多用户远程语音交互终端接入设备设计与实现

基于低空飞行航空管制组网话音通信应用背景,从音频接口、模数/数模转换接口和网络接口3个核心处理模块出发,研究了网络化语音接入设备的硬件关键技术。从C语言级和汇编级两方面对G.729A语音编解码算法进行改进优化,并给出了语音数据的处理流程,以单片TMS320C6455DSP实时实现了语音4路压缩编码和20路解码处理。采用TCP/IP网络协议实现了多路语音网络通信功能,分析了多路语音串扰问题并设计了相应的解决方案。测试表明,基于该技术实现的设备语音处理延迟小于10 ms,满足多用户语音实时传输要求。

Design and implementation of a multi-user remote voice interactive terminal access equipment

This paper attempts to study the key technology of network voice access devices with focus on core modules,i.e.voice AD/DA conversion and network interface,according to the background of network voice communication in low altitude air traffic control(ATC). The G.729A voice encode and decode algorithm is optimized both in C and assembly language and flow chart of voice data processing is given.Four channels voice compression coding and twenty channels decode processing are also realized in real-time by single chip TMS320C6455DSP.The network multi-channel voice communication is realized with TCP/IP and multi-channel voice interpolation is solved with solutions accordingly.The test reveals that less than 10 ms time delay of the voice processing device is achieved,which meets the real-time voice transmission demand of multi-subscriber.