| With the improvement of living standard, people require more excellent experience in terms of enjoyment. Signal transmission is the core of the entire transmission system of radio, film and television. This article studies in depth the stability of the transmission of radio, film and television from the points of equipment and technology, and presents plans and designs for current Qinhuangdao cable network transmission system. It has very important academic value to improve the transmission stability and to build Qinhuangdao cable television network transmission systems.First, principles of broadcasting and television transmission system are introduced, and current popular radio and television transmission system(DVB) system in the world are introduced in detail. Framework and features of DVB system are analyzed. Several standard interfaces in DVB system are introduced, and their work style and performance are analyzed in detail.Second, some coding schemes applied in the broadcasting and television transmission system are compared. The analog-to-digital and digital-to-analog conversion modules are analyzed. Then, the characteristics and shortcomings of digital transmission system are studied. Several digital coding technologies are discussed in detail to present their advantages and disadvantages. The band modulation technologies of digital television signal transmission system are analyzed. A coding scheme is selected to used in the radio and television transmission system.Third, the signal transmission system with optical fiber is analyzed, and the light delivery module receiving module of optical fiber transmission system are discussed. The optical fiber transmission part is tested according to the technical indicators of the optical fiber transmission. According to the experimental results, the advantages of using optical fiber are presented, compared with the use of coaxial cable.At last, Qinhuangdao television transmission network is planed and designed. |
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