Patent ID: 6658054
Filing Date: 2003-12-02
Classification: G11B,H03H

Abstract:
A waveform equalizer for performing a waveform equalization to a read signal, comprising:inclination discriminating means for discriminating an ascending slope portion and a descending slope portion of said read signal; a filter for performing a filtering process to said read signal; and characteristics switching means for switching frequency characteristics of said filter in accordance with a discrimination output of said inclination discriminating means, wherein the inclination discrimination means receives said read signal as an input signal to which said filtering process has not been applied, and wherein said filter has a first filter in which frequency characteristics for said ascending slope portion are set and a second filter in which frequency characteristics for said descending slope portion are set, and said characteristics switching means selects an output signal of either one of said first and second filters and uses the selected output signal as an output signal of the waveform equalizer.