Wind Noise Reduction Using the Multiple Aperture Sensor System
Small Business Information
7923 Jones Branch Dr, Mclean, VA, 22102
AbstractWind noise in outdoor measuemetn micropnones can mask an acoustic signal. Windscreens provide some wind noise reduction; however, those typically used for outdoor applications provide noise reductions of approximately 10-15 dB. Planning Systems Incorporated (PSI) proposes to design and test a Multiple Aperture Sensor System (MASS) consisting of a microphone, a processor, and data acquisitio and signal processing software. The system will be designed to adaptively remove wind noise via spatial filtering. Improvement ni the signal-to-noise ratio in a windscreened microphone will be realized by spatially filtering the wind noise. Calculations show that wind noise reduction for a seven sensor-element microphone with .125m sensor-element spacing should increase by an additional 20-55 dB. For Phase I, PSI will perform a feasibility study which includes theoretical design, experimental testing, and system evaluation for a low-frequency (10-50 Hz) system. The microphone will also be tested at higher frequencies to determine its commercial viability as a microphone for use in jet noise measurements, outdoor concerts, speeches, and other applications.
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