High Definition And Standard Definition Simulcast Of Research And Analysis

High definition digital television has never been perfect large screen display screen, high-definition and5.1-channel sound system, huge information capacity and transmission capacity available to the impact on the visual and auditory enjoyment. The emergence and the rapid development of high-definition television, greatly promoted the upgrading of the road of China’s TV technology. The digital SD systems compatible at this stage, HD SD simulcast a good solution to the convergence of these two technologies.The purpose of this study is the high standard definition with the broadcast environment, video and audio systems important concern technical problems to solve these problems could well meet this stage high standard definition with the broadcast technical requirements and program signals needs.From HD SD broadcast system architecture to start a high standard definition with the broadcast system to synchronize the different types and selection criteria, the causes of the different amounts of video and audio delay, the advantages and disadvantages of several options in the up and down conversion and HD SD system gamut of different sources and HD SD signal measurement. The research method is through a combination of high standard definition with the broadcast system architecture analysis and use of professional multi-format waveform tester method, to draw specific data and feasible method.