Patent ID: 6819514
Filing Date: 2004-11-16
Classification: G11B

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) an adaptive equalizer, responsive to the discrete time sample values, for generating equalized sample values according to a target response; (c) an interpolated timing recovery circuit for generating interpolated sample values; and (d) a discrete time sequence detector for detecting the digital data from the interpolated sample values, wherein:the adaptive equalizer comprises an FIR filter comprising a plurality of filter coefficients; the adaptive equalizer is responsive to an error value ek computed as a function of an output of the FIR filter and an estimated ideal value; the adaptive equalizer comprises an interpolation circuit, responsive to the interpolated sample values, for generating the error value ek synchronous with the discrete time sample values.