| 摘要 |
PURPOSE:To simplify the constitution by equalizing the number of words included in the first sequence of an error correction code and that in the second sequence to share an encoder or decoder between these two sequences. CONSTITUTION:In two linear codes, namely, (n1, k1) code and (n2, k2) code, k1 and n1 are equalized to k2 and n2 respectively for the purpose of equalizing the number of words in the first sequence of the error correction code and that in the second sequence. In case of 512-byte information, k1 and k2 are set to 23, and n1 and n2 are set to 27, and a lead Solomon code (27, 23) is used as the first and second correction codes. A 12-byte header and a 4-byte CRC, namely 16 bytes are added to 512 bytes of information because information points have a 529 (23X23)-byte capacity, and one bit of '0' is added, and 529 bytes are obtained as the whole. Error correction codes C1- and C2- are added to them to obtain 27X27 bytes.
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