Adaptive Filtering Algorithm Enhancing Decorrelated Additive Signals for Stereo Echo Cancellation

The strong inter-channel cross correlation between stereo received signals creates a problem of non-unique solutions for stereo echo cancellation. To avoid this problem, the addition of inaudible non-linearly filtered received signals to themselves was proposed. However, the convergence of misalignment is still slow even when the affine projection algorithm is used, since strong inter-channel cross correlation remains in the adjustment vector. We propose an enhanced affine projection algorithm in which the adjustment vector is welldecorrelated by enhancing non-linearly filtered received signals. Computer simulation demonstrated that the enhanced affine projection algorithm can decrease misalignment much faster than the conventional affine projection algorithm.