Performance Analysis on Beam-steering Algorithm for Parametric Array Loudspeaker Application
C.H. Wong, Zhan Wei Siew, Ismail Saad, Chien-Shiang Liau, Kenneth Tze Kin Teo · 2011
A highly directional audible sound can be generated based on the nonlinear interaction of the ultrasonic sound wave in air. The direction of this audible sound beam is controllable by utilizing array signal processing technique for parametric array. However, most of the existing work done is focused on the algorithm improvement of the steering angle or reduce the computational intensity, all of which does not consider the signal to noise ratio (SNR) of the system. Low SNR cases will cause clipping, distortion or even signal loss towards the audible sound generated by the parametric loudspeaker. In this paper, simulation and performance analysis is carried out to demonstrate the signal noise ratio for different weighting functions in the beam-steering algorithm of the parametric array loudspeaker.