Theoretical And Experimental Analysis Of The Electromechanical Behavior Of A Compact Spherical Loudspeaker Array For Directivity Control.

dc.creatorPasqual, Alexander Mattioli
dc.creatorHerzog, Philippe
dc.creatorArruda, José Roberto de França
dc.date2010-Dec
dc.date2015-11-27T13:18:27Z
dc.date2015-11-27T13:18:27Z
dc.date.accessioned2018-03-29T01:12:00Z
dc.date.available2018-03-29T01:12:00Z
dc.identifierThe Journal Of The Acoustical Society Of America. v. 128, n. 6, p. 3478-88, 2010-Dec.
dc.identifier1520-8524
dc.identifier10.1121/1.3500689
dc.identifierhttp://www.ncbi.nlm.nih.gov/pubmed/21218880
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/199142
dc.identifier21218880
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1299375
dc.descriptionSound directivity control is made possible by a compact array of independent loudspeakers operating at the same frequency range. The drivers are usually distributed over a sphere-like frame according to a Platonic solid geometry to obtain a highly symmetrical configuration. The radiation pattern of spherical loudspeaker arrays has been predicted from the surface velocity pattern by approximating the drivers membranes as rigid vibrating spherical caps, although a rigorous assessment of this model has not been provided so far. Many aspects concerning compact array electromechanics remain unclear, such as the effects on the acoustical performance of the drivers interaction inside the array cavity, or the fact that voltages rather than velocities are controlled in practice. This work presents a detailed investigation of the electromechanical behavior of spherical loudspeaker arrays. Simulation results are shown to agree with laser vibrometer measurements and experimental sound power data obtained for a 12-driver spherical array prototype at low frequencies, whereas the non-rigid body motion and the first cavity eigenfrequency yield a discrepancy between theoretical and experimental results at high frequencies. Finally, although the internal acoustic coupling affects the drivers vibration in the low-frequency range, it does not play an important role on the radiated sound power.
dc.description128
dc.description3478-88
dc.languageeng
dc.relationThe Journal Of The Acoustical Society Of America
dc.relationJ. Acoust. Soc. Am.
dc.rightsfechado
dc.rights
dc.sourcePubMed
dc.subjectAcoustics
dc.subjectAlgorithms
dc.subjectAmplifiers, Electronic
dc.subjectComputer Simulation
dc.subjectEquipment Design
dc.subjectMembranes, Artificial
dc.subjectModels, Theoretical
dc.subjectMotion
dc.subjectPressure
dc.subjectSignal Processing, Computer-assisted
dc.subjectSound
dc.titleTheoretical And Experimental Analysis Of The Electromechanical Behavior Of A Compact Spherical Loudspeaker Array For Directivity Control.
dc.typeArtículos de revistas


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