数字电视的基本原理与数字电视系统 毕业论文.doc

数字电视的基本原理与数字电视系统 摘 要 世界通信与信息技术的迅猛发展将引发整个电视广播产业链的变革，数字电视是这一变革中的关键环节ABSTRACT The world communication and information technology has developed rapidly will cause the television broadcast industry chain change, and the digital television is the change in the process, more and more countries in developing and hope that through the digital television promotion of national communications broadcasting technology. this paper is divided into four parts ：the first part mainly introduces the basic principles of digital television and the digital television systems required equipment ； the second part of the major figures in the government to the rule of necessity, the government of the status and improvement measures ；the third part of the digital television several operation mode and the problems existing in the introduction ； the fourth part of our digital television to make a study. Key words：digital television；government regulation；Current Situation；Outlook 目 录 摘要………………………………………………..…….….…………….. .I ABSTRACT…………….……………………..……………. .I 1 数字电视….…………………………………………………………….….……………..1 1.1 数字电视原理..........................………….………….………..1 1.2数字电视系统及设备...…………….………….………..2 1.2.1数字摄像机......................………………………….…....……….2 1.2.2 广播传输系统......................…………......................…………..................3 1.2.3 用户接收端......................…………......................………………………..3 2数字电视发展的政府规制.………………………….………………….....….………….5 2.1有线电视的自然垄断属性要求政府规制.................5 2. 2 新型的媒介业务要求政府规制…………………….………………..………..5 2. 3 有线电视的国家产权要求政府规 ….……………….........…………….. …...5 2. 4 我国有线数字电视政府规制现状…………………….…………………….…..6 3 我国数字电视发展现状….……………………………………………………….…..…7 3. 1 我国数字电视运行的几种模式…………………….………………..………..7 3.1.1 青岛模式…………….……………….………………………………….…7 3.1.2 佛山模式…………….……………….………………………………….…7 3.1.3 杭州模式…………….……………….………………………………….…8 3. 2 有待克服的问题…………………….…………………………...……..………..8 4数字电视发展前景展望……………..…………………………..………………….…..10 4.1我国数字电视技术展望…………………………………..………………..........10 结论......................………….………….……………………..…