Frequency-independent beamformer with low response error
- 19 November 2002
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- Vol. 5 (15206149) , 2995-2998
- https://doi.org/10.1109/icassp.1995.479475
Abstract
A method is developed for designing broadband beamformers with highly frequency-invariant behavior. The method combines harmonic nesting with filter-and-sum beamforming, yielding systems with efficient log-periodic transducer structures and plane wave responses which deviate from the desired response by less than 1% of the peak mainlobe response. In particular, null locations are very constant with frequency, allowing the nulling of directional broadband interference. A digital implementation covering audio frequencies (500-7200 Hz) is built and demonstrates results in good agreement with simulations, yielding deviations under 5% of peak response.Keywords
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