Optical disk drive and correcting method for differential push-pull tracking error signals of the optical disk drive

An optical disk drive having a function of correcting push-pull (DPP) tracking error signals, said optical disk drive comprises:

• a data signal processor (DSP);
• a correction module for correcting DPP tracking error signals executed by said DSP to execute the following commands:
• (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 is larger than a predetermined value;
• (B) under a non-track locking state, measuring respectively average DPP peak values of every of said areas in said command 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.