Signal processing method of wobble signal, recording and reproducing method of optical disc, optical disc apparatus, program, and recording medium

Abstract

In a method of and an apparatus for creating a reproduced wobble signal by subtracting an estimated crosstalk signal, expressed by a sine waveform having a frequency approximately equal to the meandering frequency of grooves, from an original wobble signal and recording or reproducing an information pattern at a predetermined position of an optical disc, a carrier signal, which is caused to correspond to the meandering of the groove by being subjected to phase synchronization, is assumed based on the reproduced wobble signal, a crosstalk remaining component is estimated from the amplitude and phase of the region, which meanders in approximately the same phase as the estimated carrier signal in the reproduced wobble signal, and from the amplitude and phase of the region which meanders according to a signal different from the estimated carrier signal, and the estimated crosstalk is updated to cancel the remaining component.