Method of and apparatus for regenerating partial-response record signal

Abstract

Disclosed are a partial-response record signal regenerating method of and an apparatus for regenerating a record signal of a data area which is read from a storage disc by use of an equalizing circuit after training a circuit constant of said equalizing circuit with a training signal of the record signal read from the storage disc. The record signal regenerating method comprises: a Viterbi decode step of Viterbi-decoding an output into which the record signal is equalized by the equalizing circuit; a decode step of converting an m-bit output which is Viterbi-decoded into n-bits (m>n); and a synchronism detecting step of detecting the training signal from the m-bit output which is Viterbi-decoded and indicating a start of decoding the record signal of the data area. The record signal regenerating apparatus comprises: an equalizing circuit for equalizing the record signal by use of its circuit constant trained by a training signal recorded in front of a data area on the storage disc; a Viterbi decode circuit for Viterbi-decoding an output of the equalizing circuit; a decoder for converting an m-bit output which is Viterbi-decoded into n-bits (m>n); and a synchronism detecting circuit for indicating a start of decoding of the decoder by detecting the training signal from the Viterbi-decoded m-bit output.