Disk read-out circuit employing separate servo data and information data filters

摘要

A circuit for reading out data written on a disk filters respective frequencies of data of different bands. The circuit has a filter unit (24) consisting of a plurality of filters each corresponding to the frequency of a different band and a filter selection controller (25) for controlling the frequency supplied to the filter unit (24) to thereby filter with respect to the frequencies of different bands. Thus, high density data can be written on the disk, and filtering of the data is optimized, so that the signal quality of the disk read-out circuit is enhanced.