METHOD OF CAPTURING CONSTANT ECHO PATH INFORMATION IN A FULLDUPLEX SPEAKERPHONE

摘要

A method of improving convergence of an echo canceller in a full duplex speakerphone, wherein the echo canceller includes LEC (Line Echo Canceller) and AEC (Acoustic Echo Canceller) portions, comprising the steps of capturi ng coefficients during operation, storing the coefficients, and utilizing the stored coefficients as default values during start-up of a subsequent call. Accordi ng to the method of the present invention, the amount of echo cancellation necessary t o provoke a save of the coefficients decreases with time when it is not achiev ed by the system despite the presence of a reference signal (i.e. speakerphone signal) .