Decoder for the decoding of code words which are blockwise prote

Details Decoder for the decoding of code words which are blockwise prote Decoder for the decoding of code words which are blockwise prote

1986-01-30

1987-02-10

Atkinson, Charles E.

Excavating

371 37, G06F 1110

Patent

active

046428089

ABSTRACT:
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 the formation of the syndrome symbols, the key equation is solved, assuming the least possible number of symbol errors. When a plausible number L is found using 2L syndrome symbols, an additional number of syndrome symbols is considered for determining the discrepancy quantity. The locator equation is directly solved when it is of a low order. For a higher order, a Chien search cycle is performed and any symbol error found 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.

REFERENCES:
patent: 3648236 (1972-03-01), Burton
patent: 4142174 (1979-02-01), Chen et al.
patent: 4468769 (1984-08-01), Koga
Clark, Jr. et al., Error-Correction Coding for Digital Communications, Plenum Press, New York, 1981, pp. 188-223.
Berlekamp, Algebraic Coding Theory, McGraw-Hill, 1968, pp. 176-199.

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