JP2003059067A - Disk reproduction device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk reproduction device capable of shortening reproducing time and enhancing the reliability of data reproduction. SOLUTION: The seek time is measured by seeking the specified section after the acquisition of the disk information is finished, and when this seek time exceeds the prescribed time, the seek time is again measured by reducing the speed, then, the instruction of reproduction from the host side is executed at the reproduction speed such as completing the seek operation within the prescribed time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc reproducing apparatus.

[0002]

2. Description of the Related Art Generally, a CD, a CD-
In a disk reproducing apparatus for reproducing an optical disk such as R / W, DVD, S-DVD, etc., the disk reproducing apparatus carries out pre-reading, and the data of the reproduction address in the reproduction command from the next host computer is within the pre-reading range. If the data is in the internal buffer memory, transfer the data read from the buffer memory to the host computer, and if the playback address is not in the buffer memory,
The data is played directly from the disc and the data is transferred to the host computer.

For example, in a DVD reproducing apparatus, the inserted disc is a DVD-Video Disc (DVD
If it is a video disc), the movie will be frame-fed if the read ahead is not always performed. D
Image data is continuously recorded on the VD video disc, and the reproduction command from the host computer is of course continuous address reproduction. When a data error occurs due to dirt on the disc during playback of the DVD video, the playback process is stopped and the playback retry is not performed.

Normally, the reproduction retry is effective for the reproduction address in the reproduction command, and the reproduction retry for the prefetch is not considered in the host interface standard. In other words, when the address reproduction in the reproduction command results in an error, it is common to perform a predetermined reproduction retry and try to increase the data reproduction probability by the retry.

However, a disc such as a DVD-Video has a high data recording density on the disc, and if data is read from the disc when a reproduction command from the host computer is received, a movie is frame-fed. Since the buffer memory is empty, it is necessary to always read ahead. Even if the prefetch ends in error, it is necessary to carry out a reproduction retry and always store sufficient reproduction data in the buffer memory.

On the other hand, depending on the type of disk, pre-read data is not always transferred to the host computer. Discs other than video discs have many directories and files, and files are not recorded continuously.
The playback command address from the host computer is not continuous and often requests an area outside the prefetch range. In this case, if pre-reading is always performed, conversely, the reproduction efficiency decreases. That is, when there is no requested address within the pre-read range, pre-reading must be intentionally stopped and the reproduction is started from the target address on the disk, which deteriorates the reproduction efficiency.

[0007]

As described above, in order to prevent frame-by-frame advance of moving image reproduction in the disc reproducing apparatus, even if a reproducing error occurs during pre-reading, reproduction retry is carried out so that the disc is always recorded on the disc. Data buffering is effective for data errors, but not effective for seek errors.

That is, the disk reproducing apparatus reproduces data from the disk and transfers the data to the host computer in response to a reproduction command from the host computer, but normally, the maximum rotation speed is set when the disk is inserted. At the time of this read operation, seek may be performed to the target address, and the seek operation may fail due to physical characteristics of the disk or scratches, and seek retry may be performed.

When this seek also reaches the upper limit of the retry, it is common to reduce the rotational speed of the disk and perform the seek operation again. In this case, the seek operation is retried or the deceleration processing is performed, so that the playback time becomes long and the playback performance is degraded. Also, when such a disk is used, even if the seek is successful, many data errors occur and the read process is retried.
Playback performance is degraded.

In this case, although the error occurrence rate is reduced by decelerating the rotational speed of the disk, if the deceleration processing and the retry described above are executed when the reproduction command of the host computer is executed, Windows (registered trademark) is used.
Under the OS environment, a reset is issued, causing a blue screen or restarting the personal computer.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a disk reproducing apparatus capable of improving the reliability of data reproduction and shortening the reproduction time.

[0012]

In order to solve the above-mentioned problems, the disk reproducing apparatus according to the present invention comprises means for, after the end of acquisition of disk information, means for seeking a predetermined section and measuring the seek time, When the seek time exceeds a predetermined time, it has means for decelerating and measuring the seek time again, and executes a playback command from the host side at a playback speed at which the seek operation ends within the predetermined time. .

Here, the predetermined time is preferably determined based on the rotation speed of the disk. Further, it is preferable that the means for measuring the seek time does not measure the seek time when the disc is a video disc.

The disc reproducing apparatus according to the present invention comprises means for measuring a number of data errors by reproducing a plurality of predetermined areas after the disc information has been acquired, and, when the number of data errors exceeds a predetermined value, It has means for decelerating and again measuring the number of data errors, and executes a reproduction command from the host side at a reproduction speed at which the number of data errors becomes a predetermined value or less.

It is preferable that each of the disk reproducing apparatuses according to the present invention is provided with a means for outputting a warning when the reproducing speed becomes lower than the minimum reproducing speed.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. First, an outline of a disc reproducing apparatus to which the present invention is applied will be described with reference to the block diagram of FIG. This disk reproducing apparatus has a central processing unit LSI (CPU) 1 that controls the operation of the entire apparatus and also functions as a seek time measuring means and a data error number measuring means according to the present invention, and is erasable and rewritable. A non-volatile memory (flash memory) 2, a host I / F controller 3 configured by an LSD that controls communication between the host computer and the device, and an LSI that controls transfer data from the host computer and data read from the disk. It comprises a configured buffer manager 4 and a buffer memory 5 consisting of a DRAM for temporarily storing the transfer data from the host computer and the data read from the disk.

Further, a subcode operation controller 6 composed of an LSI for generating a subcode to be recorded on the disc and separating the subcode read from the disc (SUB P, R, R ..., W), and CD- RO
A CD-ROM encoder 7 composed of an LSI for modulating M data before writing it on a disc, a memory 8 composed of an SRAM for storing program variables and the like, and a reproduced CD-
CD-ROM composed of LSI for demodulating ROM data
A decoder 9 and an audio controller 10 composed of an LSI for controlling music reproduction are provided.

Further, a system controller 11 composed of an LSI for controlling the recording / reproducing of information on the disc,
A CD encoder 12 composed of an LSI that modulates user data and a subcode so as to conform to the disc standard before recording information on the disc, and an L that separates and reproduces information reproduced from the disc into user data and a subcode.
C composed of an SI (CD) and an LSI (DVD) that decodes information reproduced from a disc as user data
The D / DVD encoder 13, the servo 14, and the spindle controller 15 for controlling the rotation of the disk are provided.

This disc reproducing apparatus can change the rotational speed (reproducing speed, reproducing speed) of the disc 16 inserted by the spindle controller 15.

Therefore, a first embodiment of the present invention in this disk device will be described with reference to FIG. In the first embodiment, the disc is inspected before the reproduction command from the host computer is executed, that is, at the disc mounting process, and the optimum speed is set.

First, when the disk 17 is inserted, servo processing such as spindle motor rotation, focus and tracking processing is executed to obtain track information on the disk 17. Then, the seek time measuring process according to the present invention is performed.

First, the seek address is set and the timer is started. Next, the seek process is executed, the timer is terminated, and the seek time is stored in the memory. This process is executed several times to obtain the average seek time. Therefore, it is determined whether or not the number of trials of seek time measurement reaches a predetermined number, and the number of seek time measurement trials reaches a predetermined number of times. The seek time measurement process is repeated until (the number of trials is exceeded).

In this case, the seek address is set again and the seek time is measured. It is preferable that the seek address is changed each time and the address is set in consideration of the entire surface of the disk.

Then, when the number of trials of seek time measurement reaches a predetermined number of times (trial count exceeds), the measured seek time average value is calculated. Next, it is determined whether or not the calculated average seek time exceeds a predetermined value (predetermined time) (average value> predetermined value).

At this time, if the average value is not larger than the predetermined value, that is, if the average value is smaller than the predetermined value, the reproduction speed is set as the current speed, and the processing by the reproduction command from the host computer is executed.

On the other hand, if average value> predetermined value,
The deceleration processing for reducing the rotation speed one rank lower is executed. Then, it is determined whether or not the result of deceleration is the lowest speed possessed by the disc reproducing apparatus.

At this time, if the result of deceleration is not the minimum speed, the process returns to the seek address setting process again, the seek time is measured again at the decelerated speed, and then the above-described average value calculation and comparison with a predetermined value are performed. To do. If the average value> the predetermined value does not hold as a result of the deceleration, the reproduction speed after deceleration is set as the current speed as described above, and the process according to the reproduction command from the host computer is executed.

On the other hand, if the result of deceleration is the minimum speed, a warning flag is set and this process ends.
When this warning flag is set, the front LED (access lamp) of the disk player is made to blink at an arbitrary cycle, and a warning error is set in the end processing of the playback command from the host computer. And outputs a warning (including visual display and audio display).

As described above, the seek time is measured before the playback command is executed from the host computer, and the rotation speed is set so as to be within the predetermined seek time, so that the playback command is executed from the host computer. The data reproduction rate (reliability) is improved, reproduction retry and deceleration processing can be avoided, and the reproduction time can be shortened. As a result, for example, a reset will not be issued under the Windows OS environment, and a problem such as a blue screen or a restart of the personal computer can be avoided.

In the above process, the predetermined time (predetermined value) is determined based on the rotation speed of the disk. That is, since the seek time changes depending on the rotation speed of the disk, the seek time corresponding to the rotation speed of the disk is determined using the table of the seek time thresholds for the disk rotation speed and the seek distance as shown in Table 1, If it exceeds, slow down.

[0031]

[Table 1]

By thus determining the threshold value of the seek time according to the disk rotation speed, the disk inspection can be correctly executed.

Further, by outputting a warning when reproduction is not possible unless the minimum rotation speed supported by the disk device is used, it is possible to inform the user that the disk is not suitable for reproduction. The user can take measures such as cleaning the disc to improve the reproduction efficiency of the disc, or take safe measures such as backing up the data on the disc.

Next, the processing according to the second embodiment of the present invention will be described with reference to FIG. This second embodiment also
The disc is inspected before the playback command from the host computer is executed, that is, during the disc mounting process, and the optimum speed is set.

First, as in the first embodiment, the servo process for reproducing the disc information is executed, and the process for obtaining the track on the disc and the disc information is executed. After that, the seek time measuring process is executed here like the process of the first embodiment, but this measuring process is optional.

Then, the reproducing address is set and the reproducing process is executed. Then, it is determined whether or not the number of reproduction errors exceeds a predetermined value. At this time, if the number of playback errors does not exceed the predetermined value, check the number of trials. If the number of trials has not been reached (if the number of trials is not exceeded), set the next playback address and perform playback. Return to processing. At this time, the reproduction address is changed each time, and the reproduction area is set in consideration of the entire surface of the disc. Then, when the number of trials is exceeded, this processing is ended.

On the other hand, when the number of reproduction errors exceeds the predetermined value, the deceleration processing for decelerating the rotational speed one rank lower is executed. Then, it is determined whether or not the result of deceleration is the lowest speed possessed by the disc reproducing apparatus.

At this time, if the result of the deceleration is not the lowest speed, the process returns to the reproduction address setting process again, the reproduction process is performed at the decelerated speed, and then the process returns to the process of comparing the reproduction error number with the predetermined value.

On the other hand, if the result of deceleration is the minimum speed, a warning flag is set and this process ends.

As described above, the number of reproduction data errors is measured before the reproduction command is executed from the host computer,
By setting the rotation speed so that it falls within the specified number of playback data errors, the data playback rate (reliability) is improved when playback commands are executed from the host computer, and playback retry and deceleration processing can be avoided, and playback time can be reduced. Can be shortened. As a result, for example, Windows OS
Reset will not be issued under the environment, and you can avoid problems such as blue screen and PC restart.

Next, a third embodiment of the present invention will be described with reference to FIG.
Will be described with reference to. In this embodiment, whether or not to execute the seek time measuring process and the data error number measuring process is selected according to the type of the inserted disc. In this case, the processing is different depending on whether the inserted disc is a CD or a DVD, but it is determined whether a VideoCD is inserted for a CD or a DVD-Video is inserted for a DVD. In this determination method, a predetermined file information area (in the case of a Video CD, a character "VIDEO" is recorded by ASSCCI in a specific place) is reproduced and it is confirmed whether or not video information is recorded.

Therefore, referring to the figure, first, the file information address of the inserted disc is reproduced to determine whether or not the disc is a video disc (Video Disc). At this time, if the inserted disk is Video Disc, the seek time measurement process and the data error number measurement process are executed. If the inserted disk is not Video Disc, the seek time measurement process and the data error number measurement process are not executed, and this process is terminated.

That is, in the case of a video disc, unlike file data, image contents are continuously recorded from the inner peripheral position toward the outer periphery. Therefore, when reproducing this disc, the reproduction address from the host computer is used. Is also set in ascending order, which greatly reduces the occurrence of seeks. Therefore, when reproducing such a disc, it is not necessary to measure at least the seek time, and the inspection by the seek time measurement is performed for a disc other than the video disc, whereby wasteful processing time can be omitted. .

[0044]

As described above, according to the disc reproducing apparatus of the present invention, the seek time is measured before executing the reproducing command from the host computer, and the rotation is set so as to be within the predetermined seek time. Since the speed is set, the data reproduction rate (reliability) is improved when the reproduction command is executed from the host computer, reproduction retry and deceleration processing can be avoided, and the reproduction time can be shortened.

Here, by determining the predetermined time based on the rotation speed of the disk, an accurate inspection can be performed. Further, the seek time measuring means does not measure the seek time when the disk is a video disk, thereby avoiding wasteful processing.

According to the disc reproducing apparatus of the present invention,
Before the playback command from the host computer is executed, the number of data errors is measured and the rotation speed is set so that it falls within the predetermined number of data errors. Property) is improved, reproduction retry and deceleration processing can be avoided, and reproduction time can be shortened.

In each of the disk reproducing apparatuses according to the present invention, when the reproduction speed becomes lower than the minimum reproduction speed, a warning is output to clean the disk.
Appropriate measures such as data backup will be taken.

[Brief description of drawings]

FIG. 1 is a block diagram illustrating a disc reproducing device to which the present invention is applied.

FIG. 2 is a flow diagram illustrating processing of the first embodiment of the present invention.

FIG. 3 is a flow diagram illustrating processing of the second embodiment of the present invention.

FIG. 4 is a flowchart illustrating processing according to the third embodiment of the present invention.

[Explanation of symbols]

1 ... CPU, 2 ... Flash memory, 3 ... Host I / F
Controller, 4 ... Buffer manager, 5 ... Buffer memory, 6 ... Subcode operation controller,
7 ... CD-ROM encoder, 8 ... Memory, 9 ... CD-
ROM decoder, 11 ... System controller 11, 1
2 ... CD encoder, 13 ... CD / DVD encoder,
15 ... Spindle controller, 17 ... Disk.

Claims (5)

[Claims] 1. A disk reproducing apparatus capable of changing a reproducing speed and reproducing data on a disk at a predetermined reproducing speed, and means for seeking a predetermined section and measuring the seek time after completion of acquisition of the disc information. And, when the seek time exceeds a predetermined time, it has means for decelerating and measuring the seek time again, and executes a play command from the host side at a play speed at which the seek operation ends within the predetermined time. A disk reproducing device characterized by being. 2. The disc reproducing apparatus according to claim 1, wherein the predetermined time is determined based on a rotational speed of the disc. 3. The disc reproducing apparatus according to claim 1, wherein the seek time measuring unit does not measure the seek time when the disc is a video disc. 4. A disk reproducing apparatus capable of changing a reproduction speed and reproducing data on a disk at a predetermined reproduction speed, and after acquiring disk information, reproduces a plurality of predetermined areas to measure the number of data errors. And a means for measuring the number of data errors again by decelerating when the number of data errors exceeds a predetermined value, and a playback command from the host side at a playback speed at which the number of data errors falls below a predetermined value. A disc reproducing apparatus characterized by executing. 5. The disc reproducing apparatus according to claim 1, further comprising means for outputting a warning when the reproducing speed is equal to or lower than a minimum reproducing speed.