基于TDOA的声源定位系统设计

Design of Sound Source Localization System Based on TDOA

目前,声源定位在机械故障诊断、电力状态检测及带压气体泄漏检测中应用比较广泛。考虑易实现和高精度两项指标,本文提出了一种基于到达时间差(Time Difference of Arrival,TDOA)算法的声源定位系统。基于TDOA算法获得4个声传感器之间的相对时间差,接收特定频率的声波信号,采用平面四元十字阵列建立的声传感器阵列实现位置解算,从而获得声源坐标。该系统综合应用锁相环路、51单片机和运算放大器等元器件,利用C51语言编写代码,实现了对于特定频率声源的定位。实践测试表明,该声源定位设备在空旷环境下较易实现低误差的声源定位,且具有较高的声源定位精度。

At present,sound source localization is widely used in mechanical fault diagnosis,electric power condition monitoring,and detection of pressurized gas leakage.Considering the two indicators of easy implementation and high accuracy,a sound source localization system based on Time Difference of Arrival(TDOA)is proposed in the paper.Based on TDOA algorithm,the relative time difference between four acoustic sensors is obtained,and the acoustic signal of a specific frequency is received.The acoustic sensor array established by a planar quadratic cross array is used to realize the position calculation,so as to obtain the sound source coordinates.The hardware system integrates phase-locked loop,51 microcontroller and operational amplifiers,and the software is written in C51 language to achieve the localization of specific frequency sound source.The practical tests show that the sound source localization device can easily achieve sound source localization with low error in open environments,and has high precision of sound source localization.