| This paper mainly studies the front-end HD/UHD video stream data acquisition,compression coding,multiplexing and adaptive rate adaptation technology based on terrestrial digital television broadcasting(Digital Video Broadcasting-Terrestrial2,DVB-T2)system.Transmission and video source signal capacity is high,the interface format type is flexible,and multi-channel stream multiplexing and other key technical problems,design and implementation of a set of high-definition television DVB-T2 transmitter system front end,flexible and High reliability multi-interface/multi-stream high-definition data acquisition and reuse system,and fully consider the system to achieve complexity and compatibility issues.The program involves two key technologies: HD/UHD YCr Cb video signal acquisition and multi-standard video format conversion processing,and DVB-T2 system based on the multi-channel H.264 TS stream multiplexing and data adaptive adaptation.Firstly,the paper introduces the research background and significance of front-end stream adaptation of terrestrial digital TV system,and summarizes the development course and evolution direction of digital video standard,video compression coding standard and DVB terrestrial digital TV broadcasting transmission standard.The paper puts forward some technical problems such as digital video format and interface,H.264 compression coding,TS stream structure and information,front-end data processing of DVB-T2 system,and analyzes the research and development of the research To take the solution of ideas and technical lines.Secondly,a functional requirement analysis of video signal acquisition and format conversion processing system is carried out.A multi-interface,high-definition video acquisition and format processing scheme is designed for the functional requirements,and a detailed process architecture,processing steps,As well as the realization of the key modules of the system description.In the design of the program,support HDMI,SDI two video interfaces,720 P,1080P and other high-definition video signals and a variety of SMPTE video format standards.On the concrete realization,based on XILINX ML605 development platform,set up HDMI / SDI video acquisition and processing system,using oscilloscope,logic analyzer and other equipment on the system performance testing,and gives a detailed test results analysis.Finally,based on the analysis of multi-channel stream multiplexing principle and the concrete realization requirement,a multi-channel TS stream information extraction and reuse scheme is designed,taking into account the complexity of the scheme implementation and the expansibility of the later function,Select the MFC(Microsoft Foundation Classes)development platform design software to achieve the program,the software features include local TS video file information extraction and 2 to 9 local TS video file reuse.In addition,based on the deep research of DVB-T2 modulator,a scheme of Q-stream rate adaptation and loading of DVB-T2 modulator is proposed,and the overall architecture of the scheme and the details of each key module are given Design Notes.In order to verify the feasibility of the scheme,the software simulation is carried out by Matlab and Quartus,and the simulation results are given. |
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