ECHO CANCELLER WITH ADAPTIVE AND NON-ADAPTIVE FILTERS-Patent application

摘要

The echo canceller includes a first mux filter having a receive and transmit path having respective input and output ports, a first filter coefficient for generating a first replica signal in response to a received input signal, A second adaptive filter having a second filter coefficient for generating a signal, a first subtractor for generating a transmission output signal indicative of a difference between the transmission input signal and the first replica signal, A second subtractor for generating an error signal representative of the difference and a second filter coefficient to replace the first filter coefficient with a sum of the first and second filter coefficients and to generate a first quantity related to the transmission output signal and a second quantity And resetting the second filter coefficient.