Patent ID: 8059510

Claim:
An information reproducing device for receiving asynchronous sample at an asynchronous sampling clock asynchronous with a recording timing of data recorded in a recording medium and performing Viterbi decoding with respect to an input signal, the device comprising: a reference value generating circuit for receiving basic reference values at a predetermined reference phase, and generating reference values for Viterbi decoding based on the basic reference values, at a phase of the asynchronous sampling clock where the recording timing of the record data is a reference point; a Viterbi decoding circuit for performing maximum likelihood decoding based on the reference values generated by the reference value generating circuit and the input signal; and a basic reference value learning circuit for learning and modifying the basic reference values based on errors between the reference values at the phase of the asynchronous sampling clock generated by the reference value generating circuit and the input signal, and the phase of the asynchronous sampling clock.