基于端点检测的精确时延提取方法及其定位精度分析

Endpoint detection based accurate time delay extraction method and its positioning accuracy analysis

针对脉冲声源定位中时延误差大的问题,提出了一种基于端点检测的精确时延提取方法。该方法首先对信号进行滤波处理和端点检测,截取有效信号段运用广义互相关法估计时延,然后利用端点检测得到的信息提取出精确的时延值,最后用单纯形替换法求解声源位置。根据精确时延提取方法,设计了声源定位方案。实验证明,该方法能有效减弱非高斯白噪声和室内混响的影响,定位精度可达到分米甚至厘米级,并且具有较好的鲁棒性。

An accurate time delay extraction method based on endpoint detection is proposed to solve the problem of large time delay error in pulse sound source location.In this method,the signal filtering and endpoint detection are performed firstly,and then the effective segment is intercepted and the time delay is estimated by generalized cross-correlation(GCC)method.The accurate time delay is extracted by using the information obtained by the endpoint detection,and the sound source position is solved by the simplex substitution method.Based on the accurate time delay extraction method,a sound source positioning scheme is designed.Experimental results show that this method can effectively reduce the influence of non-Gaussian white noise and indoor reverberation,and the positioning accuracy can be up to decimeter or even centimeter with better robustness.