OPTICAL DISK UNIT

摘要

An optical disk unit used for reproducing digital data recorded on an optical disk, the unit comprising a transversal filter (6) for performing partial response equalization on a signal reproduced from an optical recording medium (52) where address information-recorded address blocks and data blocks as recordable regions exist, and a by-block filter coefficient learning means (7) for suitably learning a filter coefficient of a transversal filter (6) on a block basis so as to minimize its equalizing error on the basis of an output signal of partial response equalizing, thereby reducing difference in reproducing characteristics among reproduction blocks and improving readability with respect to an optical disk medium.