DTIC ADA284991: Passive Aero Acoustic Sensor Self pdf

DTIC ADA284991: Passive Aero Acoustic Sensor Self

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Description of the Book:

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

• Creator/s: Defense Technical Information Center
• Date: 4/23/1994
• Year: 1994
• Book Topics/Themes: DTIC Archive, Rosenthal, Felix, SIGNAL SEPARATION TECHNOLOGIES ANNANDALE VA, *ACOUSTIC ATTENUATION, *ARMORED PERSONNEL CARRIERS, *ACOUSTIC DETECTORS, TEST AND EVALUATION, AIRCRAFT, HELICOPTERS, INTERFERENCE, GROUND VEHICLES, DECOMPOSITION, MICROPHONES, SELF NOISE, ROOFS, MULTICHANNEL, CHANNELS, ENGINE NOISE, ARMY, NOISE REDUCTION, ACOUSTIC SIGNALS, ACOUSTICS, ROADS, NOISE

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