Research On The Principle And Application Of Digital High Definition OB Van

Digital high definition TV is the direction of broadcasting development. It will be a part of our life. And the OB Van will be equipped by Television-Stations in the near future. With the mobile and flexible feature, high definition rediffusion system would be very important equipment applied by people.The thesis studies and discusses the high definition rediffusion system quantity considering China's actual situation. And it achieve the goal of recording and playing high definition,standard definition & analog signals simultaneously. This thesis works out design purpose and principle and key points by combining the up-to-date technology and the actual requirement of television station. The design achieves the goal of recording signal, and broadcasts standard definition and analog signals simultaneously by muli-broadcasting via multilevel mixer. Apply the powerful function of mixer to achieve the design of emergency broadcasting system, the advantage is to minimize the investment of emergency system, while improve the security of broadcasting system. Considering the future higher requirement when designing the system, I can be easily upgraded to multi-track stereo by using 5.1 track encoder. It can be switched by transmitting flexible prepare signals by router.We can improve the work efficiency and make our life more happiness by using the high definition rediffusion system on the OB Van.