RTP流音频回放技术在400 MHz数字列调系统中的应用  

Application of RTP Stream Audio Playback Technology in 400 MHz DRTD System

作　　者：赵文杰 Zhao Wenjie(CRSC Research&Design Institute Group Co.,Ltd.,Beijing 100070,China)

机构地区：[1]北京全路通信信号研究设计院集团有限公司,北京100070

出　　处：《铁路通信信号工程技术》2023年第12期43-46,共4页Railway Signalling & Communication Engineering

摘　　要：介绍DRTD系统中无线列调语音业务的音频回放技术。DRTD系统有线通信基于SIP协议和R T P流进行音频传输,通过混音、加窗语音检测、缓存、格式转换、信令控制等处理流程,将音频流在无线空口上进行传输,并最终在移动终端上实现语音波形回放,从而桥接无线列调中的有线通信和无线通信,为DRTD系统的核心业务提供支撑。This paper introduces the audio playback technology for wireless voice services in the DRTD system.The wired communication of the DRTD system is based on the SIP protocol and RTP stream for audio transmission.The audio stream is transmitted via the wireless air interface through such processing processes as mixing,windowing based VAD,caching,format conversion,and signaling control,and fi nally voice waveform playback is achieved at the mobile terminal,thus bridging the wired communication and wireless communication in the train dispatching communication and providing support for the core services of the DRTD system.

关 键 词：400 MHz数字列调系统 实时传输协议 音频回放 语音活动性检测 

分 类 号：U285[交通运输工程—交通信息工程及控制]