In the protocol , a hierarchy is currently used to manage the peers in the system , and a multicast path , which adapts to the request of delay and bandwidth , is constructed for the data transfer of media streaming 协议中利用分层拓扑结构来组织和管理应用层组播网络中的节点，在此基础上构建满足流媒体数据传输对延迟、带宽要求的组播路径。
This paper is to research into the transmission technology for p2p - based media streaming of application layer multi - cast in a tree structure so as to ensure the computer to deliver the same data to the users without forming data storm 摘要研究了应用层组播的p2p流媒体传输技术，给出了应用层组播树的结构，使得树的结构能够保证用户计算机不互相传送同样的数据而形成数据风暴。
With audio as master media stream and video as slave stream , the scheme makes a comparison between the presentation time stamp of the audio frame and the video frame which are played back recently to synchronize the presentation of video sequence with audio sequence 并以音频流为主媒体流，视频流为从媒体流，比较最近播放的音频帧和视频帧的播放时间标签，调整视频帧的播放持续时间来取得音视频媒体间同步。
To complement its solutions , the company has signed up with top layer networks , infolibria and comtrend in the development of secure network solutions , multi - media streaming and content distribution solutions as well as access solutions with copper technologies 公司为提供更完备的网络方案，与top layer networks infolibria及comtrend签订合约，合作发展保安网络方案多媒体即时传送内容发布方案，以及利用铜线技术发展上网方案。
To complement its solutions , the company has signed up with top layer networks , infolibria and comtrend in the development of secure network solutions , multi - media streaming and content distribution solutions as well as access solutions with copper technologies 公司为提供更完备的网络方案，与toplayernetworks 、 infolibria及comtrend签订合约，合作发展保安网络方案、多媒体即时传送、内容发布方案，以及利用铜线技术发展上网方案。
With the rapid development of the technology of internet , the way of information communication which represents the future trends might have the character of real - time processing , mutual responding and media stream multiplexing . multimedia application might have a bright future . the research and realization of the technology of stream media have been the hotspot 随着互联网技术的快速发展,实时、交互、多种媒体形式的信息通信方式成为未来信息化发展的必然趋势,基于互联网络的多媒体应用具有很好的发展前景,流媒体技术及其应用也成为研究热点。
In order to enhance the bandwidth utilization factor , a transfer method based on multi - channel is presented . both the transmission of real - time media stream and time - stamp technologies are introduced to the system to ensure the requirement of real - time characteristic and synchronism , and a simple protocol based on rtp ( real - time transfer protocol ) and udp ( user datagram protocol ) is designed . the method , event simulcast , is also brought forward to reduce the data redundancy and expand the collaboration scale of the system 本文给出了远程教学的协同工作环境模型；设计中为了提高系统带宽利用率，采用一种更符合实际应用要求的“单播+广播”的有效通信方式；为了解决音视频同步问题，参考实时媒体流和时间戳同步技术，设计了一个基于用户数据报协议udp和实时传输协议rtp的简单传输协议，实际应用中保证了数据的实时性和同步性；系统采用基于显示同播的事件同播方式，这样在一定程度上降低了数据冗余，同时扩大了系统的用户数量。
Firstly , in this dissertation , two types of symbol start time estimation schemes for orthogonal frequency division multiplexing ( ofdm ) systems are evaluated and analyzed . simulation results suggest that : pilot symbol based synchronization has better performance over cyclic prefix based schemes , and it performances improved when the length of pilot symbol increases ; cyclic prefix based synchronization method has a high spectrum efficiency in spite of its relative low acquisition of synchronization rate ; and the former is more suitable to bursting symbol based information systems , such as ieee802 . 11a , while the later can be used in broadcasting systems for continuous media streams , such as digital video broadcasting systems , digital audio broadcasting systems 首先,论文从同步获取的角度对ofdm系统中的两类时域符号同步方案进行了性能分析,并通过大量的仿真说明:基于训练序列的同步方法具有较好的同步获取成功率,其性能随训练序列的长度增加而改善;基于循环前缀的同步方法,其同步获取成功率较低,但是具有较高的频谱利用率;前者适用于突发数据帧传输系统,如ieee802 . 11a等,后者适合广播式连续媒体流传输系统,如数字音频、数字视频系统。
In this paper , we describe an self - adapted multimedia stream model based active signaling and probe . in the active network , routers deploy active signaling excution environment and probe , furthermore probe will scout active environment and adjust resource reservation level of routers while network resource is enough , then work in sender to transport . active network have a lot of branch , we exert active reservation protocol and rsvp to carry through active router ' s reservation , handle probe to detect starte , sender will send vary quality media data , receiver request differ quality media reservation , so wo can achieve media stream availability transmit and control . this model is bringed forward multimedia stream , but adapted for lots of transmit and control . 在一个主动网络中，路由器配置主动信令运行环境和探针程序，由探针对主动环境的状态进行监视，在网络资源充足时调整主动路由器的资源预留水平，并配合发送端进行合适的传输。主动网络已产生了众多的研究分枝，我们运用了主动信令协议（ asp ）和资源预留协议（ rsvp ）来进行主动路由器的资源预留，运用主动探针进行状态的探测，由发送端发送不同质量的媒体数据，由接收端请求满足不同质量媒体预留，从而实现流的有效传输和控制。
