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Method and device for correcting code and character error by using detected error position

An error and code word technology, applied in the field of correction of errors and deletions in modulation channel data, can solve the problems of increasing the number of deletions and reducing the actual efficiency of error correction

Inactive Publication Date: 2005-08-03
SAMSUNG ELECTRONICS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the limiter outputs 14 bits (in the case of CD) or 16 bits (in the case of DVD) to form a symbol, using the soft processing method in the limiter will increase the number of deletions
The result is that the actual efficiency of error correction is reduced to a lower

Method used

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  • Method and device for correcting code and character error by using detected error position
  • Method and device for correcting code and character error by using detected error position
  • Method and device for correcting code and character error by using detected error position

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Embodiment Construction

[0028] Before describing a preferred embodiment of the present invention, a conventional system for error correction used in a CD system will be described with reference to FIG. 1 .

[0029]In FIG. 1, EFM decoder 11 receives EFM modulated channel data reproduced from a CD, and has an internal look-up table of EFM codes. The EFM code determines 256 channel data patterns (CH-D) that a channel data symbol (CH-D) can have, and 8-bit information data symbols corresponding to the respective channel pattern. If there is the channel data type corresponding to the 14-bit channel data symbol (CH-D) of the EFM modulation channel data, the EFM decoder 11 selects the 8-bit information data symbol corresponding to the channel data type as the EFM demodulation data symbol (EFM-D) D).

[0030] If there is no channel data type corresponding to the channel data symbol (CH-D) in the EFM code, the EFM decoder 11 selects any information data symbol in the EFM code as the EFM demodulation data sym...

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Abstract

A method and system for error correcting C1 / PI words using error locations detected by EFM / EFM+ decoder are provided. The method for channel decoding and error correcting includes: (a) setting up a channel code; (b) producing demodulated data including information data symbols and erasure flags by modulating channel data symbols, using the channel code; and (c) performing an error-erasure correction on the information data symbols of the demodulated data, using error locations indicated by the erasure flags. The system for channel decoding and error correcting includes a channel decoder, a memory and a decoding unit.

Description

technical field [0001] The present invention relates to error erasure correction of reproduced data from an optical disc device, and more particularly, to a method and apparatus for correcting errors and erasures in modulated channel data by displaying error positions while demodulating modulated channel data. Background technique [0002] Optical disks, such as compact disks (CDs) or digital video disks (DVDs), are used to store large amounts of audiovisual and / or other data information. When such information is recorded on and read from an optical disc, noise may be generated. In order to correct errors due to noise, in the DVD system, Reed-Solomon (Reed-Solomon) (R-S) product codes are used as error correction codes, R-S product codes include (182, 172, 11) inner code (PI) And the outer code (PO) of (208,192,17). Here, "182" of the inner code and "208" of the outer code represent the length of the codeword, that is, the number of symbols forming the codeword. "172" of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B20/18H03M7/14
CPCG11B20/1833G11B20/1866H03M13/00
Inventor 权亨俊
Owner SAMSUNG ELECTRONICS CO LTD
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