Channel Decorrelation For Stereo Acoustic Echo Cancellation In High-Quality Audio Communication
This addresses the problem of echo cancellation in stereo audio systems for users in high-quality communication, representing an incremental improvement over existing decorrelation techniques.
The paper tackles the under-determined problem of stereo acoustic echo cancellation in high-quality audio communication by reducing channel correlation without affecting audio quality, showing that the proposed method performs significantly better than other known decorrelation methods.
In this paper, we address an important problem in high-quality audio communication systems. Acoustic echo cancellation with stereo signals is generally an under-determined problem because of the generally important correlation that exists between the left and right channels. In this paper, we present a novel method of significantly reducing that correlation without affecting the audio quality. This method is perceptually motivated and 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 channel decorrelation.