ADAPTIVE FILTER FOR ECHO CANCELLATION, METHOD FOR OPERATING AN ADAPTIVE FILTER FOR ECHO CANCELLATION, AN ARTICLE OF MANUFACTURE FOR DETERMINING TAP WEIGHTS AND A LENGTH FOR AN ADAPTIVE FILTER FOR ECHO CANCELLATION AND A COMPUTER IMPLEMENTED CONTROL SYSTEM FOR DETERMINING TAP WEIGHTS AND A LENGTH FOR AN ADAPTIVE FILTER FOR ECHO CANCELLATION

摘要

An adaptive filter for echo cancellation includes a segmented sparse transversal filter having an input, the filter having an adjustable length, adjustable lengths for the segments and adjustable tap weights. The adaptive filter further includes an adaptive tap weight control mechanism providing a tap weight vector including tap weights and a tap weight vector length to the taps of the transversal filter, the adaptive tap weight control mechanism setting the tap weights and the tap weight vector length in response to comparison of estimated truncation error to a target truncation value and in response to a magnitude of integrated cross correlation coefficients between a reference signal and an error signal from the adaptive filter.