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Robust microphone array using subband adaptive beamformer and spectral subtraction

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3 Author(s)
Siow Yong Low ; Western Australian Telecommun. Res. Inst., Univ. of Western Australia, Perth, WA, Australia ; Grbic, Nedelko ; Nordholm, S.

This paper presents a new robust microphone array to enhance speech signal under the influence of noise and jammer(s). The proposed structure comprises of a soft constrained subband beamformer, a blocking system and a non-coherent processing technique. The soft constrained beamformer enhances the desired speech signal in a specified region by suppressing all side-lobes. This enhanced signal is then used as a reference signal by the blocking system to estimate the interference spectrum. Finally, the beamformer's output is spectral subtracted using the estimated interference spectrum. Simulations in a real office environment show higher interference suppression level compared to those obtained using the soft constrained beamformer only. Most importantly. this is achieved with negligible expense on target signal distortion.

Published in:

Communication Systems, 2002. ICCS 2002. The 8th International Conference on  (Volume:2 )

Date of Conference:

25-28 Nov. 2002