Patent ID: 7633842

Claim:
An apparatus for generating a tracking error signal comprising: a signal generation module for generating a first and a second candidate tracking error signal according to a light beam reflected off an optical disc; a quality detection module coupled to the signal generation module for detecting quality of the first and/or the second candidate tracking error signal; and a signal-synthesizing module coupled to the signal generation module and the quality detection module, wherein the signal-synthesizing module is controlled by the quality detection module for selectively generating a tracking error signal according to the first and/or the second candidate tracking error signal; wherein if the quality detection module determines that quality of the first candidate tracking error signal is better than quality of the second candidate tracking error signal, the quality detection module controls the signal-synthesizing module to generate the tracking error signal exclusively according to the first candidate tracking error signal; if the quality detection module determines that quality of the second candidate tracking error signal is better than quality of the first candidate tracking error signal, the quality detection module controls the signal-synthesizing module to generate the tracking error signal exclusively according to the second candidate tracking error signal.