Patent ID: 7693012

Claim:
An apparatus for demodulating an Address In Pre-groove (ADIP) symbol, wherein the ADIP symbol is carried by a wobble signal of an optical disk and comprises a series of ADIP bits permuted according to one of a plurality of permutation patterns to make up the ADIP symbol, the apparatus comprising: a wobble extraction module, extracting the wobble signal from the optical disk; a reference wobble generator, generating a reference wobble with the same frequency and phase as a fundamental frequency and phase of a positive wobble cycle of the wobble signal; a waveform difference measurement module, coupled to the wobble extraction module and the reference wobble generator, measuring a difference between the wobble signal and the reference wobble to obtain a series of difference measurement values respectively corresponding to the ADIP bits; and a pattern matching module, coupled to the waveform difference measurement module, comparing probabilities of the permutation of the ADIP bits agreeing with each of the permutation patterns according to the difference measurement values to determine the ADIP symbol.