RUN LENGTH RESTRICTED CODING AND DECODING USING RIGID RESYNCHRONIZATION

摘要

PROBLEM TO BE SOLVED: To provide a rigid resynchronization pattern included in an RLL coding data by coding and decoding a run length restricted code, generating the rigid resynchronization pattern to put it into a channel bit stream and restoring the resynchronization pattern from an RLL coding bit stream. SOLUTION: A resynchronization generating mechanism 55 supplies a rigid resynchronization pattern which is put into a channel data bit stream by a write formatter 25. The resynchronization pattern is strengthened, when the RLL coding is carried out by an encoder 11 which excludes a specific pattern as a code word. A bit shift operation is applied to the resynchronization pattern to shift its head transition to its end transition, so that the pattern will not exceed the (k) restriction. Then the bit shift patterns are excluded from the code words which are generated by the encoder 11.