SDP2327

Portable Unix Libary

本文主要研究了W-WAN中GPRS网络的移动视频传输问题。文中探讨了GPRS的网络结构、协议体系以及链路特性，从中我们看出： GPRS网络链路不仅具有一般无线链路数据传输中遇到的延迟大、误码率高等共性问题，而且具有移动通信系统采用蜂窝频率复用方式带来的小区切换， 以及由于通信中链路性能随着地理位置变换而变化造成的GPRS网络中不可避免的经常性遭遇的冗长时延和突变时延。 这使得目前GPRS网络中使用的传统TCP或UDP传输协议均不能适应GPRS自身的链路特性，也不能实现高效的分组传输。-This paper mainly studied the W-WAN in the GPRS network for mobile video transmission problems. The article discusses the GPRS network architecture, protocol architecture, as well as link characteristics, from which we can see: GPRS network link not only has the general wireless link data transmission delay encountered in large, common problems of higher bit error rate, and with mobile communications system uses a cellular frequency reuse methods brought about by cell switching, as well as the communication link performance with the location change and change is inevitable GPRS network, the recurrent encountered lengthy delay and delay mutation. This makes the current GPRS network using the traditional TCP or UDP transport protocol are una

h.323协议的中文版，共三部分，可以作为多媒体业务的通信规范-the Chinese version of the h.323 agreement, including three parts, can serve as a multimedia business communications standards

系列工具的提供 这行的一定要看！-series of tools that provide a look at the OK!

sip관 련 소 스 인 데 많 이 참 조 하 여 주 세 요 -sip관 련 소 스 인 데 많 이 참 조 하 여 주 세 요

实现网络在线语音对话.支持GSM编码,ADPCM编码,LPC编码,LPC-10编码 支持RTP,vat协议,并有广播发送,按组进行多点传送,文字交谈等功能-voice network online dialogue. GSM code, ADPCM encoding, LPC coding, LPC-10 encoding support RTP, vat agreement, and this is the broadcasting, according to multicast group, writing features such as conversation

ITU的g729a编码库，可以将pcm转化为g.729格式-ITU G729 annex A lib file ,can transfer PCM file format to G729 format.

该程序可以用于两个人在LAN/Intranet(或者Internet)上进行视频会议。现在有许多视频会议程序，每个都有各自的性能提升技术。主要的问题是视频会议视频帧的尺寸对于传输来说太大。因此，性能依赖于对帧的编解码。 -the two procedures can be used in LAN/Intranet (or the Internet) for video conferencing. Now there are many video conference proceedings, each have their own performance enhancements. The main problem is video conferencing video frame size too large for transmission. Therefore, the performance depends on the right frame codec.

sip的学习参考文档，对初学sip的用户有较高的参考价值-sip learning reference documentation for novice users sip has a high reference value