KR100214310B1 - Defect sector data processing method for recording and playback of digital video discs - Google Patents

Abstract

The technical field to which the invention described in the claims belongs.

The present invention relates to a method of processing a defect sector in reproduction of a digital video disc capable of recording and reproducing.

I. The technical problem that the invention is trying to solve

The present invention relates to a method for processing a defect sector during reproduction of a digital video disc capable of recording and reproducing in a digital video disc reproducing apparatus.

All. Summary of Solution of the Invention

Data of a physical sector address having a defect flag set to a logical level meaning a defect sector by using the defect flag synchronized with the physical sector address transmitted from the microcomputer is not written to the memory for error correction.

la. Important uses of the invention

Used when playing back a digital video disc that can be recorded and played back.

Description

Defect sector data processing method for recording and playback of digital video discs

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recordable digital video disk system, and more particularly, to a data processing method of a defect sector present in a recordable digital video disk.

In general, there is an area in the digital video disc that can be recorded and reproduced which cannot be recorded due to physical reasons. This area is called a defect area. This defect area is an empty space without any information and has a minimum unit of one data sector. Therefore, the data input to the error correction memory when playing a digital video disc capable of recording and reproducing is controlled in sector units. The error correction memory is a memory for temporarily storing data for correcting an error of data read on a digital video disc capable of recording and reproducing. In a digital video disc reproducing apparatus capable of recording and reproducing, error correction is performed on a basis of 16 data sectors. Store in memory and perform error correction. The sixteen data sectors recorded in the error correction memory are consecutive. This is because, since 16 data sectors in which error correction parity is generated is a basic unit, if 16 data sectors are not continuous, error correction is of no use. Therefore, if a defect sector exists among the 16 data sectors, the next normal data sector has been recorded in the error correction memory without writing this area in the error correction memory.

FIG. 1 shows a data storage structure of a digital video disc capable of recording and reproducing, and it can be seen that a physical sector address is recorded in advance, and data to be corrected in error is recorded after the physical sector address. .

FIG. 2 is a block diagram of a system decoder 230 of a conventional video reproducing apparatus capable of recording and reproducing to which the present invention is applied. Referring to FIG. 2, the memory 224 is an error correcting memory for 16 data sectors. The data is stored in units and the defect list is stored separately. The microcomputer interface unit 226 interfaces data input / output between the microcomputer 228 and the respective units of the system decoder 230. The microcomputer 228 is a device controller which controls the overall operation of the digital video disk player. The microcomputer 228 also controls the overall operation of the system decoder 230. When the disc 200 is played back, the disc motor 204 starts to rotate at a certain speed, and in the optical pickup 202 having a head, the disc information is converted into an analog high frequency signal and output. The signal is shaped into a pulse waveform so that the data stream (EFM) is input to the 32-bit shift register 206 and the lower 16 bits of the 32-bit output of the 32-bit shift register 206 are transmitted to the 16-8 demodulator 208. do. The 16-8 demodulator 208 converts the input 16-bit data into 8 bits of one symbol and outputs the converted data. This is because 8-16 modulations were made when data was written to disk. The physical sector address detector 230 detects a physical sector address among data applied from the 16-8 demodulator 208. The physical sector address error correction unit 234 performs error correction on the physical sector address applied from the physical sector address detection unit 230. The data sector address detection and error correction unit 232 detects the data sector address and corrects the error. The synchronization detecting unit 210 detects frame synchronization, which is a standard signal for controlling the rotation of the disk 200, sector synchronization for sector division, and error correction time, so that the data in the error correction block can be read. Various synchronization patterns such as correction synchronization are detected to generate a signal. The descrambler 214 restores the scrambled data to the original data before recording to a digital video disc capable of recording and reproducing. The error detector 216 detects an error included in data output from the descrambler 214. The deinterleave 218 reduces the data interleaved on a frame-by-frame basis to the original array by controlling the write / read address of the memory. The interface unit 222 is responsible for interfacing the system decoder 230 with the audio / video decoder. The memory controller 220 checks the defect flag synchronized with the physical sector address and the physical sector address transmitted from the microcomputer 228 and selectively writes the defect flag in the memory 224. The error correction unit 212 corrects a predetermined block made of data read from a digital video disc capable of recording and reproducing.

Fig. 3 shows a data processing flow of checking whether a data sector input on a conventionally recordable digital video disc is a defect sector and writing it to the error correction memory only when it is not a defect sector.

First, the microcomputer 228 reads the defect list from the read-in area on the digital video disc capable of recording and reproducing in step 300, and proceeds to step 302 to store the defect list in the defect management memory. Next, the microcomputer 228 moves the optical pickup to a desired position on the digital video disk capable of recording and reproducing in step 304, and checks the physical sector address input from the optical pickup 202 in step 306 to determine whether it is the desired data. Examine whether or not. If the desired physical sector address is found in step 306, the microcomputer 228 proceeds to step 308 to check whether the physical sector address is in the defect list. If the physical sector address is in the defect list, the microcomputer 228 proceeds to step 310 so that the data sector including the physical sector address is not written to the error correction memory 224. In contrast, if the physical sector address is not in the defect list, the microcomputer 228 proceeds to step 312 and records the data sector including the physical sector address in the error correction memory 224.

As described above, in order to check whether the input data sector is a defect sector, the physical sector address of the input sector has to be continuously compared with the entire defect list. Therefore, when there are many defect lists, there is a problem in that it takes a long time to compare the physical sector address of the input sector with the defect list, resulting in a time delay in writing the data sector to the error correction memory.

As described above, since the physical sector addresses of the input data sectors have to be continuously compared with the defect list, when the defect list is large, the time taken to compare the physical sector addresses and the defect list of the input data sectors is increased. There was a delay in writing data sectors to the memory for error correction.

Accordingly, it is an object of the present invention to provide a processing method for reducing the time delay for writing an input data sector into an error correction memory.

1 is a data configuration diagram of a digital video disc capable of recording and reproducing;

2 is a block diagram showing an internal configuration of a system decoder of a conventional digital video disc player;

3 is a flowchart of data processing in reproducing a digital video disc capable of conventional recording and reproducing;

4 and 5 are flowcharts of data processing during reproduction of a digital video disc capable of recording and reproducing according to an embodiment of the present invention.

In order to achieve the above object, the present invention provides a Defect Flag, which is information used as a basis for determining whether a starting physical sector address of a data sector to be read by a microcomputer and a sector synchronized to the physical sector address is defective. Is applied to the memory control unit. Then, when the physical sector address specified by the microcomputer is input from the disk, the memory controller records only the undefected data sectors in the error correction memory with reference to the synchronized defect flag.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Many specific details are set forth in the following description and in the accompanying drawings to provide a more general understanding of the invention. It will be apparent to those skilled in the art that the present invention may be practiced without these specific details. And a detailed description of known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

4 shows a process flow diagram in a microcomputer 228 according to an embodiment of the present invention. An embodiment of the present invention will now be described in detail with reference to FIGS. 2 and 4.

First, when a digital video disc capable of recording and reproducing is newly loaded, the microcomputer 228 reads lead-in having various information about the digital video disc capable of recording and reproducing in step 400 of FIG. 4. The defect list is read from the area, and the process proceeds to step 402 to record the defect list in the defect management memory. The defect management memory refers to a memory partially allocated for storing a defect list in the memory 224 of FIG. 2. The microcomputer 228 proceeds to step 404 to designate the physical sector address to be read. The microcomputer 228 proceeds to step 406 to check whether the physical sector address specified in step 404 is in the defect list by referring to the defect list stored in the defect management memory. If the physical sector address is in the defect list in step 406, the microcomputer 228 proceeds to step 408 to store the defect flag set to a logic level high in synchronization with the physical sector address and the physical sector address. To send). On the contrary, if the physical sector address is not in the defect list in step 406, the microcomputer 228 proceeds to step 410 in which the defect flag is set to a logic level low in synchronization with the physical sector address and the physical sector address. Send to 220.

FIG. 5 illustrates a data processing flow in the memory controller 220 which receives the physical sector address transmitted from the microcomputer 228 and the defect flag synchronized with the physical sector address in the processing flow of FIG. 4. 2 and 5, the memory controller 220 receives the physical sector address and the defect flag transmitted from the microcomputer 228 in operation 500. In step 502, the memory controller 220 checks the physical sector address input on the digital video disc that can be recorded and reproduced by the optical pickup 202, and proceeds to step 504 to input the data in step 502. It is checked whether the physical sector address and the physical sector address transmitted from the microcomputer 228 are the same. If the two physical sector addresses are not the same in step 504, the memory controller 220 returns to step 502 and performs steps 502 to 504 again. In contrast, if the two physical sector addresses are the same in step 504, the memory controller 220 proceeds to step 506 to check whether the defect flag is at a logic level high. If the defect flag is at the logic level in step 506, the memory controller 220 proceeds to step 508 and does not write the physical sector address to the memory 224. In contrast, if the defect flag is at a logic level low in step 506, the memory controller 220 proceeds to step 510 and writes a physical sector address into the memory 224.

Therefore, the memory controller receiving the defect flag synchronized with the physical sector address and the physical sector address from the microcomputer checks the logic level of the defect flag and writes the physical sector address into the error correction memory to continuously decode the physical sector address. Because of the comparison with the fact list, it is possible to prevent the time lag that occurred in the memory recording control that occurred.

As described above, according to the present invention, the memory controller receiving the defect flag synchronized with the physical sector address from the microcomputer checks the logic level of the defect flag and selectively writes the physical sector address into the error correction memory. There is an advantage that it is possible to prevent the time delay that is taken during correction memory write control.

Claims (1)

In the method of processing the defect sector data when playing a digital video disk capable of recording and playback in a digital video disk playback apparatus, Reading a defect list from a lead-in area on a digital video disc capable of recording and reproducing and storing it in a memory; Specifying a physical sector address to read; Generating a defect flag synchronized with the physical sector address by checking whether the physical sector address is a defect list stored in the memory; Checking whether the physical sector address input and optically picked up from the digital video disc capable of recording and reproducing is the same as the designated physical sector address; Checking defect flags synchronized with the specified physical sector address if the two physical sector addresses are the same; And storing data of the optically picked-up physical sector address in the memory for error correction only when the synchronized defect flag is at a logic level meaning that the designated physical sector address is not defective. A method of processing defect sector data when playing a digital video disc.

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