A Directionally Tunable but Frequency-Invariant Beamformer for an “Acoustic Velocity-Sensor Triad”
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"A Directionally Tunable but Frequency-Invariant Beamformer for an “Acoustic Velocity-Sensor Triad” to Enhance Speech Perception Herein presented is a simple microphone-array beamformer that is independent of the frequency-spectra of all signals, all interference, and all noises. This beamformer allows/requires the listener to tune the desired azimuth-elevation “look direction.” No prior information is needed of the interference. The beamformer deploys a physically compact triad of three collocated but orthogonally oriented velocity sensors. These proposed schemes’ efficacy is verified by a jury test, using simulated data constructed with speech samples. For example, a desired speech signal, originally at a very adverse signal-to-interference-and-noise power ratio (SINR) of -30 dB, may be processed to become fully intelligible to the jury."
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