스테레오 음향반향제거기의 BSS 후처리방법

Abstract

This paper is on a stereo acoustic echo canceller with the blind signal separation for postprocessing. The convergence speed of the stereo acoustic echo canceller is deteriorated due tomixing two residual signals which are update signals of each echo canceller. To solve thisproblem, we are to use the blind signal separation(BSS) method separating the mixed signalsafter the echo cancellers. The blind signal separation method can extracts the source signalsby means of the iterative computations with two input signals. We had verifiedperformances of the proposed acoustic echo canceller for stereo through simulations. Theresults of simulations show that the acoustic echo canceller for stereo using this algorithmoperates stably without divergence in the normal state. And, when the speech signals wereinputted, this echo canceller achieved about 2dB higher ERLE with the BSS post processingmethod than without this method. This stereo echo canceller showed the best performance inthe case of inputting the real voice signal.