Patent ID: 6236628
Filing Date: 2001-05-22
Classification: G11B

Abstract:
A read channel circuit of an optical disk reproducing apparatus comprising a servo processor for generating an offset revision control signal and a pit depth revision control signal for minimizing tracking error signals, the read channel circuit comprising:a data converting section for amplifying a plurality of input signals received via different channels and converting the reference signals to digital signals;a data reproducing section for receiving the digital signals from the data converting section, summing and waveform-equalizing the digital signals to generate waveform-equalized signals, detecting a phase difference between the waveform-equalized signals and reference sampling points, and generating a sampling clock frequency which is supplied to the data converting section for compensating for the phase difference; anda servo error signal detecting section for receiving the digital signals from the data converting section, delaying the digital signals by phases specified by the offset revision control signal and the pit depth revision control signal to generate delayed signals, summing the delayed signals to generate summed signals, and generating the tracking error signals based on a comparison of phase differences between the summed signals.