RT info:eu-repo/semantics/conferenceObject
T1 Characterization of a Virtual Array based on MEMS microphones for the analysis of acoustic sources
A1 Izquierdo Fuente, Alberto
A1 Villacorta Calvo, Juan José
A1 Val Puente, Lara del
A1 Suarez Vivar, Luis
K1 Acoustic array systems
K1 Microphones
K1 Microelectromechanical systems
K1 Spatial resolution
K1 Spatial dimensions
AB 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.
PB The Journal of the Acoustical Society of America
YR 2017
FD 2017
LK http://uvadoc.uva.es/handle/10324/25816
UL http://uvadoc.uva.es/handle/10324/25816
LA eng
NO Boston MA (USA), 25–29 June 2017
NO Producción Científica
DS UVaDOC
RD 22-nov-2024