Authors V. A. Voronin, E. A. Kazakova
Month, Year 06, 2018 @en
Index UDC 534.222.2
Abstract The features of the emission of acoustic signals in air by a parametric radiating array are discussed. The methods for the formation of waves interacting in a nonlinear medium are given and their advantages and disadvantages are revealed. To build a voice information system with a narrow sound beam, it was proposed to use a parametric array with an amplitude-modulated pump signal. To implement a parametric array in air, it is proposed to use highly sensitive loudspeakers in the radiation mode as transducers in the pump array. For a uniform distribution of acoustic energy at the surface of the pumping array is proposed to use acoustic horns. When calculating the parameters of the nonlinear interaction of acoustic waves, the passport data of the selected loudspeakers are used. An expression for calculating the amplitude modulation coefficient for a selected range of difference frequencies is derived. The influence of the amplitude modulation coefficient on the level of generation of secondary acoustic waves in space is shown. The results of the calculation of the axial distribution of sound pressure at various difference frequencies are given. Calculated the characteristics of the directivity of the pumping antenna. Theoretical calculations are confirmed by experimentally measured characteristics of the directivity of the pump array in air at different pump frequencies. Recommendations are given on the use of a parametric array for transmitting speech in air.

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Keywords Parametric array; air environment; amplitude modulated signal; pump converter; nonlinearity.
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