Patent ID: 7724893

Claim:
A method of controlling rate of adaptation of an adaptive filter in an echo canceller, having both hardware and software components, to accommodate different hybrids connected thereto, comprising: calculating an expected Echo Return Loss Enhancement (ERLE) for said echo canceller; calculating current ERLE of an input signal (Sin) applied to said echo canceller; determining if the current ERLE is greater than the expected ERLE multiplied by a constant (Stage 1 ERLEFactor), then adjusting the adaptation step (mu) to Mu=Mu*MuRedFactorMin, and if the current ERLE is greater than or equal to the expected ERLE, then adjusting the adaptation step (Mu) to Mu=Mu*MuRedFactorMax; and one of either (i) increasing the adaptation step of said adaptive filter in the event the difference between the current ERLE and the expected ERLE is greater than a predetermined amount, or (ii) decreasing said adaptation step in the event said difference is less than said predetermined amount.