1. A bit converter between an upstream decoder and a downstream decoder, comprising: a substitution module configured to substitute a decision result from the upstream decoder representing a bit string of a predetermined pattern based on a substitution rule for converting the bit string of the predetermined pattern into a predetermined correct code word, the predetermined pattern being used for inspection and having a pattern that cannot be converted into the predetermined correct code word by the downstream decoder; and an output module configured to output the decision result from the upstream decoder as substituted by the substitution module, to the downstream decoder.
1. A bit converter between an upstream decoder and a downstream decoder, comprising: a substitution module configured to substitute a decision result from the upstream decoder representing a bit string of a predetermined pattern based on a substitution rule for converting the bit string of the predetermined pattern into a predetermined correct code word, the predetermined pattern being used for inspection and having a pattern that cannot be converted into the predetermined correct code word by the downstream decoder; and an output module configured to output the decision result from the upstream decoder as substituted by the substitution module, to the downstream decoder. 2. The bit converter according to claim 1 , wherein the decision result indicates a log likelihood ratio of â€œ0â€ and â€œ1â€ for each bit of the bit string represented thereby.