Patent ID: 7173890

Claim:
A wobbling signal demodulation method for demodulating a wobbling signal obtained based on light reflected from a recording surface of an optical disk having a wobbling track formed thereon, said wobbling signal including a carrier portion having a predetermined basic period and a phase demodulated wave portion including predetermined information, said wobbling signal demodulation method comprising: a first step of respectively integrating a portion of the wobbling signal corresponding to a first half of the basic period and a portion of the wobbling signal corresponding to a second half of the basic period in synchronization with a clock signal generated from the carrier portion; a second step of generating a digital signal based on at least one digital value related to a first integration result corresponding to the first half of the basic period and at least one digital value related to a second integration result corresponding to the second half of the basic period; and a third step of performing a phase demodulation on the phase demodulated wave portion of the wobbling signal based on the digital signal and the clock signal.