Patent ID: 6470474
Filing Date: 2002-10-22
Classification: G11B

Abstract:
A method for identifying errors in a detected sequence of values that are determined from first channel samples obtained at an output of a signal transmission channel equalized to a first channel response characteristic, the method comprising steps of:(a) generating the detected sequence of values from the first channel samples using a detector designed for a channel with a first channel response characteristic; (b) filtering the detected sequence of values using a filter capable of emulating a second channel response characteristic to produce a sequence of simulated second channel samples; (c) filtering the first channel samples using a filter capable of emulating a response characteristic that is equal to the second channel response characteristic divided by the first channel response characteristic, the filtering producing a sequence of actual second channel samples; (d) generating a sequence of difference values, each difference value based on the difference between a corresponding simulated second channel sample and a corresponding actual second channel sample; and (e) identifying at least one error in the detected sequence of values based on the sequence of difference values.