Disk-reproduced signal equalizer for use in constant wave length-constant angular velocity scheme

A disk-reproduced signal equalizer for processing a disk-reproduced signal comprising:

• a plurality of pairs of delay means arranged in correspondence with a plurality of divided track areas on a disk and respectively having delay characteristics for each track area, with respect to a reproduced signal input from a disk recording/reproducing apparatus of a constant wave length-constant angular velocity scheme of performing a recording/reproducing operation at a substantially constant recording wave length by changing a clock frequency in accordance with a track position while keeping a rotational speed of the disk constant, each of said delay means having a plurality of output taps;
• selection means for selecting one pair of said plurality of pairs of delay means on the basis of information supplied from said disk recording/reproducing apparatus and indicating a track position;
• and
• differential amplifier means for receiving outputs from a plurality of output taps of said one pair of delay means selected from said plurality of pairs of delay means, and performing predetermined equalization processing, whereby the disk-reproduced signal is processed to obtain a desired, optimized equalization characteristic.