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류권열,안주원,문광석 釜慶大學校 1999 釜慶大學校 論文集 Vol.4 No.1
In this paper, an adaptive acoustic echo canceller based on the wavelet transform filter banks is proposed. The proposed algorithm improves the performance of AEC with a realtime process. The conjugate quadrature filter by Daubechies D4 wavelet is used for proposed wavelet subband filter banks. Adaptive filter coefficients of each subband are updated using LMS algorithm. Subband output signal vectors of adaptive filter are synthesized by synthesis filter banks. The output of adaptive filter is obtained a widband characteristics. As a result of computer simulation using the practical speech signal, the proposed method reduces noise level about l6dB.