汽车鸣笛声定位系统仿真

提出了一种汽车鸣笛声定位系统用以协助执法部门锁定违章鸣笛车辆。该系统采用分布在立体空间的五元麦克风阵列,整个定位系统由三个模块组成。首先根据鸣笛声的频域特性检测出信号,然后基于广义互相关理论计算到达各麦克风信号的时延差,并通过对多次估计求均值提高时延估计的准确性。最后利用闭式球形插值算法得到声源位置信息。仿真结果表明该系统可以有效地定位汽车鸣笛声,为实际的系统实现提供了一次初步探讨。

Simulation of car horn localization system

A system for car horn location which aims to helping agency to supervise the illegal car is proposed. The system consists of a 5-element microphone array and its algorithm is implemented in three modules. The first step is to detect the signal by the traits of the car horn in frequency domain. Then the time delay estimation (TDE) for microphone arrays is determined by generalized cross correlation (GCC), and the average of the estimations is calculated to improve the accuracy. Finally closed Spherical Interpolation (SI) is implemented to obtain the location of car horn. The simula-tion results indicate that the system effectively gets the location of car horn, thus provides a theoretical foundation for future implementation.