Modeling the directivity of parametric loudspeaker

Shi, Chuang and Gan, Woon-Seng (2012) Modeling the directivity of parametric loudspeaker. Kamakura, Tomoo and Sugimoto, Nobumasa (eds.) In AIP Conference Proceedings: NONLINEAR ACOUSTICS STATE-OF-THE-ART AND PERSPECTIVES: 19th International Symposium on Nonlinear Acoustics. vol. 1474, pp. 379-382 . (doi:10.1063/1.4749373).

Record type: Conference or Workshop Item (Paper)

Abstract

The emerging applications of the parametric loudspeaker, such as 3D audio, demands accurate directivity control at the audible frequency (i.e. the difference frequency). Though the delay-and-sum beamforming has been proven adequate to adjust the steering angles of the parametric loudspeaker, accurate prediction of the mainlobe and sidelobes remains a challenging problem. It is mainly because of the approximations that are used to derive the directivity of the difference frequency from the directivity of the primary frequency, and the mismatches between the theoretical directivity and the measured directivity caused by system errors incurred at different stages of the implementation. In this paper, we propose a directivity model of the parametric loudspeaker. The directivity model consists of two tuning vectors corresponding to the spacing error and the weight error for the primary frequency. The directivity model adopts a modified form of the product directivity principle for the difference frequency to further improve the modeling accuracy.

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