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Updated: May 22, 2026

Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters
Published on: February 4, 2018
A directionally tunable but frequency-invariant beamformer on an acoustic velocity-sensor triad to enhance speech
Yue Ivan Wu1, Kainam Thomas Wong, Xin Yuan
1Centre for Signal Processing, Nanyang Technological University, 50 Nanyang Avenue, 639798 Singapore, Singapore.
Abstract:
Herein investigated are computationally simple microphone-array beamformers that are independent of the frequency-spectra of all signals, all interference, and all noises. These beamformers allow the listener to tune the desired azimuth-elevation "look direction." No prior information is needed of the interference. These beamformers deploy 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 Mandarin Chinese (a.k.a. Putonghua) 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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