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Título: Characterization of a Virtual Array based on MEMS microphones for the analysis of acoustic sources
Autor: Izquierdo Fuente, Alberto
Villacorta Calvo, Juan José
del Val Puente, Lara
Suarez Vivar, Luis
Congreso: Acoustics’17 Boston: 173rd Meeting of the Acoustical Society of America and the 8th Forum Acusticum
Año del Documento: 2017
Editorial: The Journal of the Acoustical Society of America
Descripción Física: 52p
Descripción: Producción Científica
Documento Fuente: Boston MA (USA), 25–29 June 2017
Resumen: Using arrays with digital MEMS microphones and FPGA-based acquisition/processing systems allows to build systems with hundreds of sensors at a reduced cost. This work analyzes the performance of a virtual array with 6400 MEMS (80 × 80) microphones. The system is composed by a 2D positioning system that places a physical array of 64 microphones (8 × 8) in a grid with 8 x 8 positions, obtaining a spatial aperture of 2 x 2 meters. The measured beampattern is compared with the theoretical one for several frequencies and pointing angles. The beampattern of the physical array is also estimated for each one of the 64 positions used by the positioning system. Also, the measured beampattern and the focusing capacity are analyzed, since beamforming algorithms assume spherical wave due to the large dimensions of the array. Finally, frequency and spatial responses for a set of different acoustic sources are obtained showing angular resolutions of the order of tenths of degree.
Palabras Clave: Acoustic array systems
Microphones
Microelectromechanical systems
Spatial resolution
Spatial dimensions
DOI: http://dx.doi.org/10.1121/1.4988154
Patrocinador: MINECO/FEDER, UE TEC 2015-68170-R
Idioma: eng
URI: http://uvadoc.uva.es/handle/10324/25816
Derechos: info:eu-repo/semantics/openAccess
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