| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a data decoding apparatus, a data reproducing apparatus, and a data decoding method to correct data by using both the LDPC decoding and decoding using the parity restriction. Ž<P>SOLUTION: The data decoding device includes: a check matrix including a submatrix which indicates a parity restriction and used for LDPC decoding; a first decoding module configured to decode data by using the submatrix so that the parity restriction is satisfied; and a second decoding module configured to LDPC-decode the decoded data by using the check matrix. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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