Patent ID: 7149170
Filing Date: 2006-12-12
Classification: G11B

Abstract:
1. A method for decoding address data of an optical disc drive for decoding an input wobble signal into an address data unit signal, the optical disc drive comprising a phase lock loop, a cosine signal generator, a multiplier, an accumulator, a phase data processor and an address data unit detector, the method comprising: (a) converting a wobble carrier frequency signal output by the phase lock loop into a wobble carrier frequency signal with the same phase as the input wobble signal using the cosine signal generator; (b) multiplying the wobble frequency signal, output by the cosine signal generator, with the input wobble signal to obtain a product signal using the multiplier; (c) accumulating the product signals at each clock to obtain a quotient summation signal using the accumulator; (d) determining phase changes of the input wobble signal according to whether the quotient summation signal is positive or negative to obtain a phase change signal using the phase data processor; and (e) comparing the phase change signal with the plurality of address data patterns using the address data unit detector, and determining an address data unit signal according to the address data pattern closest to the phase change signal.