KR20020095856A - Method for controlling data reading speed in an optical disk reader/writer - Google Patents

Abstract

PURPOSE: A method for controlling data regeneration speed of an optical record regenerator is provided to stably regenerate data recorded at a disk by setting up the optimum data regeneration speed. CONSTITUTION: A method for controlling data regeneration speed of an optical record regenerator includes the steps of receiving a regeneration command message including location information of data to be generated from a host computer(s301-s302); confirming the location included in the regeneration command message(s303), confirming an appropriate speed at the location corresponding to the location information in a speed table, and confirming match with the current speed(s304); confirming correction of an error generating in data regeneration is possible if the appropriate speed and the current speed are matched(s310); setting up the current speed as the optimum data regeneration speed of the data recorded at a disk if the error correction is possible(s309).

Description

Data playback speed control method of optical recorder {METHOD FOR CONTROLLING DATA READING SPEED IN AN OPTICAL DISK READER / WRITER}

The present invention relates to a data recording method of an optical recorder, and more particularly, to an optical recording capable of stably reproducing data recorded on an optical disk by setting an optimum reproduction speed in reproducing data recorded on an inserted optical disk. A method for controlling data reproduction speed of a player.

In general, optical recording media include read-only ROM (Read Only Memory) type, write once read many (WORM) type, rewritable rewritable type, and the like, depending on whether repeat recording is possible. It is classified into three kinds.

Here, the ROM type optical recording medium includes a compact disc (CD) ROM, a digital versatile disc (DVD), and the like. The WORM type and optical recording medium include a write once compact disc (CD-R: Recodable Compact Discs) and Recordable Digital Versatile Discs (DVD-R).

In addition, freely rewritable discs include a rewritable compact disc (CD-RAM) and a rewritable digital versatile disc (DVD-RAM).

Meanwhile, as shown in FIG. 1, a general optical disc is divided into a lead-in area 101, a user area 102, and a lead-out area 103. Here, in the lead-in area 101 and the lead-out area 103, information about a defective area of the disc, data record information and the like stored in the user area 102 are recorded.

As such, the data area and track information stored in the user area 102 can be obtained from the information recorded in the lead-in area 101 and the lead-out area 103.

On the other hand, the state of the disc inserted into the optical recorder may have various situations. Here, there may be a standard disc condition without a defect, a disc where scratches or the like occur on the standard disc, a curved disc due to a storage error, a disc due to a manufacturing defect, or the like.

In addition, these discs are disks that may affect the servo system that drives the disk according to each state, and disks that do not affect the servo system but may have error correction in reproducing data recorded on the disk. It is largely distinguished.

At this time, a disk that affects a servo system such as a curved disk has a tendency to increase a tracking error of the servo system when accessing a defective area at high speed, thereby reproducing data. Many error corrections occur, affecting the entire system such as servo system and data reproducing system. Such a disk has more influence on data reproduction near the outer peripheral area than the inner peripheral area of the disk.

In addition, the disk on which scratches or the like have been generated generates a large amount of error correction when the data is reproduced, and the areas where the scratches or the like are generated are randomly generated without distinguishing between the inner and outer regions.

On the other hand, the data reproduction speed control method of the conventional optical recorder performs the reproduction of the data recorded on the disc at the highest data reproduction speed that can be performed according to the performance of the optical recorder, regardless of the state of the inserted disc.

If data cannot be reproduced at the corresponding double speed due to a defect of a disc or the like during data reproduction at such highest data reproduction speed, the data reproduction speed is decelerated step by step to find a suitable data reproduction speed. Therefore, it takes a long time to find a suitable data reproduction speed, and data reproduction is unstable.

SUMMARY OF THE INVENTION The present invention provides a data reproduction speed control method of an optical recorder capable of stably reproducing data by setting an optimum reproduction speed in reproducing data recorded on an optical disc. Has its purpose.

1 is a diagram conceptually showing a configuration of a conventional optical disc.

2 is a schematic configuration diagram of a general optical recording and reproducing system.

3 is a flowchart illustrating a method of controlling the data reproduction speed of the optical recording / reproducing apparatus after confirming whether an error can be corrected according to the present invention.

4 is a diagram illustrating a data reproduction speed control method of an optical recorder in which a double speed table is implemented according to the present invention.

5 is a diagram illustrating tracking errors detected in normal and damaged areas of a general optical disc.

<Description of reference numerals appearing in the drawing>

201: disk 202: data processor

203: ECC memory unit 204: servo system

205: micom 206: host

One aspect of the present invention for achieving the above technical problem is a step of receiving a playback command message including the position information of the data to be reproduced; (B) checking a position included in the received play command message, checking a proper speed at a position corresponding to the position information, and confirming that it matches the current speed; (C) checking whether an error occurring during data reproduction can be corrected when the proper speed matches the current speed in step (B); (D) if the error occurring in step (C) is correctable, setting the optimum data reproduction speed of the data recorded on the disc with the current speed in the step (B).

Another aspect of the present invention for achieving the above technical problem is that (A) when the disc is inserted into the optical record player, the highest data reproduction speed of the optical record player is selected with reference to the information recorded on the disk. step; (B) the pickup is moved to a position included in the received play command message; (C) detecting an error amount in reproducing data at a position included in the reproduction command message, and if the detected error amount exceeds an appropriate level, checking whether the detected error is correctable; (D) if the detected error can be corrected, selecting the data reproduction speed selected in the step (A) as an optimum data reproduction speed.

Hereinafter, a method of controlling data reproduction speed of an optical recorder according to an exemplary embodiment of the present invention will be described in detail with reference to FIGS. 2 to 5.

2 is a schematic configuration diagram of a general optical recording and reproducing system.

As shown in Fig. 2, a general optical recording / reproducing system includes a disk 201, a data processor 202 for processing data read from the disk 201 and data to be recorded on the disk 201, and An ECC memory unit 203 in which data in units of ECC blocks in which the data processor 202 reads / writes data is stored, a servo system 204 for controlling driving of the disk 201, and the data processor 202. A microcomputer (hereinafter, abbreviated as a microcomputer) 205 for controlling the microcomputer 205 and a host 206 for requesting data from the microcomputer 204 are included.

Next, a method of controlling the data reproduction speed of the optical recorder according to the present invention will be described with respect to the optical recorder system having the above configuration.

3 is a flowchart illustrating a method of controlling the data reproduction speed of the optical recording / reproducing apparatus after confirming whether an error can be corrected according to the present invention.

As shown in Fig. 3, when the disc 201 is inserted into the optical recorder (s301), from the information recorded in the lead-in area 101 and the lead-out area 103 of the inserted disc 201, The recording information of the data stored in the user area 102 of the disk 201 is obtained, and a reproduction command message including the location information of the data to be reproduced is transmitted from the host computer (S302). In this case, the proper speed of the position included in the playback command message is checked in the speed table where the data playback speed for each area in the disc 201 is set (s303).

Then, it is checked whether the proper speed determined in the speed table and the current speed match (S304).

In the checking step (S304), if the proper speed shown in the table and the current speed does not match, a process of shifting the servo is performed so that the speed of the servo can be a proper speed (s305).

On the other hand, in step S304, when the proper speed determined in the speed table matches the current speed, the pickup is moved to a position where data to be reproduced exists (s306).

Then, it is checked whether the pickup is properly moved to the position to be played (s307).

In step S307 of checking whether the pickup is moved to the position to be played, an error generated when the pickup is not located on the track of the data to be played is checked, and whether the error occurrence is at an appropriate level. (s308).

In step S308, when an error occurs at an appropriate level, the current speed is selected as an appropriate data reproduction speed (s309).

On the other hand, in the step s308, if the error occurrence exceeds the appropriate level, it is confirmed whether the correction of the generated error is possible (s310), and if the error correction is possible, correcting the generated error, The reproduction speed of the current data is selected as an appropriate transmission speed (s309).

In step S310, when it is determined that the error is impossible to be corrected, the servo is driven at a speed that is one step slower than the current speed at step S311. It is to be performed again from (s306).

On the other hand, if it is found in step S310 that error correction is possible, the current data reproduction speed is selected as an appropriate speed (s309).

On the other hand, in step s307, when the pickup is located on the track on which the data to be reproduced is recorded, step (s310) of checking whether error correction is possible is performed, and if error correction is possible, step (s309) is performed. If error correction is not possible, step S311 is performed, and then step S306 is performed again.

4 is a diagram illustrating a data reproduction speed control method of an optical recorder in which a double speed table is implemented according to the present invention.

As shown in FIG. 4, when the disc 201 is inserted into the reproducing drive (s401), a reproducing command message including location information of data to be reproduced is received from the host computer (s402).

Then, the position information included in the received playback command message is detected, and the pickup is moved to the detected position (s403). In this case, it is checked whether the pickup is correctly moved to the track on which the data to be reproduced is recorded (s404).

In the checking step s404, when the pickup is moved to the position of the data track to be reproduced, it is checked whether error correction is possible (s405).

On the other hand, in the checking step (s404), if the pickup is not properly moved to the position of the data track to be reproduced, it is checked whether the tracking error level is an appropriate level (s406).

5 is a diagram illustrating tracking errors detected in normal and damaged areas of a general optical disc. As shown in FIG. 5, the tracking error of a normal disc is shown as (a) in the form of a small sine wave, and when the state of the disc is not good, the birefringence is severe depending on the degree. .

As described above, when the determination result in step s406 refers to the tracking error generated when the data recorded on the disc 201 is reproduced, the tracking error level generated when the disc 201 is reproduced is an appropriate level. In step S407, it is determined whether the servo movement normally follows the track without generating a back jump. At this time, when the servo normally follows the track of the disc 201 as a result of the determination in step s407, the error occurrence rate is confirmed in reproducing the data recorded on the disc 201 (s408). When the corrected error correction is at an appropriate level, the current data reproduction speed is set to the appropriate data reproduction speed of the inserted disc 201 (s409).

On the other hand, as a result of the determination in step s406, when the tracking error level generated during the reproduction of the data recorded on the disc 201 exceeds an appropriate level, and the servo in the step s407, the servo 201 If it is not possible to follow the track of the normal and the step (s408) to determine whether the error that occurs when the error level exceeds the appropriate level (s405) is performed.

In step S405 of checking whether the error correction is possible, if the error correction is possible, the current data reproduction speed is selected as an appropriate speed (s409).

On the other hand, in the step of checking whether the error correction is possible (s405), if error correction is not possible, selecting a data playback speed one step slower than the current data playback speed (s410), and then checking the pickup position Retry from (s404).

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. . Therefore, the true technical protection scope of the present invention will be defined by the appended claims technical spirit.

As described above, the data reproduction speed control method of the optical recorder according to the present invention checks whether an error occurring during data reproduction of an inserted disc can be corrected, and if error correction is possible, There is an advantage that the data recorded on the disc can be stably reproduced.

Claims (7)

(A) receiving a play command message including the location information of the data to be reproduced from the host computer; (B) checking a position included in the received playback command message, checking a proper speed at a position corresponding to the position information in a speed table, and confirming that the speed matches the current speed; (C) checking whether an error occurring during data reproduction can be corrected when the proper speed matches the current speed in step (B); (D) if the error occurring in step (C) is correctable, setting the optimum data reproduction speed of the data recorded on the disc with the current speed in step (B). Control method of data reproduction speed of optical record player. The method of claim 1, wherein step (B) (B1) further comprising shifting the servo so that the current double speed becomes the proper double speed when the proper double speed does not coincide with the current double speed. The method of claim 1, (C1) In the step (C), if it is confirmed that the error correction is possible, if the error correction is not possible, further comprising the step of driving at a data reproduction double speed slower than the current double speed Control method of data reproduction speed of optical record player. (A) when the disc is inserted into the optical recorder, selecting the highest possible data reproduction speed of the optical recorder by referring to the information recorded on the disk; (B) the pickup is moved to a position included in the received play command message; (C) detecting an error amount in reproducing data at a position included in the reproduction command message, and if the detected error amount exceeds an appropriate level, checking whether the detected error is correctable; And (D) when the detected error is correctable, selecting the data reproduction speed selected in the step (A) as an optimum data reproduction speed. The method of claim 4, wherein step (C) (C1) detecting a tracking error level generated in reproducing the data; (C2) when the tracking error level is detected as a result of the detection of the tracking error level in the step (C1), determining whether the back jump occurs because the pickup does not normally follow the track of the disc; (C3) detecting the amount of error generated in reproducing data if the back jump of the pickup does not occur as a result of determining whether the back jump of the pickup occurs in the step (C2); (C4) if the detected error amount exceeds an appropriate level, checking whether the detected error is correctable, further comprising the step of controlling the data reproduction speed of the optical recorder. The method of claim 5, (C5) As a result of the detection of the tracking error level in the step (C1), when the tracking error level exceeds an appropriate level, and as a result of the determination of whether the back jump of the pickup occurs in the step (C2), the back of the pickup If a jump is generated, checking whether the error can be corrected; and if the detected error amount exceeds a suitable level in the step (C4), checking whether the detected error is correctable. A data reproduction speed control method of an optical recorder, characterized in that. The method according to claim 4 to 6, If correction of the detected error is not possible, change the data reproduction speed to one step lower than the data reproduction speed performed in step (A) and perform the steps (C1) to (C5) again to optimize the data. A data reproduction speed control method for an optical recorder characterized by selecting a reproduction speed.