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基于IP网络的多媒体视频会议系统研究
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摘要
随着Internet/Intranet的迅速发展和普及,视频会议在工程设计、远程教学、商业会议等方面显示越来越广的应用前景。它同样在群体协作中发挥着重要作用,将多媒体视频会议系统引入决策支持系统环境,提高协作的效率成为我们项目的一个研究课题。
     本文的研究课题来源于十.五国防预研项目“面向军事作战规划的智能辅助决策技术研究”。论文选择设计、实现全互连的多媒体视频会议系统为研究对象,通过对视频会议国际标准、关键技术、产品的研究分析以后,在原有课题“多媒体合成作战指挥支持系统”的基础上,提出了一种基于IP网络的多点视频会议系统MPVC(Multipoint Videoconference)模型,给出了完整的设计方案和技术途径,实现了视频/音频流多点实时传输。提出了一种无MCU的会议管理模式,实现了控制与数据的分离,所有的音频混合及视频切换功能均由客户端计算机完成;提出了一种基于多通道的“单播+组播”传输方式,提高了系统的带宽利用率;并给出保证视频、音频回放的连续性、同步性的实现方法。
With the rapid development and popularization of Internet/Intranet, video conference has shown increasing application prospect in engineering design, distance education and business conference. It also plays an important role in GCW(Group Cooperation Work). How to introduce multimedia video conference to GDSS(Group Decision Support System) environment to improve collaboration efficiency is one research issue of our project.
    This dissertation focuses on the design and development of a fully-connected multimedia video conference system based on IP network technologies. Firstly, the international standards and key techniques of video conference are analyzed, as well as the advantages and disadvantages of present products. Secondly, MPVC, an IP-based multipoint videoconference system model, is given by theories and technologies of videoconference. Finally, the thesis presents complete design scheme and technique route, and implements multipoint real-time transportation of video/audio stream. This paper also presents a conference management pattern without MCU, making control and data separate. In order to enhance the bandwidth utilization factor, a multi-channel based transfer method, unicast plus multicast, is brought forward. In the end of this dissertation, we presents implementation methods, which guarantee the continuity and synchronization of video and audio when playbacking.
引文
1. R. Steinmetz, K. Nahrstedt. Multimedia computing, communications and applications. Prentice-Hall International, Inc.
    2. H. Schulzrinne, S. Casner, R. Frederick, and V. Jacobson. RTP: Atransport Protocol for Real-time Applications. RFC 1889, December0 5, 1997.
    3. Implementor's Guide for ITU-T Recommendation H. 263 ITU-T
    4. ITU-T Recommendation H. 263 ITU-T 1997.09.26
    5. Borko Furht. Multimedia Broadcasting over the Internet IEEE 1999.01
    6. RFC1890 RTP Profile for Audio and Video Conferences with Minimal Control IETF Audio-Video Transport Working Group
    7. Data Protocols for Multimedia Conferencing Draft Recommendation T. 120 ITU-T 1995.09
    8. Draft Recommendation H. 323 ITU-T 1996.05.28
    9. Microsoft NetMeeting 3.0 SDK http://www.microsoft.com/netmeeting
    10. Alex Krassel, Steve Robinson. Microsoft NetMeeting2.1 COM Interfaces 1998.04.10
    11.李伟华,多媒体群体决策支持系统理论.方法.应用,西北工业大学出版社,2001.03
    12.李伟华,基于局域网络的群体决策支持系统及其开发平台研究,博士论文,1998
    13.张明敏,网络多媒体技术与应用,清华大学出版社,1998
    14.张明德、王永东,视频会议原理及应用,北京希望电子出版社,1999.08
    15.汤庸、魏际州,音频和视频协同工作机制及实现的研究,软件学报,1998.09
    16.分布式多媒体协同工作系统(DMCS)原理,西安交通大学系统工程研究所,1996.11
    17.多媒体合成作战指挥支持系统,鉴定资料,西北工业大学,1997.12
    18.David L.Stevens,用TCP/IP进行网际互联第三卷,电子工业出版社,2001.04
    19.蒋东兴,Windows Sockets网络程序设计大全,清华大学出版社,1999.11
    20.Anthony Jones、Jim Ohlund,Windows网络编程技术,机械工业出版社,2000.03
    21.Kate Gregory,Visual c++6.0开发使用手册,机械工业出版社,1999.02
    22.陈默、王晓东,在Windows 98/NT下实现H.323终端,电子技术,2001.04
    23.张载龙、沈苏彬,因特网多媒体会议系统研究,南京邮电学院学报,2001.3
    24.任继平,应用SOCKET实现网络通信,电脑编程技巧与维护,2001.4
    25.胡毅、柴乔林、胡咏梅,分布式多媒体交互系统音频/视频流传输的设计与实现,计算机工程与科学,
    26.季兵、季晓勇、马江波,基于PC的数字视频通信系统的实现,计算机应朋研究,2001.4]

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