An echo canceller includes receive and send paths each having an input and output port, a first non-adaptive filter with first filter coefficients for generating a first replica signal in response to a receive input signal, a second adaptive filter with second filter coefficients for generating a second...http://www.google.fr/patents/US5664011?utm_source=gb-gplus-shareBrevet US5664011 - Echo canceller with adaptive and non-adaptive filters
Echo canceller with adaptive and non-adaptive filters
