G - Physics – 11 – B
Patent
G - Physics
11
B
354/223
G11B 20/18 (2006.01) H03M 13/00 (2006.01) H03M 13/29 (2006.01)
Patent
CA 1217868
ABSTRACT The present invention provides apparatus for detecting and correcting errors in product codes of minimum distance 2t, with t being a positive integer, wherein, with respect to information of (kx?) symbols arranged in a matrix with k rows and ? columns, with k and ? being positive integers, in each of k rows a checksum symbol is added constituting codes with minimum distance 2 to ?, and in each of (?+1) columns including a column for said added checksum symbols, a set of parity check symbols are added constituting codes of minimum distance to k symbols. The apparatus performs a first decoding of (?+1) codes in column-direction by means of a first decoder, then decides the decoding mode among three decoding modes by statistical processing of the error number flags issued from the first decoder, and finally performs a second decoding in which, responding to the decided decoding mode, the decoding is made as assertion of simple error detection, or single erasure error correction by using codes in row-direction, or error detection by using codes in row-direction. The system is especially suited for use in parity checking in digital information data transmission or recording, where high speed and reliability are required.
463060
Ichinose Makoto
Kuroki Yuzuru
Satoh Isao
Sugimura Tatuo
Borden Ladner Gervais Llp
Matsushita Electric Industrial Co. Ltd.
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