Error correction method and apparatus on optical disc system

Details Error correction method and apparatus on optical disc system Error correction method and apparatus on optical disc system

1996-02-08

1998-03-24

Baker, Stephen M.

Excavating

371 4014, G11B 2018

Patent

active

057320934

ABSTRACT:
An error correction method and apparatus for optical disc systems, capable of performing error correction procedures selectively according to the type of optical disc being used, such as CD-DA and CD-ROM, either of which can be used interchangeably in the system. In the method, the first step is to receive old data sequences and old erasure pointers associated with the old data sequences from the optical disc drive. The second step is to decode the old data sequences and the associated erasure pointers so as to generate new data sequences and a set of erasure pointer modification parameters. In the final step, a number of erasure pointers to be associated with the new data sequences are determined based on the set of erasure pointer modification parameters, and by using a first transform method if a first type of optical disc such as CD-DA is being read and a second transform method if a second type of optical disc such as CD-ROM is being read. In the apparatus, a decoding circuit is used to perform the aforementioned first step; a logic mapping transform circuit is coupled to the decoding circuit and used for performing the aforementioned second step. Moreover, a multiplexer is used to select the output of the logic mapping transform circuit or the old erasure pointers as output of the apparatus.

REFERENCES:
patent: 4413340 (1983-11-01), Odaka et al.
patent: 4677622 (1987-06-01), Okamoto et al.
patent: 5060221 (1991-10-01), Sako et al.

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