基于圆形麦克风阵列的声源定位改进算法

Improved Algorithm of Sound Source Localization Using Circular Microphone Array

针对波达方向估计中传统互功率谱法声源方位估计准确性差、方位模糊的问题,提出了一种基于圆形麦克风阵列的声源定位改进算法,并进行了实验验证。在该改进算法中,先设计了十二元圆形麦克风阵列,由麦克风对接收语音信号的时延与相位得到相位旋转因子,再将其引入到语音信号的互功率谱中,新定义了圆形集成互功率谱,由该功率谱进行声源方位估计。仿真与实测实验结果表明,本文的圆形集成互功率谱法对声源方位进行估计,估计的准确度高于传统互功率谱法。

In view of the problems of inaccurate localization and ambiguous orientation of traditional cross power spectrum（CS）in direction of arrival estimation,an improved algorithm of sound source localization using a circular microphone array is proposed and demonstrated by practical experiments.In the proposed algorithm,the twelve-element circular microphone array is firstly designed,then the phase rotation factor is defined by combining the time delay with the phase information of speech signals received by each pair of microphone and introduced into the traditional cross power spectrum to define novel circular integrated cross power spectrum（CICS）,finally the sound source orientation can be estimated by CICS algorithm.The simulation and practical experiment results show that the proposed algorithm can greatly improve the estimated accuracy of source orientation compared with the traditional cross spectrum algorithm.