广播电视数字化被视为我国信息化建设中的“大计”。从2003年开始,广电总局先后在全国49个城市和地区开展有线数字电视试点工作,推动整体转换,付出了很大的努力,取得了显著的成绩。然而,整个进程却比人们想像的困难得多,主要原因在于:1.我国的有线电视数字化工作起步较晚,当前只是处于发展的初期阶段。而美国数字电视 The digitalization of radio and television is regarded as the “big picture” in the construction of informatization in our country. Since 2003, the SARFT has piloted digital cable television in 49 cities and regions throughout the country, promoted the overall conversion, paid a great effort and achieved remarkable results. However, the whole process is far more difficult than people think. The main reasons are as follows: 1. The digitalization of cable television in our country started relatively lately and is only in the initial stage of development. The United States digital television