Abstract

A signal decorrelation technique is presented which aims at alleviating the non-uniqueness problem in Stereophonic Acoustic Echo Cancellation (SAEC) whilst minimising the degradation on stereo signal perception. The proposed technique is based on higher-order time-varying allpass filters (HO-TV-APFs) utilising spectral-shaped noise, together with the interpolation method. Two approaches for spectral-shaped random noises are introduced, while the test results on speech signals indicate improved performance in both objective and subjective manners.