SUBBAND ADAPTIVE BEAMFORMING FOR MICROPHONE ARRAY SPEECH ENHANCEMENT

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 beamforming and avoid aliasing between subband signals. In addition, in order to reduce speech signal cancellation brought by reverberation, a subband mean coherence function is introduced to control the adaptive processing of multichannel noise canceller. Simulation experiments results that the proposed method exhibits better noise reduction performance than full-band counterparts

[1]  永原 正章,et al.  Multirate digital signal processing via sampled-data H∞ optimization , 2003 .

[2]  Glen M. Ballou.  Handbook for Sound Engineers The New Audio Cyclopedia , 1988 .

[3]  R. Zelinski,et al.  A microphone array with adaptive post-filtering for noise reduction in reverberant rooms , 1988, ICASSP-88., International Conference on Acoustics, Speech, and Signal Processing.

[4]  Nam Ik Cho,et al.  On the performance analysis and applications of the subband adaptive digital filter , 1995, Signal Process..

[5]  Sven Fischer,et al.  Beamforming microphone arrays for speech acquisition in noisy environments , 1996, Speech Commun..

[6]  L. J. Griffiths,et al.  An alternative approach to linearly constrained adaptive beamforming , 1982 .

[7]  Jont B. Allen,et al.  Image method for efficiently simulating small‐room acoustics , 1976 .

[8]  Ehud Weinstein,et al.  Signal enhancement using beamforming and nonstationarity with applications to speech , 2001, IEEE Trans. Signal Process..

[9]  Jörg Kliewer,et al.  Design of paraunitary oversampled cosine-modulated filter banks , 1997, 1997 IEEE International Conference on Acoustics, Speech, and Signal Processing.

[10]  S. Gannot,et al.  Speech enhancement based on the general transfer function GSC and postfiltering , 2004, IEEE Trans. Speech Audio Process..

[11]  Akihiko Sugiyama,et al.  A robust adaptive beamformer for microphone arrays with a blocking matrix using constrained adaptive filters , 1999, IEEE Trans. Signal Process..

[12]  Hamid Sheikhzadeh,et al.  A hybrid subband adaptive system for speech enhancement in diffuse noise fields , 2004, IEEE Signal Processing Letters.

[13]  Gérard Faucon,et al.  Using the coherence function for noise reduction , 1992 .