New configuration for a stereo echo canceller with nonlinear pre-processing

A new con guration for a stereo echo canceller with nonlinear pre-processing is proposed. The pre-processor which adds uncorrelated components to the original received stereo signals improves the adaptive lter convergence even in the conventional con guration. However, because of the inaudibility restriction, the preprocessed signals still include a large amount of the original stereo signals which are often highly crosscorrelated. Therefore, the improvement is limited. To overcome this, our new stereo echo canceller includes exclusive adaptive lters whose inputs are the uncorrelated signals generated in the pre-processor. These exclusive adaptive lters converge to true solutions without su ering from cross-correlation between the original stereo signals. This is demonstrated through computer simulation results.