TAP COEFFICIENT UPDATING METHOD OF CHANNEL EQUALIZER AND ITS APPRATUS USING VARIABLE ADAPTIVE CONSTANT

摘要

[Technical field to which the invention described in the claims belong];HDTV Channel Equalizer.;[Technical Challenges to Invent];Since the adaptive constant for adjusting the tap coefficient of the filter is fixed to an arbitrary value in the channel equalizer of the conventional HDTV, the convergence of the adaptive filter is deteriorated according to the change of the channel environment.;[Summary of the solution of the invention];The sign of the error signal e (n) obtained using the field sync signal extracted from the data input to the channel equalizer and the sign of the signal x (ni) input to the channel equalizer are compared, and according to the change value of the sign. By varying the adaptation constant it is characterized in that to maintain the tap coefficient corresponding to the channel environment.;[Important Uses of the Invention];This is applied to adjust the tap coefficient of the adaptive filter included in the HDTV channel equalizer.