  Acoustic echo cancellation with stereo signals is generally an
under-determined problem because of the high coherence between the left and
right channels. In this paper, we present a novel method of significantly
reducing inter-channel coherence without affecting the audio quality. Our work
takes into account psychoacoustic masking and binaural auditory cues. The
proposed non-linear processing combines a shaped comb-allpass (SCAL) filter
with the injection of psychoacoustically masked noise. We show that the
proposed method performs significantly better than other known methods for
reducing inter-channel coherence.
