Information reproducing apparatus and reproducing method

摘要

In a magneto-optic disc apparatus corresponding to six-value four-status Viterbi decoding method, an RAA (101) has 12 registers so as to separately adapt amplitude reference values for an address portion and amplitude reference values for a data portion on a magneto-optic disc. Normally, stored values of the registers at the time a reproducing operation has been just completed are used for initial values for an adapting process in the next reproducing operation. On the other hand, when data cannot be correctly reproduced and thereby a read-retry operation or the like is performed, predetermined values that are stored in 12 registers in the RAA (101) are used as initial values. In this case, the adapting process for amplitude reference values is not performed.