Patent ID: 6987719

Claim:
An optical disk device comprising: drive means for driving in rotation an optical disk having a wobbled track; irradiating means for irradiating a light beam onto the optical disk; light receiving means for receiving the light reflected from the optical disk and outputting an electric signal corresponding to the reflected light; and wobble signal reproducing means for reproducing, from the output electric signal of the light receiving means, a wobble signal corresponding to a wobble of the track, said wobble signal reproducing means including: (a) detection means for detecting a center frequency of the wobble signal including: (i) a band-pass filter having a pass band being set to pass the wobble signal within a range of driving in rotation of the optical disk by said drive means, and (ii) a frequency detection means for detecting a frequency of the wobble signal which has passed through said band-pass filter, and (b) extracting means for extracting the wobble signal from the output electric signal on the basis of the frequency detected by said frequency detection means.