Abstract
This paper addresses die problem of acoustic echo cancellation in non-linear environments. The first contribution relates to tile use of a cascaded model which divides the loudspeaker enclosure microphone system into two main blocks; the first models the down link transducers which are assumed to be the main source of non linearity. The second block includes the acoustical channel and up link transducers which are assumed to be linear and have a comparatively longer impulse response and higher time variability. The second contribution is a new non-linear adaptive echo canceler which is based on the cascaded model and has greater robustness to changes in the acoustic channel than an existing power filter approach.
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