Channel Decorrelation For Stereo Acoustic Echo Cancellation In High-Quality Audio Communication

TL;DR

This paper introduces a perceptually motivated method combining a SCAL filter and psychoacoustically masked noise to effectively reduce stereo channel correlation, improving acoustic echo cancellation in high-quality audio systems.

Contribution

The paper presents a novel decorrelation technique that significantly outperforms existing methods without compromising audio quality.

Findings

Significantly improved channel decorrelation performance

Effective reduction of stereo channel correlation

Maintains high audio quality during decorrelation

Abstract

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.