基于上升过零点检测的室内双传声器声源定位  

Dual- channel Sound Source Localization Based on Upward Zero- crossing Points Detection in Rooms

作　　者：曾向阳[1] 蔡怀珍 

机构地区：[1]西北工业大学航海学院,陕西西安710072

出　　处：《电声技术》2014年第2期26-30,共5页Audio Engineering

基　　金：国家自然科学基金项目(11374241);陕西省自然科学基金项目(2012JM1010)

摘　　要：提出了一种基于上升过零点检测的双传声器声源定位方法,该方法可以根据双传声器信号时间差样本的统计特性求得信噪比,再统计满足信噪比要求的可靠时间差样本,将其转换成对应的方位角样本,最后根据样本数量的统计分析结果确定声源方位。针对不同声源、信噪比及混响条件,在实际房间中进行了定位实验。结果显示:该方法对宽带声源具有更好的定位效果;定位精度受信噪比的影响很小,但受室内混响的影响显著。The problem of sound source localization is proposed based on upwards zero-crossing points detection with two microphones. SNR can be obtained by the statistical properties of the time difference samples, and then reliable time differ- ence samples can be selected according to the required SNR, finally, the time difference samples are transformed into azi- muth samples, consequently, the source azimuth is achieved by the analysis of the azimuth samples. Experiments are con- ducted with different sounds, and sounds with wider spectrum seem to perform more precisely. Evidence also shows that the method is robust to sound signals in different SNR, and experiments in different rooms reveal that reverberation apparently degrades the localization accuracy.

关 键 词：室内声源定位 时间差 过零点检测 混响 

分 类 号：TB54[理学—物理]