Patent ID: 8538008

Claim:
A system for reducing nonlinear echoes in an acoustic signal, the system comprising in combination: a) a loudspeaker for reproducing audio signals, the loudspeaker occasionally generating non-linear distortion signals; b) a signal processor having an output for providing an output audio signal to be reproduced by the loudspeaker, the signal processor also having a first input and a second input; c) a microphone for detecting speech by a user, the microphone being coupled to the first input of the signal processor; d) an accelerometer physically coupled to the loudspeaker for generating signals indicative of movement by the loudspeaker corresponding to non-linear distortion signals, the accelerometer being coupled to the second input of the signal processor; e) the signal processor including an adaptive filter for subtracting non-linear distortion signals presented by the accelerometer to the second input of the signal processor from audio signals presented by the microphone to the first input of the signal processor before providing the output audio signal to the loudspeaker.