Patent ID: 7043013
Filing Date: 2006-05-09
Classification: H04M

Abstract:
1. A method for adaptive control of a multi-channel echo cancellation system including N loudspeakers, where N is an integer greater than or equal to 2, and M microphones, where M is an integer greater than or equal to 1, the system including N×M identification filters with variable coefficients, the method comprising: estimating by the identification filters acoustic coupling between the loudspeakers and the microphones under action of control information, the control information being calculated using an adaptive algorithm based on an error signal between a signal detected by the microphones and a reference signal that includes an estimated signal output from the identification filters, and a variable coefficients adaptive step, wherein the reference signal further comprises a signal equal to a sum of P estimated supplementary signals output from P identification filters, where P is an integer between 1 and N−1, and the variable coefficients adaptive step depends on whether or not there is a signal present on the P loudspeakers, and wherein the variable coefficients adaptive step is equal to zero if there is a signal present on at least one of the loudspeakers.