Construct the Streaming Audio/Video Teaching Service;

And then,based on the consideration of practical and economic issues,many concrete schemes are described,including the modification scheme,system scheme and video and audio schemes.

This paper expounds the method of experimental teaching by College local net ,displaying the system model, introducing serial modes of video and audio signal transmission and the way of making teaching material which is applied to the system.

The source decoder is based on LSI Logic’s SC2005 single chip solution, which accomplishes demux, video and audio decoder, image processing, DAC and so on.

In this paper, we give the definition of the standard and the structure of our MPEG-4 compliant speech animation system and then, describe in detail the key techniques in implementation, including facial animation, the definition of Chinese viseme, viseme transmission, expression transmission, viseme .

The details of the system s design and the necessary technology are described,which includes viseme,production and display of the three- dimensional head model,voice and animation synchronization,smooth natural transition of the animation,the eye s tracking and random blink,and the system s interface design.