This paper addresses the problem of acoustic echo cancellation in
non-linear environments. The first contribution relates to the use
of a cascaded model which divides the loudspeaker enclosure microphone
system into two main blocks; the first models the downlink
transducers which are assumed to be the main source of nonlinearity.
The second block includes the acoustical channel and uplink
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.