Beamwidth Control in Parametric Acoustic Array
Jun Jie Yang, K.S. Tan, Woon‐Seng Gan, Meng-Hwa Er, Yonghong Yan · Japanese Journal of Applied Physics · 2005
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.