The Design And Realization Of The Embedded Video Intercom System

With the rapid development of the information age, and the continuous improvement of people's standard of living, the residential areas are also increasingly tended to intelligent, video intercom is an important function of a highly efficient and multi-function intelligent village. Video intercom system adapt to intelligent village and communication demand, which provide residents a safe and comfortable living environment. Generally, the video signals are transmitted by video simulation technology in the existing video intercom system, but this kind of traditional way have many drawbacks, such as interaction effect is not good, intelligent is not high enough and long distance transmission may bring about signal attenuation .In order to solve the above problems, in this thesis, combining embedded operating system Windows CE have many advantages such as small size and can be embedded to equipment. The digital embedded video intercom visual communication system will be done by the digital video technology, embedded technology and network technology. The System is based on idea6410 development board, which includes Samsung 6410 processor and based on ARM11 microprocessor and a low power consumption, high performance and higher capability with lower cost. The main results are as follows:1. The audio and video coding/decoding technology Speex and H.264, Real-time Transport Protocol and Real-time Transport Control Protocol, and Session Initiation Protocol are investigated in detail.2. To achieve the client-side video capture, encoding before sending, decoding after receiving, audio and video multi-protocol combination sending, audio and video multicast receiving, audio and video synchronization, etc.3. To achieve the server-side forwarding network data, audio and video data reception, decoding, compression and multicast sending.4. As the RTP itself does not provide any reliable mechanism, so we need a reliable based on User Datagram Protocol transmission congestion control method. Network congestion control is solved by the QoS (Quality of Service) technology in this thesis.5. To achieve RTP sub package and recombination, and resolve network communication through a NAT and so on.6. In order to analyze system performance, test environment is established. It realized the development of video intercom system and finished the function testing of the system. It achieved the satisfying effect.