Patent ID: 9154187
Filing Date: 2015-10-06
Classification: H04B

Abstract:
1. A method for operating a filter for echo cancellation, the method comprising: estimating a communication channel echo using the filter; calculating an echo cancellation error as the difference between the estimated communication channel echo and an input signal received at the filter; monitoring at least one of a filter coefficient of the filter and the echo cancellation error to generate a monitoring result; and in response to the monitoring result, adjusting at least one of delay elements and filter taps of the filter to vary an impulse response of the filter by simultaneously turning on or turning off a set of switches including a first set of switches and a second set of switches, where the first set of switches controls a connection between a delay element of the filter and a corresponding multiplier of the filter and the second set of switches controls a connection between the corresponding multiplier and a corresponding adder unit of the filter.