基于球麦克风阵列的多声源定位方法

Localization of multiple acoustic sources based on spherical microphone arrays

通过球麦克风阵列采集高阶声场的声压信息,采用球谐函数分解声场并建立信号模型,应用MUSIC算法提取出声源的方位。由于MUSIC算法在信号源相干性比较高,特别是声源比较接近时,其分辨率会严重下降,提出了一种基于空间平滑的瓣分块方法来提高定位的效果。仿真实验采用了一个72元的球阵,实验结果表明:提出的方法能同时有效地确定声场中多个声源的位置,能比较好地对抗噪声的影响。

In this paper sound pressure is sampled through spherical microphone array.Sound field can be decomposed by spherical harmonics and a signal model is built.Based on the model,MUSIC algorithm is adopted to estimate the positions of multiple acoustic sources.However this method fails when the signals are coherent,especially near to each other.Therefore a new petal-blocking method is proposed based on spatial smoothing to improve localization effect.A 72-element spherical microphone array is applied to the simulation.The results show that this method can localize multiple coherent sources and resist noise.