近轴近似
扬声器
参数统计
梁(结构)
声学
高斯分布
参数化阵列
高斯光束
计算机科学
物理
光学
数学
量子力学
统计
作者
Tao Zhuang,Jiaxin Zhong,Feng Niu,Mahmoud Karimi,Ray Kirby,Jing Lü
出处
期刊:Journal of the Acoustical Society of America
[Acoustical Society of America]
日期:2023-01-01
卷期号:153 (1): 124-136
被引量:1
摘要
A steerable parametric array loudspeaker (PAL) aims to steer a highly directional audio beam without the need to mechanically rotate the source. The Gaussian beam expansion (GBE) method is often used to model PALs because it is a computationally efficient approach, however the method relies on a paraxial approximation that can result in significant inaccuracies at large steering angles. To address this limitation, a steerable non-paraxial GBE is proposed in this article, where the mainlobe of the steered ultrasonic beam is included in the calculation by rotating the coordinate system. A non-paraxial approximation is then used to improve the accuracy of the method when integrating the virtual audio sources. The numerical results obtained using the proposed method are compared against those using the conventional GBE, as well as an exact solution. For a typical configuration, it is shown that for a conventional GBE the prediction error can be more than 30 dB at large angles, whereas the proposed method reduces this to less than 1 dB. The advantage of the proposed method is more significant at large steering angles, low audio frequencies, and those locations outside of the paraxial region. This improvement in performance is achieved with a computational cost that remains the same as the conventional GBE.
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