Patent ID: 7269214

Claim:
A waveform equalizer for performing a waveform equalizing process on a read sample value sequence obtained by sampling a read signal of a recording medium at clock timings of a channel clock signal, to produce an equalization corrected read sample value sequence, said waveform equalizer comprising: an A/D converter for obtaining a read sample value sequence by sampling said read signal at clock timings of a channel clock signal; interpolating means for obtaining a sampled value sequence, based on said read sample value sequence, that is obtained when said read signal is sampled at intermediate timings between said clock timings, and outputting said sampled value sequence as interpolated read sample value sequence; amplitude limiting means for limiting an amplitude of said interpolated read sample value sequence to a predetermined amplitude limiting value, to obtain an amplitude limited read sample value sequence; a filter for performing a filtering process on said amplitude limited read sampled value sequence, and outputting a filter output signal; delay means for delaying said interpolated read sample value sequence, to obtain a delayed interpolated read sample value sequence; and summing means for summing said delayed interpolated read sample value sequence and said filter output signal, and outputting a summed value as said equalization corrected read sample value sequence.