KR100189533B1 - Error correction control apparatus and method of digital video disc reproduction appliance - Google Patents

Abstract

1. Technical field to which the invention described in the claims belongs

This technique relates to digital video disc reproduction.

2. Technical Challenges to be Solved by the Invention

And an apparatus and a method for reducing an unnecessary time required for error correction.

3. The point of the solution of the invention

A method for controlling an error correction of a digital video disk reproducing apparatus, comprising the steps of: determining whether an error has been corrected; determining if the error has been corrected; determining whether the error is corrected; And if it is set to reshick as a result of the determination, error correction is performed again in the current error correction block after reshack, and if not set to reshack, error correction is again performed in the current error correction block And performing error correction for the next error correction block when the error is corrected when the error is corrected or when the iterative correction is not possible.

4. Important Uses of the Invention

Used to control error correction during digital video disc playback.

Description

Apparatus and method for error correction control of digital video disk reproducing apparatus

FIG. 1 is a diagram showing a partial configuration of a conventional digital video disk reproducing apparatus; FIG.

FIG. 2 is a flowchart showing an error correction control process of a conventional digital video disk reproducing apparatus.

FIG. 3 is a diagram showing a partial configuration of a digital video disk reproducing apparatus according to an embodiment of the present invention; FIG.

FIG. 4 is a flowchart illustrating an error correction control process of a digital video disk player according to an embodiment of the present invention; FIG.

FIG. 5 is a waveform diagram of signals generated in an error correction control process according to an embodiment of the present invention; FIG.

DESCRIPTION OF THE REFERENCE NUMERALS

230: error correction unit 250: demodulation unit

270: memory controller 280: memory

400: Disk drive control unit 500: Microcomputer

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc reproducing apparatus, and more particularly, to an error correction controlling apparatus and method in a digital video (or versatile) disc reproducing apparatus.

The digital video disk is one of the digital moving picture disk media, and it is a next generation high quality and high quality quality multimedia storage device which stores digital picture of Moving Picture Experts Group (MPEG) 2 for 2 hours or more.

Generally, in a digital video or audio communication system, an error occurs due to various reasons (noise, inter-code interference, reproduction mechanism change, media error, etc.) in the recording or reproducing process. Without correcting the error, Can not be delivered. Therefore, errors are detected and corrected by various methods.

FIG. 1 shows a partial configuration of a conventional digital video disk reproducing apparatus. The memory 280 is a dynamic RAM. The microcomputer 500 controls the overall operation of the digital video disk reproducing apparatus as a device control unit, and controls error correction by inputting error detection information. The demodulator 210 demodulates the information formatted in the pulse waveform, that is, the data stream EFS, in units of symbols each consisting of predetermined bits, and outputs the information. Typically, digital video discs perform Eight to Sixteen Modulation when writing data to a disc. The error correction unit 230 performs error correction on a predetermined block made up of data read from the disk. Under the control of the microcomputer 500, the memory controller 270 allocates an appropriate address to the memory 280 and provides the corresponding demodulated data to form an error correction block. The error correction block is composed of data for 16 sectors. The memory 280 also buffers data between the error correction in the two directions and stores the corrected data. The disk drive control unit 400 is controlled by the microcomputer 400 to perform various operations such as rotation and seek of the disk.

FIG. 2 is a flowchart showing an error correction control process of a conventional digital video disk reproducing apparatus. The operation of each step according to the configuration of FIG. 1 will be described in detail as follows.

When the error correction unit 230 corrects the error for one error correction block, the microcomputer 500 issues an error correction completion interrupt. Therefore, the microcomputer 500 checks whether an error has occurred in step (2a). This check may be performed by checking the error flag EF transmitted from the error corrector 230 to the microcomputer 500. If an error has occurred as a result of the check, the process proceeds to step (2b) and checks whether a re-seek flag is set. If the re-seek flag is set, the process proceeds to step (2d) to perform a seek operation again, and then instructs the disk drive controller 400 to seek a disk so that error correction may be performed for the block. On the other hand, if the resync flag is not set, the process proceeds to step (2c) to skip the current block from the memory 280 and issue a skip command to the memory controller 270 to read the next block. As a result, error correction for the next block is performed.

However, it is very unreasonable in many respects to not correct the error-correcting block by only one error correction, or to re-error-correct the block after necessarily re-seeking.

The main problem is that it takes a long time for error correction. This means that the burden on the error correction operation is relatively increased in relation to other operations in the viewpoint of the master controller controlling the digital video reproducing apparatus . In fact, the data in which an error occurred in a block is extremely partial. If the cause of the error is not in seek, it is not necessary to reschedule the error correction every time the error correction is repeated.

On the other hand, in some cases, even if it is repetitiously corrected for a predetermined number of times or more, correction can not be made. In the past, there has been no need for appropriate judgment and appropriate measures.

It is therefore an object of the present invention to provide an apparatus and method for reducing unnecessary time for error correction.

According to another aspect of the present invention, there is provided an apparatus and method for controlling an error correction of a digital video disk reproducing apparatus, comprising the steps of: determining whether or not an error has been corrected; determining if the error has been corrected; Determining whether a re-seek is made if the iterative correction is determined; and if the re-seek is determined to be the re-seek, determining that the error correction is performed again in the current error correction block after the re-seek, Performing error correction again on the current error correction block if the error correction is not performed; and performing error correction on the next error correction block when the error is corrected when the error is corrected or when it is determined that the iterative correction is impossible .

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

In the drawings, the same reference numerals are used for the same reference numerals even though they are shown in different drawings. In the following description, numerous specific details such as specific circuit components are shown. It is to be understood that the same is by way of illustration and example only and is not to be taken by way of limitation, And will be apparent to those of ordinary skill in the art. In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

FIG. 3 shows a partial configuration of a digital video disk reproducing apparatus according to an embodiment of the present invention. The memory 280 is a dynamic RAM. The microcomputer 500 controls the overall operation of the digital video disk reproducing apparatus as a device control unit, and controls error correction by inputting error detection information. The demodulator 210 demodulates the information formatted in the pulse waveform, that is, the data stream EFS, in units of symbols each consisting of predetermined bits, and outputs the information. Typically, digital video discs perform Eight to Sixteen Modulation when writing data to a disc. The error correction unit 230 performs error correction on a predetermined block made up of data read from the disk. For example, the error correction may be performed in the horizontal direction and the vertical direction, and the shapes thereof may be respectively (182, 172, 11), (208, 192, 17). That is, the lengths of the codewords are 182 and 208, the main data excluding the parity is 172 and 192, and the codeword intervals are 11 and 17, respectively.

Under the control of the microcomputer 500, the memory controller 270 allocates an appropriate address to the memory 280 and provides the corresponding demodulated data to form an error correction block. The error correction block is composed of data for 16 sectors. The memory 280 also buffers data between the error correction in the two directions and stores the corrected data. The disk drive control unit 400 is controlled by the microcomputer 400 to perform various operations such as rotation and seek of the disk.

FIG. 4 is a flowchart illustrating an error correction control process of the digital video disk reproducing apparatus according to an embodiment of the present invention. The operation of each step according to the configuration of FIG. 3 will be described in detail as follows.

When the error correction unit 230 corrects the error for one error correction block, the microcomputer 500 issues an error correction completion interrupt. Therefore, the microcomputer 500 checks whether an error has occurred in step (4a). This check may be performed by checking the error flag EF transmitted from the error corrector 230 to the microcomputer 500. If an error has occurred as a result of the check, the process proceeds to step (4b) and checks the remaining capacity of the memory. This information is determined by the memory control unit 270 according to the occurrence status of the address. In other words, if the first address is subtracted from the most recently allocated address, the degree of use of the memory can be grasped, so that the remaining amount of the memory can be grasped. Next, in step (4c), it is checked whether or not it is repeatedly corrected. This is for confirming whether or not the memory remaining amount check result is sufficient for the remaining amount to perform repetitive correction. When it is determined that the remaining amount is sufficient, it is checked whether or not the reshick flag is set. If the re-seek flag is set, the process proceeds to step 4e to set the seek control mode to perform a seek operation again. Then, the disk drive controller 400 controls the seek operation of the disk . On the other hand, if the resync flag is not set, the process proceeds to step (4f) to set a mode for controlling the current block to be corrected again.

On the other hand, if an error does not occur as a result of checking whether or not an error has occurred in step (4a), or if it is difficult to repeatedly correct due to insufficient remaining amount as a result of the repetition correction check in step (4c), a skip mode is set. That is, skips the current block from the memory 280 and issues a steep command to the memory controller 270 to read the next block. As a result, error correction for the next block is performed.

FIG. 5 is a waveform diagram of signals generated in an error correction control process according to an embodiment of the present invention. In FIG. 5, reference numeral 5a denotes an error correction completion interrupt signal, reference numeral 5b denotes an error flag signal, (5d) is a seek signal, and (5e) is a correction block. (t1) is a case where there is an error, but there is no repetitive correction or seek instruction, and the error correction block is moved to the next error correction block as it is. (t2) is a case of performing an iterative correction due to an error, and error correction is performed again in the current error correction block. (t3) is a case in which there is an error and it is judged that even if the iterative correction is performed, it is uncorrectable and the seek is resumed, and the error correction is performed again in the current error correction block after the seek.

The present invention as described above can reduce the unnecessary time required for error correction by repetitively correcting a predetermined number of times or more and correcting the error by a predetermined number of times, . In addition, it is possible to reduce unnecessary time required for error correction by repeatedly correcting by a predetermined number of times with one seek and re-seeking only when no correction is made.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments, but is capable of various modifications within the scope of the invention. Therefore, the scope of the present invention should not be limited by the described embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

Claims (4)

An error correction control apparatus for a digital video disk reproducing apparatus, comprising: a memory for error correction and a data buffer; and a determination unit for determining whether the error correction is repeated or re-seqed according to predetermined error detection information, A demodulator for demodulating and outputting the information read from the disk in units of symbols made up of predetermined bits and outputting the demodulated information; an error correction unit for performing error correction on the predetermined error correction block, A memory controller for allocating an appropriate address to the memory under the control of the host controller and forming the error correction block by storing and reading the demodulated data; A disk drive which performs various operations such as rotation and seek of the disk under the control of the control unit And a drive control unit. The apparatus of claim 1, wherein the error correction unit corrects errors in the horizontal and vertical directions of the error correction block, and the memory buffers data between the error correction of the two directions and stores the corrected data. . The apparatus of claim 1, wherein the main controller controls the overall operation of the digital video disk player. A method for controlling an error correction of a digital video disk reproducing apparatus, comprising the steps of: determining whether an error has been corrected; determining if the error has been corrected; determining whether the error is corrected; And if it is set to reshick as a result of the determination, error correction is performed again in the current error correction block after reshack, and if not set to reshack, error correction is again performed in the current error correction block And performing error correction on the next error correction block when the error is corrected when the error is corrected or when the iterative correction is not possible.