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Adaptive Azimuthal Null-Steering for a First-order Microphone Response
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Rene Derkx
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Digital Signal Processing group, Philips Research, Eindhoven, Netherlands
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An azimuth steerable first-order superdirectional microphone response can be constructed by a combination of a monopole and two orthogonal dipole microphones. We derive a novel adaptive null-steering scheme based on the generalized sidelobe canceller (GSC), aiming to reject a single directional interference. To fully exploit the three microphone inputs, we use the extra degree of freedom to optimize the directivity index. Besides closed-form expressions for this optimal null-steering, we present a novel gradient-search strategy.
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