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Defect detection system and method

A defect detection and defect technology, used in digital signal error detection/correction, disc-shaped record carriers, instruments, etc., can solve problems such as defects in fault-tolerant data blocks

Inactive Publication Date: 2008-04-23
MEDIATEK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, if an outer parity code PO error occurs in more than a certain number of columns in an error-tolerant data block, the error-tolerant data block is also considered to be defective

Method used

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  • Defect detection system and method
  • Defect detection system and method

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Embodiment Construction

[0031] In order to make the above and other objects, features, and advantages of the present invention more comprehensible, the preferred embodiments are specifically listed below, together with the accompanying drawings, and are described in detail as follows:

[0032] FIG. 3 is an embodiment of the DVD-RAM defect management system of the present invention. The demodulator 302 decodes the 8-14 encoded signal (EFM) read from the head (not shown) into a digital data stream as shown in FIG. 2 , and the sector detector 304 receives the digital data stream for sector verification. The digital data stream represents a plurality of consecutive data frames in an error-tolerant data block. An error-tolerant data block (ECC block) includes 16 sectors, and each sector includes 12 data frames (frames), and each data frame is followed by a 10-bit inner check code PI. The sector detector 304 sequentially extracts data frames from the digital data stream, and the defect of each sector is ...

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Abstract

The present invention provides a defect detecting system and method for the reproducible compact disc. In said system, a demodulator reads the content and internal check codes (PI) of a plurality of sectors on a compact disc. A sector detector decodes said internal check codes (PI) to obtain said the defect information of those sectors. A memory stores the ECC block composed of the content of said sectors, and stores the defect information of said sectors, wherein the ECC block contains an external check codes (PO). An ECC block detector decodes said external check codes and judges that if the ECC block has defects according to said defect information of those sectors and said external check code. A processor controls the decoding program of said internal check codes and external check codes.

Description

technical field [0001] The present invention relates to DVD-RAM, in particular to defect management of a DVD-RAM disc, in particular to a defect detection system and method. Background technique [0002] For rewritable optical discs such as DVD-RAM, if the read error of a sector (sector) exceeds a certain standard, the sector is regarded as a defective (defective) sector, and the data is no longer written. into this sector. In practice, for example, the address of the defective sector can be recorded in a defect management table, and the optical drive avoids accessing the sector accordingly. [0003] FIG. 1 is a structural diagram of a sector data block in the existing DVD-RAM specification. A sector contains 2064 bits arranged in 12 columns of 172 bits each. There are three fields at the front of the first column, data identification code (Data ID), identification code error detection (IED) and reserved bits, followed by 160-bit data. The data identification code stores...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B20/18
CPCG11B2220/2537G11B20/1803G11B2020/1826G11B2020/1853
Inventor 朱清和江俊颖
Owner MEDIATEK INC