An optical disk drive apparatus is provided has a reading section which
reads the reflection of a laser beam from a disk to produce a read
signal, a filter section which filters the read signal with the use of
three or more different cutoff frequencies upon receiving a control
signal from a two or more bits control line, a reproducing section which
playbacks the read signal filtered by the filter, and a control section
which provides the filter with the control signal along the two or more
bits control line so that the filtering action with the three or more
different cutoff frequencies of the filter is carried out throughout
three or more consecutive periods respectively.