Primary And Secondary Digital Video System Design

Video is widely used in education in primary and junior school. There are many advantages of delivering video by the computer network, such as no interference, convenience of controls, reduced the maintenance work of network and getting stripe expediently.The television equipment of school can be build up completely at the DV technique on, with the cheap DV camera and so on. Then, the editing system can adopt non-card editing system, only IEEE1394 connect but have no editing card.The digital delivering system is established on the streaming media technology. It is formed from the streaming media multicast server, the VOD server, the wide bandwidth network and the client computers. Multicasting needs an encoder to send out the video and audio steaming to the multicast server. The encoder with capture card is able to take a living cast. VOD needs the VOD servers. Windows Media system is fit for primary and junior school. 2Mbps is the data rate fits school's teaching work.The Windows Media encoder is based on the PC hardware platform, armed of broadcasting software. The software can be developed using the Windows Media Format SDK.For a video streaming playing on the network smoothly, the network structure must support audio and video streaming deliver normally. Firstly, we must calculate out the number of streaming in school teaching and the bandwidth. Secondly, we can chose the suitable network structure based on the layout of school.Upgrade of the old network of school must base on the reality, find the choke point and amend it.