【作者】 王相庆；

【导师】 吴宇红；

【作者基本信息】 西安电子科技大学 ， 通信与信息系统， 2008， 硕士

【摘要】 论文对新兴VoIP协议IAX做了深入的研究和学习,并在掌握其工作原理、工作过程的基础上,对协议进行了扩展,使原协议支持多方视频通信的功能,对多方视频通信的呼叫流程、会话控制进行了详细的设计。对IAX协议源代码进行了系统的整理、优化,并且开发了多方视频通信模块。论文对VoIP系统中的关键技术进行了研究和分析,为了解决视频会议中多路视频数据占用带宽量大的问题,提出了个人视角视频会议的概念,结合静音检测技术,实现视频会议中语音数据和视频数据的同步传输,并在实验室环境中成功实现了个人视角视频会议系统,测得了大量有效数据。在研究VoIP系统的基础上,提出了高速局域网视频通信平台解决方案;对视频会议的系统结构、应用模式、功能模块等进行了系统研究和架构。局域网视频通信平台以VoIP技术为基础,以主席控制模式的视频会议为主要功能,并且与数据通信、程序共享、电子白板等辅助功能相融合,最终初步构建了一个软件视频通信平台。更多还原

【Abstract】 This paper has a thorough ananlysis and research to the new VoIP protocol-IAX. IAX protocol is expanded partly according to its basic principle and proceeding. A new function multiple video communications is added into this protocol. Source code of IAX protocol is programmed, optimized and encapsulated to supply API (application programming interface) for further project development and the multiple video communications module is carried out.Key technologies of VoIP system are studied in this paper. A new concept of Personal View Video Conference is put forward to resolve the problem of too much bandwidth used in the video conference system. VAD (voice activity detection) technology is used to carry out the synchronized transfer of voice data and video data. At last, a successful Personal View Video Conference system is constructed in the lab and much useful testing data are obtained.A system of Video Communication Platform in high speed LAN is brought out on the base of VoIP system. A thorough research is made on the system structure, applicating modes and function modules of video conference system. A software Video Communiaction Platform is constructed in the form of chairman controlling multi-parts video conference system supplying many assistant functions such as data communication, program sharing, white board and so on.更多还原