Patent ID: 7408891

Claim:
An echo canceller comprising: a digital filter having adaptive coefficients which are updated to simulate an echo response; a temporary register for storing default coefficients; a controller for monitoring Echo Return Loss Enhancement (ERLE) and in the event that the ERLE is less than a first predetermined threshold, the controller replaces said adaptive coefficients in said digital filter with said default coefficients from said temporary register, said adaptive coefficients remaining as said default coefficients from said temporary register until the ERLE is greater than a second predetermined threshold, subsequent to which said default coefficients in said temporary register are updated by said controller with said adaptive coefficients; and a counter in communication with said controller, said counter counting speech samples of an incoming signal while the short term energy average of said incoming signal exceeds a further predetermined threshold and, in the event that said counter counts in excess of a predetermined counter threshold, said controller then initializes said adaptive coefficients, said default coefficients and the ERLE which are set to zero.