Patent ID: 6061395
Filing Date: 2000-05-09
Classification: G11B,H04L

Abstract:
A waveform equalizer adopting a transversal filter for suppressing inter-symbol interferences of a transmitted digital information signal by summing weighted values obtained by multiplying the transmitted digital information signal and delayed signals thereof by tab coefficients, each of the tab coefficients being adaptively controlled, the waveform equalizer comprising:a virtual determination means for virtually determining a plausible digital information signal from an output of the transversal filter;an error calculation means for outputting an amplitude error calculated based on the virtual determination result;a retaining and selecting means for retaining and selecting the transmitted digital information signal and the delayed signals thereof; andan updating means for multiplying the amplitude error outputted from the error calculation means by the output signals from the retaining the selecting circuit to thereby update the tab coefficients of the transversal filter in accordance with the multiplication result,wherein the virtual determination means virtually determines a value of the plausible digital information signal by peak detection based on correlations between signal components of the transmitted digital information signal and the error calculation means obtains the amplitude error in accordance with the virtual determination result.