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204 - The use of mems cochlear microphone 'fishbone' for arbitrary complex filtering and Hilbert transform
Ando S., Ono N., Ikeuchi N.
Abstract
We are studying on ``Fishbone'' acoustic sensor/actuator (IEEE/ASME Trans. Mechatronics, 3, 2, 98/105, 1998) which is mathematically equivalent to the Zwislocki basilar membrane model of the human cochlea. Its remarkable features are: 1) frequency-decomposed outputs, 2) log-linearity, 3) perfect efficiency, and 4) wide frequency and dynamic ranges. We propose here a novel transduction method and circuit being suitable for single-chip and wireless acoustic/vibrometric sensor utilizaing micromechanical and CMOS fabrication technologies. It has digitally adjustable/selectable complex frequency characteristics for tracking and extracting a target sound from environmental noise, radio-frequency (RF) outputs with direct modulation technique on resonant beams, and Hilbert transform capability to produce real and imaginary signal pair after quadrature-demodulating the RF output. We show theoretical analysis and experimental results using a MEMS fabricated sensor chip.
Citation
Ando S.; Ono N.; Ikeuchi N.: The use of mems cochlear microphone 'fishbone' for arbitrary complex filtering and Hilbert transform, CD-ROM Proceedings of the Thirtheenth International Congress on Sound and Vibration (ICSV13), July 2-6, 2006, Vienna, Austria, Eds.: Eberhardsteiner, J.; Mang, H.A.; Waubke, H., Publisher: Vienna University of Technology, Austria, ISBN: 3-9501554-5-7