Patent ID: 7242651

Claim:
A disk playback device wherein a disk is irradiated with a laser beam from an optical head to reproduce signals from the disk, the disk playback device being characterized in that the device comprises: means for producing a reproduction synchronizing signal providing reference timing at which a reproduced signal is detected by reading an output signal from the optical head, means for detecting the reproduced signal by reading the output signal from the optical head based on the reproduction synchronizing signal, means for determining an optimum phase for a normal reproduction operation by altering the phase of the reproduction synchronizing signal and executing a reproduction operation, and phase adjusting means for making a phase adjustment for the reproduction synchronizing signal to be produced by the means for producing a reproduction synchronizing signal based on the optimum phase determined, wherein the optimum phase determining means retrieves as the optimum phase a phase which makes the bit error rate of the reproduced signal minimum not greater than a predetermined threshold value, wherein the phase adjusting means permits a delay time to be changeable to thereby make a phase adjustment for reproduction synchronizing signal based on the determined optimum phase.