A new adaptive beamformer which combines the idea of subband processing and the generalised sidelobe canceller structure is presented. The proposed subband beamformer has a blocking matrix that uses coefficient-constrained subband adaptive filters to limit target cancellation within an allowable range of direction of arrival. Simulations comparing the fullband and subband adaptive beamformers show that the subband beamformer has better performance than the fullband beamformer when the target and/or interfering signals are coloured. In reverberant environments, the proposed subband beamformer also performs better than its fullband counterpart.
Inspec keywords: reverberation; acoustic signal processing; microphones; adaptive signal processing; acoustic transducer arrays; noise abatement; direction-of-arrival estimation; array signal processing; adaptive filters
Other keywords:
Subjects: Acoustic noise, its effects and control; Acoustic signal processing; Audio equipment and systems; Filtering methods in signal processing; Transduction; devices for the generation and reproduction of sound
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