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In this paper, the notion of orthogonal nonseparable trivariate wavelet packets which is the generalization of orthogonal univariate wavelet packets, is introduced. A new procedure for constructing them is presented. Their orthogonality property is characterized by the filter bank theory and time-frequency analysis. Three orthogonality formulas concerning these wavelet packets are established.
A new subband adaptive beamforming method for microphone array speech enhancement is proposed in the paper, which is used to enhance speech signals corrupted by noise in the enclosure environment. It applies the idea of subband processing into the generalized sidelobe canceller (GSC) and post-filter. An oversampled cosine-modulated filter bank is adopted to improve convergence speed of full-band adaptive...
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