A method of coherence-based step-size control for robust stereo echo cancellation

A fast adaptive algorithm is required for stereo echo cancellation because the strong interchannel cross-correlation of stereo received signals leads to an ill-conditioned normal equation to be solved by the adaptive filter. An adaptive algorithm for this task should also be robust against disturbances such as near-end speech and near-end noise. We propose a coherence-based method of step-size control that provides robustness in stereo echo cancellation. Computer simulation demonstrates that the method is robust against near-end speech and noise, and is capable of quickly tracking changes in echo paths.