Excavating
Patent
1993-10-07
1995-09-12
Gordon, Paul P.
Excavating
371 374, G06F 11101
Patent
active
054504210
ABSTRACT:
A method for correcting multiple erroneous symbols included in data produces a demodulation flag indicating whether demodulation based on a modulation code such as EFM or ETM is possible. The demodulation flag is used in decoding the data based on the error correcting code. Producing the error locations during decoding in accordance with a Reed-Solomon code comprises the steps of producing an index using ##EQU1## provided .sigma..sub.1, .sigma..sub.2 and .sigma..sub.3 represent coefficients of an error location polynomial, k.sub.1 represents .sigma..sub.1.sup.2 +.sigma..sub.2 and k.sub.2 represents .sigma..sub.1 .sigma..sub.2 +.sigma..sub.3, reading out virtual roots from a specified memory related to the index, and transforming the virtual roots (Z.sub.1, Z.sub.2 and Z.sub.3) into error locations (x.sup.j1, x.sup.j2 and x.sup.j3) in accordance with the following equations.
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Joo Tae-shik
Lee Seok-jeong
Brown Thomas E.
Donohoe Charles R.
Gordon Paul P.
Samsung Electronics Co,. Ltd.
Westerlund, Jr. Robert A.
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