摘 要
本文首先介绍数字电视技术中的关键技术和技术标准，通过比较世界上现有的三种数字电视系统标准并结合通信网络发展趋势，提出了数字电视技术发展趋势和在中国的应用。
in nowadays, dtv (digital television) is a conception wel-known to the world. but it is difficult to get systemic understanding about dtv from the point of technology view, for it includes too many complex technologies. so this article urge to giving a simple explanation for dtv technologies and system. it also introduces some key technologies and system structure about dtv. according to compare the difference between three standards of dtv system, which are set up by usa, eu, japan respectively, and analyze the trend of telecommunication technologies, the article make some predictions about dtv technologies and its adoption in china.

当前，世界各国正面临着从模拟电视向数字电视演进的变革。和通信领域以往所有模拟技术向数字技术演进历程一样，在用户需求和科学技术进步的巨大拉动下，数字电视技术日趋成熟，在不断为人们提供更高质量、更多功能、更个性化的音视频节目服务的同时，逐渐成为电视系统的主流。但是，数字电视技术是一门复杂的通信技术，涉及通信的各个领域。本文试图从系统的角度出发，简单分析数字电视系统的关键技术和系统发展趋势。


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