Beamwidth Control in Parametric Acoustic Array
Authors:
- Jun YangJYJun Yang
- Khim-Sia TanKTKhim-Sia Tan
- Woon-Seng GanWoon-Seng Gan
- Meng-Hwa ErMEMeng-Hwa Er
- Yong-Hong YanYYYong-Hong Yan
- 1 September 2005
- journal article
- Published by IOP Publishing in Japanese Journal of Applied Physics
- Vol. 44 (9R)
Abstract
Directional sound can be generated by amplitude-modulating the ultrasound carrier wave with an audio signal and then transmitting it from an array system. On the basis of the analysis of its radiation pattern, an algorithm using delay-and-sum beamforming is proposed to control the beamwidth and sidelobe of demodulated audible sound. Simulation results show that enhanced performance in terms of sidelobe level can be achieved by using the Chebyshev weighting function, compared with the beamforming algorithm without shading.Keywords
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