduction speed. 3. The optical disk device according to claim 1, further comprising: a non-volatile memory unit that stores a table storing the optimum reproduction speed by the initial reproduction together with a disk code of the optical disk. When the disc code of the optical disc to be read matches the disc code stored by the non-volatile memory means, reproduction is performed at the optimum reproduction speed using the table stored together with the disc code. Optical disk device. 4. The optical disk device according to claim 1, further comprising: a discriminating means for discriminating a format of information reproduced from the optical disc to be reproduced, wherein the discrimination result by the discriminating means is a predetermined format. An optical disc device, wherein the optimum reproduction speed stored in the table at the time of the initial reproduction is corrected so that a speed switching operation does not occur in an area where data of the predetermined format continuously exists. . 5. The optical disk device according to claim 4, wherein the predetermined format is a format in which chronological continuity of data transfer to a host computer is important. 6. The optical disk device according to claim 4, further comprising: a nonvolatile memory means for storing a table storing the corrected optimum reproduction speed together with a disk code of the optical disk, wherein the disk of the optical disk to be reproduced is provided. When the code matches the disk code stored by the non-volatile memory means, reproduction is performed at the optimum reproduction speed in the predetermined format using the table stored together with the disk code. Optical disk device. 7. The optical disk device according to claim 1, further comprising: a unit for obtaining disk information recorded in a specific area of the optical disk, wherein a format of recording data is obtained based on the obtained disk information. And determining an initial value of the table based on a predetermined optimum reproduction speed corresponding to the format. 8. The optical disk device according to claim 7, wherein the predetermined optimum reproduction speed corresponding to the format is a reproduction speed according to an error correction capability of the format. 9. The optical disc device according to claim 7, wherein the predetermined optimum reproduction speed corresponding to the format is a format in which the result of the format discrimination is a format in which chronological continuity of data transfer to the host computer is important. In some cases, the reproduction speed is such that time-series continuity of the data transfer is guaranteed. 10. The optical disk device according to claim 1, wherein only a predetermined portion of each zone is reproduced at a predetermined reproduction speed, and an error for counting errors generated during reproduction is provided. An optical disc device, comprising: counting means; and determining an initial value of the table based on a predetermined optimum reproduction speed according to the number of errors counted by the two means. 11. The optical disk device according to claim 10, wherein the predetermined portion for each zone is a predetermined number of sectors from a start address of each zone. 12. The optical disk device according to claim 10, wherein the predetermined reproduction speed is a settable maximum speed for reproducing an optical disk to be reproduced.