在技术发达的美国,广播电视台远距离的节目传送、转播均采用国内通信卫星。在今天的美国除了现有的一千座电视台和八千多座广播电视台以外,其他形式的电视机构,尤其是电缆电视公司,得到了飞速的发展。据专家估计八十年代末,美国85％的家庭将连通电缆电视(现在连通电缆电视的家庭约为20％)。为适应这种形势的需要,美国“联邦电信委员会”去年12 In the advanced technology of the United States, the long distance broadcasting and TV programs of radio and television stations broadcast and broadcast all adopt domestic communication satellites. In today’s United States, in addition to the existing 1,000 television stations and 8,000 radio and television stations, other forms of television organizations, especially cable television companies, have seen rapid development. According to expert estimates, 85% of households in the United States will be connected to cable television (now about 20% of cable-television households are connected) by the late 1980s. In order to meet the needs of this situation, the United States “Federal Telecommunications Commission” last year 12