Accession Number : ADD017452

Title :   Far Field Acoustic Radiation Reduction.

Descriptive Note : Patent, filed 30 Sep 93, patented 10 Jan 95,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Sartori, Michael A ; Clark, Joseph A

Report Date : 10 Jan 1995

Pagination or Media Count : 6

Abstract : A system and method are provided to reduce a structure's far field acoustic radiation signature. A plurality of acoustic sensors are positioned in the acoustic near field of the structure for measuring the near field acoustic radiation of the structure. A programmable controller generates a prediction of the structure's far field acoustic radiation signature using the near field acoustic radiation. The prediction is then used to generate a noise control signal applied to a plurality of acoustic radiators suspended within the structure. The radiators convert substantially all of the noise control signal to airborne acoustic energy within the structure. (AN)

Descriptors :   *ACOUSTIC SIGNATURES, *PATENTS, SIGNAL PROCESSING, VIBRATION, MICROPROCESSORS, ACOUSTIC WAVES, COMPUTER PROGRAMMING, AIRBORNE, SIGNAL TO NOISE RATIO, FAR FIELD, ACOUSTIC SIGNALS, NOISE REDUCTION, NEAR FIELD, ACOUSTIC FIELDS, ACOUSTIC DETECTORS, PHASE SHIFT

Subject Categories : Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE