KR19980067775A - How to reduce error correction time of digital video disc (DVD) - Google Patents

Abstract

The present invention relates to a method for shortening an error correction time of a digital video disc (DVD), particularly comprising: reading reproduction data from an optical disc and performing a first error correction processing of the reproduction data; Determining whether or not the first error correction processing is successful; Performing error detection processing when error correction is successful in the first error correction determination step; Judging whether an error is detected in the result processed in the error detection processing step, success processing when no error is detected, and fail processing if detected; Performing a second error correction process and a first error correction process sequentially when error correction fails as a result of the determination in the first error correction determination step; Determining whether error correction is successful with respect to a result of the first error correction process; And performing an error detection processing step when the error correction is successful as a result of the determination of the second error correction determining step, and failing when the error correction is not successful. Therefore, in the present invention, the second error correction process is performed only when the error occurrence rate is high, thereby reducing the error correction time while maintaining the reproduction reliability.

Description

How to reduce error correction time of digital video disc (DVD)

The present invention relates to a method for shortening the error correction time of a digital video disc (DVD). In particular, the second error correction process (PO) is performed only when the error of the reproduction data is severe, thereby shortening the error correction time. A method of reducing error correction time of a digital video disc (DVD) can reduce processing time.

Fig. 1 is a block diagram showing the structure of a conventional digital video disc (DVD) (hereinafter referred to as DVD) reproducing apparatus, which is a DVD disc 10 in which data is recorded and reproduced optically, as shown in FIG. A data processor 20 for analyzing the format of the data read out from (10) and performing error correction; a buffer memory 40 for storing data in which errors transmitted through the data processor 20 are corrected; and a command input unit; And a control unit 80 for controlling the data processing unit 20 and the buffer memory 40 in response to the command signal supplied from the command input unit 60.

The operation of the conventional apparatus configured as described above will be described with reference to the flowchart of FIG. 2.

As in step 1 (S1) of FIG. 2, the reproduction data is read out from the DVD disc 10 by optical pickup (not shown), and the reproduction data is corrected and output by the data processing unit 20. FIG.

In the data processing unit 20, the error correcting operation may include a first error correction process (PI), a second error correction process (PO), and a first error correction process (PI) in steps S2, S3, and S4. The combination and order of the steps S2, S3, and S4 can be repeated. In step S4, the error correction judgment step (S5) of checking the result of the error correction processing to determine whether the success is performed, and if the error correction fails in the determination result of the error correction judgment step (S5), the error processing step (S6) ) To terminate the error correction operation.

On the other hand, if the error correction is successful, after performing the error detection (EDC) processing step (S7) for the result, error detection to determine whether there is no problem in error correction for the processing result in step (S7) Perform step S8. At this time, when an error occurs, the error correction operation is terminated by performing a failure processing step (S5), and when the error does not occur, a success processing operation (S9) is performed and the error correction operation is terminated.

Here, the error detection processing (EDC) can be performed in real time, but the first error correction processing (PI) and the second error correction processing (PO) take about 16 times as long as the characteristics of the data format itself.

Therefore, as described above, the conventional error correction method repeats the same process irrespective of the occurrence rate of the error, so that the data access time by the error correction process becomes long in the peripheral device of the computer which requires high-speed random access such as a DVD ROM. There is a problem of poor performance of the system.

An object of the present invention is to reduce the average data processing time by reducing the error correction time by performing a second error correction processing (PO) only when the error of the playback data is severe to solve the above problems. The present invention provides a method for reducing error correction time of a disc (DVD).

In order to solve the above problem, the method of the present invention comprises the steps of: reading reproduction data from an optical disc and processing the reproduction data with a first error correction process; Determining whether or not the first error correction processing is successful; Performing error detection processing when error correction is successful in the first error correction determination step; Judging whether an error is detected in the result processed in the error detection processing step, success processing when no error is detected, and fail processing if detected; Performing a second error correction process and a first error correction process sequentially when error correction fails as a result of the determination in the first error correction determination step; Determining whether error correction is successful with respect to a result of the first error correction process; And performing an error detection processing step when the error correction is successful as a result of the determination of the second error correction determining step, and failing when the error correction is not successful.

1 is a block diagram illustrating a digital video disc (DVD) ROM drive.

2 is a flowchart for explaining a conventional error correction method.

3 is a flow chart for explaining the error correction method according to the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

3 is a flow chart for explaining the error correction method according to the present invention will be described with reference to FIG.

As shown in FIG. 1, the reproduction data is read out from the DVD disc 10 by optical pickup (not shown) (S1), and the reproduction data is outputted after the error is corrected by the data processing unit 20. 1 Error correction processing is performed (S2).

The data on which the first error correction process has been performed is checked in the first error correction judging step (S3) to see if error correction has been successfully performed, and if error correction has been successful, error detection process (EDC) (S4). Perform

The result of the error detection process (EDC) is judged to check whether an error is detected (S5), if an error is detected as a result of the check, success processing (S6), and if an error is not detected, fail processing (S7), End the operation.

On the other hand, if it is determined that the error correction of the first error correction step (S3) has not been successful, the second error correction processing (PO) (S8) and the first error correction processing (PI) (S9) sequentially To do it.

Then, it is checked whether the error correction of the data processed in the first error correction processing (PI) (S9) has been successfully performed (S10). If the error is not corrected, the operation is terminated after the failure processing (S7). When the data is successfully corrected, an error detection process (EDC) S4 is performed.

The data in which error correction is completed by the above operation is stored in the buffer memory 40 of FIG. 1, and the data stored in the buffer memory 40 generates a control signal according to the command signal of the command input unit 60 ( 80 is controlled and output.

Therefore, as described above, in the present invention, the second error correction process is performed only when the failure is performed after the first error correction process, that is, the second error correction process is performed only when the error occurrence rate is high, thereby maintaining error correction while maintaining the reproduction reliability. By shortening the time, the overall average data processing time is reduced, thereby improving the performance of the system.

Claims (1)

Reading playback data from the optical disc and processing the first error correction processing of the playback data; Determining whether or not the first error correction processing is successful; Performing error detection processing when error correction is successful in the first error correction determination step; Judging whether an error is detected in the result processed in the error detection processing step, success processing when no error is detected, and fail processing if detected; Performing a second error correction process and a first error correction process sequentially when error correction fails as a result of the determination in the first error correction determination step; Determining whether error correction is successful with respect to a result of the first error correction process; And performing the error detection processing step when the error correction is successful as a result of the determination of the second error correction determining step, and failing when the error correction is not successful. How to reduce error correction time of DVD).