Patent ID: 7583569

Claim:
An apparatus for generating a tracking error signal comprising: an analog-to-digital conversion module for receiving a plurality of analog signals generated by accessing an optical disc and converting the plurality of analog signals to a plurality of digital signals according to a sampling rate; a frequency control module coupled to the analog-to-digital conversion module for adjusting the sampling rate according to the plurality of digital signals; and a signal generation module coupled to the analog-to-digital conversion module for generating the tracking error signal according to the plurality of digital signals; wherein the frequency control module comprises: at least a detection module coupled to the analog-to-digital conversion module for generating at least a detection value according to the plurality of digital signals and a plurality of delay signals, wherein the detection value comprises a first detection value and a second detection value and the plurality of delay signals are generated according to the plurality of digital signals; and a frequency control unit coupled to the detection module for increasing or decreasing the sampling rate by comparing the first and second detection value.