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Title: Characterization of a Virtual Array based on MEMS microphones for the analysis of acoustic sources
Authors: Izquierdo Fuente, Alberto
Villacorta Calvo, Juan José
del Val Puente, Lara
Suarez Vivar, Luis
Conference: Acoustics’17 Boston: 173rd Meeting of the Acoustical Society of America and the 8th Forum Acusticum
Issue Date: 2017
Publisher: The Journal of the Acoustical Society of America
Physical Description : 52p
Description: Producción Científica
Citation: Boston MA (USA), 25–29 June 2017
Abstract: 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.
Classification: Acoustic array systems
Microelectromechanical systems
Spatial resolution
Spatial dimensions
Sponsor: MINECO/FEDER, UE TEC 2015-68170-R
Language: eng
Rights: info:eu-repo/semantics/openAccess
Appears in Collections:DEP71 - Comunicaciones a congresos, conferencias, etc.

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