车载紧急呼救系统语音通话质量测试方法研究

Research on Voice Call Quality Test Method of Vehicle Emergency Call System

该文介绍了一种车载紧急呼救系统语音通话质量测试的方法,包括介绍车载紧急呼救系统工作机制、语音通话质量测试重要性、搭建测试环境(模拟无线通信网络和公共安全应答点),简要地介绍了语音通话质量测试方法,通过信噪比纳和失真度定量评价通话质量,探索在EMC抗干扰试验中,采用该方法对被测车辆的紧急呼救语音通话功能做判断。

This paper introduces a method of voice call quality test of vehicle emergency call system,including the working mechanism of the on-board emergency call system,the importance of voice call quality test,setting up a test environment(simulating wireless communication network and public safety answer point),introducing the quality test method of voice call.Through the quantitative evaluation of signal-to-noise ratio and distortion,this method can be used to judge the emergency call voice function of the tested vehicle in EMC anti-interference test.