METHOD AND APPARATUS FOR CONTROLLING ECHO ON BOTH SIDES OF A CONNECTION

摘要

A single two-ended echo canceller (102) is provided that uses an adaptive FIR filter (112) to model the impulse response of the echo path and cancel the echo originating from the PSTN side of the connection, and a non-linear processor (114) controlled by input signal levels to cancel the echo originating from the mobile phone side of the connection. Since the linear processing function is not used for cancelling echoes of the mobile phone side, the algorithms directed to estimating and cancelling echoes on the two sides of the connection can be executed in a single DSP, with all of the attendant advantages.