The Designment And Implementation On Signal Analysis And Measurement System Of Digital Television Terristrial Broadcasting System

In recent years,it is converted from analog TV to digital TV in the field of broadcast and television.After the effort of several years,Chinese national standard on digital television terrestrial broadcasting system has reached a mature and eventually released.The national standard is a mixed standard of single carrier technology and multiple carrier technology.With the released of the standard,digital television terrestrial broadcasting is being gradually extended in many places.In order to speed up the extension and the application,also to evaluate the existing digital television terrestrial broadcasting system,we need a easy-to-use signal analysis and measurement system.Firstly,the thesis introduced the current development of digital television at home and abroad and compared them.Then the thesis detailedly described the channel characters of terrestrial digital television,the structure of digital television terrestrial broadcasting system in China and the transmission stream defined in MPEG-2 standard.In the GB system,the thesis focused on the coding ,modulation and the frame structure of the OFDM signal.Then the thesis analyzed the requirement of measurement system,and put forward the overall designment.In the hardware implementation,the thesis introduced the block diagram of the receiver,EZ-USB FX2 architecture and the development of firmware and driver about USB.In the software implementation,the thesis described the specific implementation in subjective evaluation and objective evaluation,including the analysis of channel parameters and demodulation information and the calculation of bit-error-rate.The subjective evaluation is mainly video based on DirectShow.At the end of the thesis,we summarized the work that had been completed.