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- W2553711261 abstract "Measurement of acoustic properties of materials, such as absorption and reflection coefficient in a free field, has the results largely affected by diffraction by the sample edge. In order to minimize this, the use of a parametric loudspeaker, which enables to produce a directional audible sound by using the nonlinear effect of sound beams based on the parametric array theory, is investigated. At first, the directivity and the distance attenuation were measured as fundamental characteristics of the sound source. Then, the directivity of reflected sound from a surface, flat and diffuser plate, under oblique incidence conditions was measured in an anechoic chamber. The data were compared with those obtained by an experiment using a conventional loudspeaker, and with a wave-based numerical analysis using the mode matching method. The results show that the narrow sound directivity of the parametric loudspeaker is capable of obtaining the directivity properties of reflection sound from the plates more accurately than a conventional loudspeaker." @default.
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- W2553711261 date "2016-10-01" @default.
- W2553711261 modified "2023-10-04" @default.
- W2553711261 title "A trial on the measurement of the acoustic properties by using a parametric loudspeaker" @default.
- W2553711261 doi "https://doi.org/10.1121/1.4970989" @default.
- W2553711261 hasPublicationYear "2016" @default.
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