Servo Channel With Equalizer Adaptation

摘要

A servo system includes an equalizer circuit operable to filter digital servo data samples according to filter tap coefficients to yield equalized data, a detector circuit operable to apply a data detection algorithm to the equalized data to yield hard decisions, a convolution circuit operable to yield ideal digital data based on the hard decisions and on target values, a subtraction circuit operable to subtract the ideal digital data from the equalized data to yield an adaptation error signal, an error gradient calculator operable calculate an error gradient signal based at least in part on the adaptation error signal, and a tap adaptation circuit operable to calculate values of the filter tap coefficients based on the error gradient signal.

主权项

1. A servo system comprising:
a hardware equalizer circuit operable to filter digital servo data samples according to filter tap coefficients to yield equalized data; a hardware detector-circuit operable to apply a data detection algorithm to the equalized data to yield hard decisions; a convolution circuit operable to convolve the hard decisions with a target response to yield ideal digital data; a subtraction circuit operable to subtract the ideal digital data from the equalized data to yield an adaptation error signal; an error gradient calculator operable calculate an error gradient signal based at least in part on the adaptation error signal; and a tap adaptation circuit operable to calculate values of the filter tap coefficients based on the error gradient signal.