Error correction code encoder

Details Error correction code encoder Error correction code encoder

1987-05-07

1989-08-08

Smith, Jerry

Excavating

G06F 1110

Patent

active

048560030

ABSTRACT:
An encoder encodes a sector of data to produce ECC symbols using a GF(2.sup.10) code by first appending one or more pseudo data bytes to the sector data bytes. The data string of sector data bytes and pseudo data bytes are then encoded to produce a desired number of 10-bit ECC symbols. Two selected bits from each ECC symbol are compared to a known bit pattern. If the selected bits match the pattern, the bits are truncated and the remaining 8-bit symbols are concatenated with the data string to form a codeword. The codeword bytes can later be decoded, and any error correction performed, by appending the bit pattern as necessary. If the selected bits do not match the pattern, the pseudo data bytes are modified such that encoding the data bytes and the modified pseudo data bytes produce 10-bit ECC symbols with the selected bits matching the bit pattern. The selected bits are then truncated and the remaining 8-bit symbols are concatenated with the data string to form the code-word.

REFERENCES:
patent: 4500926 (1985-02-01), Yoshimaru
patent: 4623999 (1986-11-01), Patterson
patent: 4683571 (1987-07-01), Yamagishi
patent: 4703485 (1987-10-01), Patel

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