Patent ID: 7697380

Claim:
An apparatus for detecting the wobble carrier frequency of an optical disk, comprising: an offset canceller, canceling the direct current (DC) offset of a first wobble signal to obtain a second wobble signal; a binary conversion module, coupled to the offset canceller, converting the second wobble signal to a binary data stream; an adjustable band pass filter, coupled to the binary conversion module, passing only an adjustable frequency range of the binary data stream to generate a filtered signal, wherein the center frequency of the adjustable frequency range is sequentially adjusted according to a frequency selection signal; and a frequency detection module, coupled to the adjustable band pass filter, determining a maximum amplitude of the filtered signal, and determining the center frequency of the adjustable frequency range according to which the filtered signal with the maximum amplitude is generated; wherein the wobble carrier frequency of the optical disk is the center frequency of the adjustable frequency range corresponding to the maximum amplitude of the filtered signal.