Patent ID: 7564747

Claim:
A method for determining a compensation value for tracking error signal, applied in an optical disc drive, the optical disc drive rotating a DVD at a speed and reading data on the DVD, the DVD having a first reflection layer and a second reflection layer, the first reflection layer having a plurality of circles of first tracks, the second reflection layer having a plurality of circles of second tracks, the method comprising: respectively reading data on two first tracks and two second tracks when the optical disc drive rotates the DVD at the speed, and accordingly generating two first compensation values for tracking error signal and two second compensation values for tracking error signal, wherein two of the first tracks are an innermost track and a middle track located between the innermost track and an outermost track; determining a third compensation value for tracking error signal corresponding to each of the other first tracks when the optical disc drive rotates the DVD at the speed according to two of the first compensation values for tracking error signal and position of each of the other first tracks relative to two of the first tracks, wherein the third compensation value corresponding to the first tracks between the innermost track and the middle track is calculated by using a first numerical method and the third compensation value corresponding to the first tracks between the outermost track and the middle track is calculated by using a second numerical method; and determining a forth compensation value for tracking error signal corresponding to each of the other second tracks when the optical disc drive rotates the DVD at the speed according to two of the second compensation values for tracking error signal and position of each of the other second tracks relative to two of the second tracks.