Institutional Repository
| 多点多媒体通信系统--多点多媒体会议控制器的实现 | |
| 王涛 | |
| Major | 计算机软件 |
| 1998 | |
| Degree Grantor | 中国科学院软件研究所 |
| Degree Level | 博士 |
| Place of Degree Grantor | 中国科学院软件研究所 |
| Keyword | 多点 对象 多媒体 线程 同步 消息 事件 会议 信道 令牌 广播 |
| English Abstract | 近年来，随着微型计算机的功能越来越强大，数字技术在通信网络中的广泛应用，多媒体时代离我们越来越近了。允许多个使用者同时参加，协同工作的多媒体通信系统的快速发展对通信网络，通信协议等都提出了一些新的要求。多媒体会议系统是一种常见的多媒体通信系统，它的功能没有确切的规定。一般来说，一个多媒妁体会议系统包括白板、文字对话、多点文件传送、多点音频信号和视频信号传送等子系统。ITU-T T.120系列协方式是由国际电信联合会电信标准化小组制定的，这些协议包括一系列支持实时、多点数据通信及应用的协议和服务。T120系列协议是专门为异质网络环境下的多媒体通信应用和服务而设计的，它可以在多种不同的网络上实现，例如公共交换电话网（PSTN）、综合业务数字网（ISDN）、电路交换数字网（CSDN）和宽带ISDN网（B-ISDN）。对其它网络的支持，例如局域网（LAN）、TCP/IP和异步传输模式网（ATM）等，也正在考虑或者开发之中。T120系列协议中定义了几个应用层协议：可视音频控制标准（T.AVC)、多点二进制文件传送协议（T.MBFT 或 T.127)、白板和静态图象交换协议（T.SI 或 T.126)。本文讨论的是如何利用Windows Socket技术为基于T120系列协议的上层应用程序（白板和文件传输）提供类似于T120协议规定的会议管理和数据广播的功能。本文着重分析了原有系统的特点，讨论了使用Windows Socket技术、多线程技术、面向对象技术等实现多点多媒体会议控制器的具体过程。并对这些技术的特点以及对协议性能的影响作了分析。 |
| Abstract | In these years, along with the tremendous progress of the personal computer and wide application of digital technology in communication network, multimedia age is coming steadily. The rapid developing of multimedia communication system which allow multi-user work cooperatively raise many new demands on communication network and protocol. Multimedia conferencing system is a kind of wide-used multimedia communication system. Its function is not clearly defined but it should include white board, text conversation, multipoint file transfer, multipoint AV information transfer etc. Established by International Telecommunication Union, ITU-T T120 series protocol contains a series of protocols and services which support real time, multipoint communication application. T120 series protocols is specially designed for the multimedia communication applications and services on heterogeneous networks. They can be realized on many different networks, such as:PSTN, ISDN, CSDN, and B-ISDN. The support for other type of networks, such as LAN, TCP/IP, and ATM is under consideration. There are several application protocols in T120 series protocols: audio-visual control protocol (T.AVC), multipoint binary file transfer protocol (T.MBFT or T.127), white board and still image exchange protocol (T.SI or T.126). This thesis discusses how to realize the functions of conference management and data multicast for applications (including White Board and File Transfer) which are based on T.120 series protocols using Windows Socket technology. The paper fisrt discusses the characteristics of the original system which is based on T.120 series protocols, then discusses the procedure of realization with technologies such as Windows Socket, multi-thread, and Object-Oriented Programming. This article also briefly analyzes the affection of adoption of these technologies to the performance of the protocol. |
| Pages | 50 |
| Language | 中文 |
| Content Type | 学位论文 |
| URI | http://ir.iscas.ac.cn/handle/311060/6116 |
| Collection | 中科院软件所_中科院软件所 |
| Recommended Citation GB/T 7714 | 王涛. 多点多媒体通信系统--多点多媒体会议控制器的实现[D]. 中国科学院软件研究所. 中国科学院软件研究所,1998. |
| Files in This Item: | ||||||
| File Name/Size | DocType | Version | Access | License | ||
| N98841.pdf（2943KB） | 限制开放 | -- | Application Full Text | |||
Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.
Edit Comment