Study On A Digital Optical Terminal With HD,SD Video Self-adaptive Transmission Based By FPGA

With the society and the technology progress, people have raise their safety awareness. So, the high definition(HD) video monitoring product which is to protect our safety is becoming important. However the traditional analog standard definition(SD) video monitoring system caused by lack of image quality, is has started to be phased out. Also, it still occupies a large market share, and the video signal transmission carrier are based on the coaxial cable medium. Therefore, in the innovation of the SD and HD video monitoring technology, the coaxial cable transmission medium has carried the both analog standard-definition and high-definition video signal. However, in the current video transmission equipment research, most of the corporation main to design the high definition of video transmission requirements. Therefore, when the cable is carried the both SD and HD video signal, the HD transceiver equipment just can chose another equipment. This will complicate the equipment, and increase the cost.So, this topic is based on the study of the optical transceiver requirements which is need to transport the high-definition signal. The target is designing a kind of low cost, can transmit the SD and HD video signal adaptive transceiver. Thus avoid the programmer setting and equipment matching method. As a result, simplifying the structure of optical transceiver, making the equipment esayer, and has a wider application range. This thesis will conduct the research by the following points:1. Research on SD/HD video adaptive transmission method. Through analysis the optical transceiver principle, chose a high precision and high sampling rate of ADC, realize the SD/HD signal adaptive transmission;2. System analysis and hardware design of high definition digital optical transceiver. Through the optical system’s demand analysis, to design the overall scheme of the system. On the basis of the overall scheme design, complete the terminal and input module, FPGA, optical module and the 485 communication module hardware design, in the end complete power supply scheme;3. Research on data transmission strategy based on FPGA module. In order to realize the data real-time, synchronous transmission requirements as the key point, based on the FPGA module, through homologous clock design and special data frame structure design strategy, complete the real-time and synchronous data transmission.4. Function test and inspection system. Use the multimeter, oscilloscope and other experimental instrument, to testing the Optical Transmitter and Receiver System, and analysis the effect of the video transmission image, the results meet the requirements of technical indicators of the design.Final, the system uses digital optical transceiver based on FPGA module, to realize the low cost of the SD, HD video signal acquisition and transmission and processing, to meet the requirements for real-time, high-definition signal security monitoring system, has the widespread application prospect.