Patent ID: 7289410

Claim:
An ADIP demodulation apparatus, which is applied to an optical disk driver to generate ADIP information according to a wobble signal, the ADIP demodulation apparatus comprising: a slicing unit for receiving the wobble signal and generating a wobble pulse by slicing the wobble signal; a phase locked loop for generating a reference wobble signal with the same frequency and phase as the wobble pulse according to the wobble pulse; a channel bit generator for producing a channel bit signal according to a difference signal generated by comparing the phase of the reference wobble signal with that of the wobble pulse; and a decoder for decoding to the ADIP information according to the channel bit signal; wherein the channel bit generator comprises: a bit comparator for receiving the wobble pulse and the reference wobble signal and generating the difference signal; a counter for counting the width of high level of the difference signal corresponding to each wobble pulse using a counting clock and outputting a unit value; and a decision unit for comparing the count value with a threshold value and then outputting the channel bit signal.