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- W2046586145 abstract "A microphone array system based on a three-dimensional random geometry is introduced. Three-dimensional microwave volumetric array antennas have recently been investigated as potential systems for radar and communications applications [A. Tennant and A. F. Fray, ‘‘A 64 element broad band volumetric array antenna,’’ IEEE International Antenna and Propagation Symposium, Atlanta, 1998]. In a volumetric array, the elemental receivers occupy a solid region of three-dimensional space. A spherical array geometry is preferred. This provides the potential for full scan coverage. The projected aperture of a spherical array is direction independent, with the beam width and gain of the directional response being constant for all scan angles. The system developed consists of 64 omnidirectional microphones arranged at pseudorandom locations within a spherical volume. The nonperiodic element arrangement has two advantages. First, it eliminates the possibility of large grating lobes, and therefore enables wide-angle beam steering over a very large frequency bandwidth. Second, this geometry results in an array reception pattern with an average side-lobe level that is inversely proportional to the number of array elements. The potential of acoustic volumetric arrays is examined and the results of theoretical and experimental investigations presented. Applications areas include covert surveillance, imaging, and auditorium characterization." @default.
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- W2046586145 date "2000-05-01" @default.
- W2046586145 modified "2023-09-24" @default.
- W2046586145 title "An acoustic volumetric array system" @default.
- W2046586145 doi "https://doi.org/10.1121/1.429172" @default.
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