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

摘要

A wobble signal demodulation method is disclosed. A wobble signal is acquired according to reflected light from a recording surface of an optical disc where a meandering track is formed. The wobble signal includes a carrier section having a predetermined basic cycle and a phase modulation wave section to which predetermined information is attached. The wobble signal demodulation method includes: a first step for dividing the wobble signal into a first half and a second half of the reference cycle and respectively integrating them in synchronization with a clock signal generated from the carrier section; a second step for generating a digital signal according to at least one digital value corresponding to the integration result of the aforementioned first half and at least one digital value corresponding to the integration result of the aforementioned second half; and a third step for performing phase demodulation of the phase modulation wave section according to the aforementioned digital signal and the clock signal. Thus, it is possible to accurately and rapidly demodulate the wobble signal obtained according to the reflected light from the optical disc recording surface at a reasonable cost.