Patent ID: 7245658

Claim:
A read channel apparatus for reading data recorded on an optical storage system at a predetermined baud rate, comprising: a sampling device for asynchronously sampling an analog read signal generating from the optical storage system to generate a sequence of asynchronous sample values; a subtractor for subtracting an estimated DC offset from the asynchronous sample values to generate a sequence of asynchronous DC-removed sample values; an equalizer for equalizing the asynchronous DC-removed sample values in accordance with a target spectrum to generate a sequence of equalized sample values; a first interpolator for interpolating the equalized sample values to generate a sequence of synchronous even-time sample values; a second interpolator for interpolating the equalized sample values to generate a sequence of synchronous odd-time sample values, wherein a data sequence composed of the even-time sample values and the odd-time sample values is substantially synchronized to the baud rate; a timing recovery controller, responsive to the even-time sample values and the odd-time sample values, for controlling the first interpolator and the second interpolator respectively in order to synchronize the even-time and odd-time sample values to the baud rate; and a DC offset estimator for generating the estimated DC offset from the even-time sample values and the odd-time sample values.