Patent ID: 6594210
Filing Date: 2003-07-15
Classification: G11B

Abstract:
A disc drive apparatus capable of recording or reproducing a disc recording medium on which recording tracks are formed using grooves, comprising:light detecting means capable of obtaining a first push-pull signal from reflected light from a main spot of laser light and obtaining second and third push-pull signals from reflected light from two side spots of the laser light; a wobble component signal extractor for extracting wobble component signals in a recording track under a scan using the first push-pull signal; a crosstalk component signal generator for generating crosstalk component signals from adjacent tracks on both sides of the recording track using the second and third push-pull signals; and a wobble information output unit for generating wobble information of the recording track from signals obtained by canceling the crosstalk component signals in the wobble component signals and for outputting the wobble information.