Research And Design Of IP Video Telephone Based On New HFC Networks

The great function and a wide market of information makes a great impact on the development of the communication products. For many years, the need of better video information has been an important motive force for the developments of social sciences. In the period of"putting three networks into one", the video communication will be a very important driver for the market.The tendency of the communication development worldwide is to be more personalized, broadband,intelligent, digitalized and IP, of which broadband is the greatest important aim for the development of communication. As the audio communication work is full of the market, each telecom businessman in china is no longer putting large quantity of money in developing the classical audio communication work, and personal video communication is sure to be a shinning point of the future communication.As the technical system is so complicated, this article firstly makes a brief survey of the present technical standards and agreements of the IP video telephone. After a concrete analysis of all kinds of information technology, the audio-video coding technology and their characters, it gives a completely comparison for them. And we take the H.323 agreement and the H.264 video coding standard as the technical standard of the IP video telephone, because at present the H.323 agreement is the most mature agreement which is supporting audio, picture and digital work in packet based networking and it is also helpful for putting the video telephone into the market.In order to overcome the shortcomings of small scale, single function, high price, poor compatibility, and limited usages of the IP video telephones, this article emphasizes on the demands of the IP telephones. Compared with HFC network and the Integrated Services Terminal, the article makes a concrete analysis on the different plans of IP video telephones. We decide to choose the S3C2410 plan which is based on ARM9 to design the IP video telephone. We considered that this plan is wholly discussed, the chosen design is reasonable, the cost is low, and it meets the needs of the market.The article also makes an analysis on the system plan of the IP video telephone, and then emphasizes on the collecting and dealing the audio-video information. It begins with the choosing of components, the interfaces, and the peripheral circuits, and then designs the whole hardware plan of the IP video telephone. It uses the way of"toy bricks", and takes the digital USB camera and LCD display as the collecting and displaying components of the IP video telephone, which is not only helpful for designing, but also decreases the price of the products.The last parts of the article introduce the software model demands and the design of the IP video telephone. Firstly, it makes an analysis on demands, and then designs the software system of the whole video telephone, finally, it makes a specific analysis on how to put them into reality.And as the video treatment is the key part of the IP video telephone design, the article also focuses on the software design of the collection and broadcasting of the video pictures.