Patent ID: 7564750

Claim:
A reproducing apparatus comprising: a reading unit configured to apply an optical beam to a track which is formed on a disk recording medium and wobbles at a predetermined cycle and to generate a wobbling signal containing a frequency component associated with the wobbling cycle of the track and a reproduced signal containing information data recorded on the track; a clock generation unit configured to generate a clock having a frequency associated with the wobbling cycle using the wobbling signal, the clock generation unit including a reference signal generation unit configured to generate a reference cycle signal of the frequency associated with the wobbling cycle, a detection unit configured to detect a frequency difference between the reference cycle signal and the wobbling signal, a sine wave signal generation unit configured to generate a sine wave signal based on an output of the detection unit, and a multiplication unit configured to multiply a frequency of the sine wave signal to generate the clock; and a control unit configured to detect a phase difference between the reproduced signal and the clock, and to control a generation operation of the clock generation unit using the phase difference, the control unit changing a phase of the reference cycle signal and a phase of the sine wave signal based on the phase difference.