Patent ID: 7075867

Claim:
An optical disc controller for use in an optical disc drive that plays optically a first information storage medium and a second information storage medium having a higher storage density than that of the first information storage medium, the optical disc controller comprising: a rotation control section for controlling a rotating mechanism that rotates the first and second information storage media; an equalizer for removing first frequency range components from an RF playback signal, obtained by irradiating each of the first and second information storage media with light and detecting light reflected therefrom, and for amplifying the amplitude of second frequency range components thereof; and a phase locking section for generating a sync clock signal to do synchronization detection with respect to a digital playback signal that is obtained by digitizing the output of the equalizer, wherein the rotation control section rotates the first and second information storage media while controlling the rotating mechanism such that RF playback signals are obtained at a first transfer rate and at a second transfer rate, respectively, and wherein the maximum playback frequency of the RF playback signal obtained from the first information storage medium at the first transfer rate is substantially equal to that of the RF playback signal obtained from the second information storage medium at the second transfer rate.