Journal
APPLIED ACOUSTICS
Volume 71, Issue 9, Pages 793-800Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.apacoust.2010.04.004
Keywords
Parametric loudspeaker; Near-field; Directivity; Attenuation; Spurious signal
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A parametric speaker is a device for generating and focusing highly directional sound beams. It is essentially a by-product that comes with the nonlinearity of ultrasound. It is noteworthy that this directional beam was controlled and utilized mostly for far-field applications in the past. We empirically study the directivity and attenuation characteristics of the parametric loudspeaker in the near-field where we desire to use it. Physical parameters for experiments are imported from a theoretical model based on the far-field approximation. The findings are that increases in aperture size and modulation frequency cause higher directivity, but have more than twice the beamwidth of the far-field approximation. The attenuation also does not obey the inverse-square law which describes far-field spreading from acoustic sources. The results conclusively explain a series of formation and attenuation of the virtual sound sources and define limitations of use in the near-field. (C) 2010 Elsevier Ltd. All rights reserved.
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