Patent ID: 7436739

Claim:
A correcting method for differential push-pull (DPP) tracking error signals of an optical disk drive, said correcting method comprises the following steps: (A) Dividing an optical disk into a plurality of areas according to magnitudes of peak values of said DPP tracking error signals, wherein a difference between every two of said DPP peak values of neighboring areas being larger than a predetermined value; (B) Under a non-track locking state, measuring average peak values of said DPP peak values respectively of every of said areas in said step A for calculating a gain value of each of said areas according to said average DPP peak values and an ideal DPP peak value; and (C) when in accessing to one of said areas of said optical disk, said optical disk drive proceeding to gain correction for said DPP tracking error signals according to a corresponding gain value of said area accessed; thereby said optical disk drive performs gain correction for said DPP tracking error signals using said corresponding gain value of each of said areas when said area being accessed, in order that said DPP peak values after accessing being approximately consistent to increase stability of control of tracking.