Patent ID: 6333902
Filing Date: 2001-12-25
Classification: G11B

Abstract:
A method for generating a land/groove switching signal from pits on a land/groove type disc having tracks with wobbles, in which header information is recorded in sectors of each track, the header information including physical identification data and a peak header and a bottom header distinguished by envelopes of a peak header signal and a bottom header signal, both the peak and bottom header signals having phases corresponding to lands or grooves, comprising the steps of:(a) comparing the phases of the peak header signal and the bottom header signal to determine a track switching point;(b) determining a sequence of sectors using the physical identification data of the disc;(c) counting a number of sectors included in each track based on a number of wobble signal cycles reproduced from the disc to determine the track switching point; and(d) generating a land/groove switching signal according to the comparison in the step (a), the sequence of sectors determined in the step (b) and the number of sectors counted in the step (c).