基于互相关函数的电声系统延时测量方法  

Delay measurement method of electro-acoustic system based on cross-correlation function

作　　者：王杰[1] 杨广权[1] 王谢谢 黄曼露 颜霖煌 

机构地区：[1]广州大学机械与电气工程学院,广东广州510006

出　　处：《广州大学学报（自然科学版）》2017年第5期1-6,共6页Journal of Guangzhou University:Natural Science Edition

基　　金：国家自然科学基金资助项目(61302126;51275099);广东省教育厅特色创新资助项目(2014KTSCX095);广东省教育厅工程技术研究中心资助项目(GCZX-A1407);广东省高等学校优秀青年教师培养计划资助项目(Yq201403);广州市重点实验室资助课题(201605030014)

摘　　要：测量电声系统从信源播放信号到播放的声音最终到达观众的延时是非常有意义的,这对于各场馆的电声系统搭建以及场馆内各扬声器的延时调整与校正具有重要的作用.文章提出一种基于互相关函数的电声系统延时测量方法,在信源处播放的测试信号,通过对测试信号与观众处声场麦克风接收的信号进行采集与模数转换,并计算2者的互相关函数,得出函数峰值处对应的采样点数值,再根据模数转换器的采样频率计算出延时的时间.文章对实际存在的系统噪声以及系统中混响的影响进行了仿真分析,仿真结果证明了所提出的测量方法具有良好的适用性.It is very sognificant to measure electrical-acoustic playback signal from the source system to the final sound playback viewer delay cant in the electro-acoustic system and delay adjustment. In this paper,a method of delay measurement of electro-acoustic system based on cross correlation function is proposed. The test signal broadcasted at the source and the signal received by microphone in the audience are collected and converted into digital signals,and the peak value of their cross-correlation function corresponds to the delay time. The simulation results show that the proposed method has good applicability.

关 键 词：延时测量 互相关函数 电声系统 

分 类 号：TN912.2[电子电信—通信与信息系统]