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90年代,数字技术进入了广播电视领域,卫星广播电视得到了很大的发展。数字化的结果使卫星广播电视实现了多频道化、多工利用,并使高清晰度电视(HDTV)逐步进入实用阶段。而有线电视(CATV)和卫星广播相结合,将是未来广播电视的主要模式。卫星广播电视发展的第一阶段是完成环球电视的卫星转播,第二阶段是CATV的卫星接收,目前已进入的第三阶段是卫星直播电视(DBS)。一、近期的卫星广播电视概况 (一)日本的DBS 在当今世界各国中,日本的DBS最为普及,共有300多万户收视者。日本于1990年8月和1991年8月,先后成功地发射了BS-3a和BS-3b两颗卫星(见表1),它们构成了日本DBS的主体。
In the 90s, digital technology entered the field of radio and television and satellite radio and television has been greatly developed. The result of digitization has made satellite broadcasting and television multi-channelized and utilized, and made the HDTV step by step into the practical stage. The combination of CATV and satellite broadcasting will be the main mode for future radio and television. The first stage of the development of satellite radio and television is to complete the satellite broadcasting of Global TV. The second stage is the satellite reception of CATV. The third stage entered now is satellite live television (DBS). First, the recent overview of satellite radio and television (A) Japan’s DBS In all countries in the world today, Japan’s DBS is the most popular, a total of more than 300 million viewers. In August 1990 and August 1991, Japan successfully launched two satellites, BS-3a and BS-3b (see Table 1), which formed the main body of Japan’s DBS.