H - Electricity – 03 – M
Patent
H - Electricity
03
M
354/67
H03M 13/00 (2006.01) G11B 20/18 (2006.01) H03M 13/15 (2006.01)
Patent
CA 1220865
PHN 10 710 -33- 14-5-1984 ABSTRACT: "Decoder for the decoding of code words which are protected against the occurrence of a plurality of symbol errors by means of a Reed-Solomon code. and reading device for op- tically readable record carriers which comprises such a decoder". A description is given of a decoding system for code words which are protected against the occurrence of a plurality of symbol errors within a code word by means of a Reed-Solomon code. After each formation of the syndrome symbols, the key equation is solved, assuming an as small as possible number of symbol errors. When a plausible number L is found using 2L syndrome symbols, an additional number of further syndrome symbols is considered for determining the discrepancy quantity. The locator equation is directly solved when it is of a low order; in the case of a higher order, a Chien search cycle is performed and each time a symbol error is found it is removed by division until the order becomes low enough for direct solution. The decoding system is suitable for implementation by means of a microcomputer and for use in a reading device for optically readable record carriers.
457106
Koninklijke Philips Electronics N.v.
Van Steinburg C.e.
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