Evaluation of signal distortion methods for stereophonic acoustic echo cancellation

In this paper, we evaluate two distortion methods used to preprocess the signals in stereophonic acoustic echo cancellation, i.e., the classical “half-wave rectifiers” and the recently proposed “phase half-wave rectifiers.” The comparison is based on the perceptual degradation of sound quality, which is evaluated using the ITU-T P.862 Recommendation. The experimental results indicate the superiority of the recently proposed distortion method.