Liu Xin, Hu Xinyu, Cai Chen, Wang Haibo, Qi Zhi-Mei
State Key Laboratory of Transducer Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100190, China.
School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 100049, China.
J Acoust Soc Am. 2024 Aug 1;156(2):783-791. doi: 10.1121/10.0028131.
Traditional sound source localization (SSL) systems based on electret condenser microphone arrays are bulky because their localization accuracy depends on the size of the array. Inspired by the hearing mechanism of the parasitic fly Ormia ochracea, the localization accuracy of miniature bionic SSL devices breaks through the limitations of device size, but their ability to localize low-frequency sound sources over a wide angular range remains a challenge. In this work, a compact low-frequency SSL system with an extended directional range was prepared using two bionic micro-electro-mechanical system diaphragm based fiber-optic microphones, which form a non-coplanar array with a size of Φ44 mm × 13 mm. An algorithm for quantifying the azimuthal angle of a sound source is established for the prepared SSL system. Simulation and experimental results show that the prepared SSL system is capable of determining the propagation direction of acoustic signals with a frequency of less than 1 kHz in the azimuthal range from -90° to 90°, with a linear response in the range from -70° to 70°, and an angular measurement accuracy of the system within the range of ±7°.
基于驻极体电容传声器阵列的传统声源定位（SSL）系统体积庞大，因为其定位精度取决于阵列的大小。受寄生蝇奥氏按蚊听觉机制的启发，微型仿生SSL设备的定位精度突破了设备尺寸的限制，但其在宽角度范围内对低频声源的定位能力仍然是一个挑战。在这项工作中，使用两个基于仿生微机电系统振膜的光纤麦克风制备了一个具有扩展方向范围的紧凑型低频SSL系统，这两个麦克风形成了一个尺寸为Φ44 mm × 13 mm的非共面阵列。为制备的SSL系统建立了一种用于量化声源方位角的算法。仿真和实验结果表明，制备的SSL系统能够在方位角范围从-90°到90°内确定频率小于1 kHz的声信号的传播方向，在-70°到70°范围内具有线性响应，并且系统的角度测量精度在±7°范围内。
