声源定位中广义互相关时延估计算法的研究  

Research on generalized cross correlation algorithm for time delay estimation in sound source localization

作　　者：茅惠达 张玲华[1] MAO Huida;ZHANG Linghua(College of Telecommunications & Information Engineering, Nanjing University of Post and Telecommunications, Nanjing 210003, China)

机构地区：[1]南京邮电大学通信与信息工程学院,南京210003

出　　处：《计算机工程与应用》2016年第22期138-142,共5页Computer Engineering and Applications

基　　金：江苏省高校自然科学研究重大项目(No.13KJA510003);江苏高校优势学科建设工程资助项目(PAPD)

摘　　要：基于时延估计(TDE)的声源定位算法是数字助听器中的核心算法之一,其估计精度会受到噪声和采样频率等因素的影响,导致了定位的不准确性。针对这一问题,结合相关峰精确插值算法(FICP),提出了一种基于二次相关改进的广义互相关时延估计算法。该算法通过二次相关,有效地降低噪声的干扰,再利用FICP,提高相关函数的分辨率。仿真实验表明,无论在低信噪比,还是在高信噪比环境下,改进算法的时延估计性能都有了明显改善。Sound source localization based on Time Delay Estimation(TDE)is one of the core of the algorithm in hearingaids. However, the estimation accuracy is often affected by the sampling rate and noise, which leads to the inaccuracy oflocation. In order to solve the problem, in this paper, combined with Fine Interpolation of Correlation Peak method(FICP), an improved generalized cross correlation algorithm based on second correlation is proposed. In the proposedmethod, second correlation is adopted to reduce the interference of noise, FICP is used to improve the resolution of correlationfunction. The simulation results show that under both low SNR and high SNR environments, the proposed methodcan improve the performance of time delay estimation significantly.

关 键 词：时延估计 广义互相关 二次相关 相关峰精确插值 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]