Some Army HMMWV armored personnel carrier vehicles carry air-acoustic sensor systems comprised of a complement of roof-mounted microphones to detect and identify other vehicles and aircraft such as helicopters. The performance of these systems tends to become degraded as a result of the vehicle's own engine and road noise. Multi-channel noise cancellation, if correctly applied, is capable of removing most of the own-vehicle's engine self noise from the microphone outputs. The purpose of this project is to improve the performance of these acoustic systems through the application of multi-channel noise cancellation. The purpose of Phase I was to establish the efficacy of Signal Separation Technologies' SFR-SFC (signal-free Reference using Singular-value Decomposition) technique for performing multi-channel noise cancellation for the aero-acoustic sensor application. This efficacy has been firmly established as a result of Phase I tests and analysis. In a typical example, a signal peak previously submerged in noise of the same level was made to stand out over the noise by some 15 dB. The SFR-SVD technique to do multi-channel noise cancellation is covered by U.S. Patent No. 5,209,237 and foreign patents. It is available to the U.S. Government for Government purposes only on a royalty-free basis. For all other purposes, a license must be negotiated with Signal Separation Technologies. HMMWV Vehicle, Armored personnel carrier, Detection.
Passive Aero-Acoustic Sensor Self Interference Cancellation. Phase 1
1994
80 pages
Report
No indication
English
Acoustic Detection , Combat Vehicles , Acoustic detectors , Acoustic attenuation , Aircraft , Decomposition , Helicopters , Microphones , Roads , Self noise , Test and evaluation , Ground vehicles , Noise reduction , Multichannel , Engine noise , Acoustic signals , HMMWV(High Mobility Multipurpose Wheeled Vehicles)
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