Research And Design Of Video Transmission System Over WLAN Based On AT76C120

The wireless video communication system includes a wireless transmit device and a wireless receive device, and the transmission medium is free air space. The system implements the whole transmission over wireless LAN. The wireless video transmission system can be widely used in many wireless LAN system , such as wireless monitoring and control, industrial robot vision system, elevators security monitoring, unannounced visits to television news, and so on.AT76C120 processor is a multimedia processor, which is produced by ATMEL company. AT76C120 supports the video decoding and video signal coding of media files, which is a powerful video processor. And the video image processing of AT76C120 can be used in many video systems, such as wireless video transmission system, multimedia mobile phones, digital photo frame, and so on. The application of AT76C120 is very extensive. This paper is written about research and design of video transmission system over wireless LAN based on AT76C120.This paper summarizes the the basic principle of video transmission over IEEE 802.11 wireless LAN, and builds video transmission hardware and software system based on AT76C120, and discusses how to implement the whole communication over wireless LAN, and also especially discusses several kinds of methods for optimizing the system communication efficiency and security. In this paper, the first remarkable feature is the wireless video communication system is based on the use of the ARM7 processor AT76C120. This is a new attempt. The second remarkable feature is the system has been optimized by several kinds of methods, and gives the optimization data before and after contrast, and also finished smart start system over infrared. The third remarkable feature is the paper puts forward an innovative video data stream encryption algorithms to ensure that the actual system of double security.The system includes two AT76C120 processors. One is Server, and another is Client. They are wireless communication terminal equipments, and prepared to communicate. The main function of AT76C120 Server is collection video images, compression images data, processing data in the TCP / IP protocol stack by subparagraph, and transmission data over wireless LAN. The main function of AT76C120 Client is receiving data, processing data in the TCP / IP protocol stack, getting original compressed images data, decoding data, and showing images. After achieving a complete communication system, through further analysis system, the paper uses many methods to optimize and enhance the effectiveness and security of real-time communication system.