WOBBLE SIGNAL DEMODULATION METHOD, WOBBLE SIGNAL DEMODULATION CIRCUIT, AND OPTICAL DISC DEVICE

摘要

A wobbling signal demodulation method is disclosed that is capable of fast and precisely demodulating a wobbling signal without increasing cost of the circuit. The wobbling signal is obtained based on light reflected from a recording surface of an optical disk having a wobbling track formed thereon, and includes a carrier portion having a predetermined basic period and a phase demodulated wave portion including predetermined information. The wobbling signal demodulation method includes 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 a first integration result corresponding to the first half of the basic period and 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.