Patent ID: 6208481
Filing Date: 2001-03-27
Classification: G11B,H04L

Abstract:
A sampled amplitude read channel for reading digital data from a sequence of discrete time sample values generated by sampling an analog read signal from a read head positioned over a magnetic medium, comprising:(a) a sampling device for sampling the analog read signal to generate the discrete time sample values;(b) a timing recovery circuit for synchronizing the discrete time sample values to a baud rate of the digital data;(c) an adaptive equalizer comprising more than three delay elements and a plurality of filter coefficients, responsive to the discrete time sample values, for generating equalized sample values according to a target response;(d) an orthogonal projection circuit for constraining a frequency response of the adaptive equalizer at a predetermined constraint frequency in order to attenuate interference from the timing recovery circuit; and(e) a discrete time sequence detector for detecting the digital data from the equalized sample values.