| 摘要 |
<P>PROBLEM TO BE SOLVED: To construct a broadcasting network by SFN by optimizing the broadcast radio waves of the output of a plurality of broadcasting apparatuses in a service area, and to effectively utilize a vacant channel thus obtained. <P>SOLUTION: A digital broadcasting signal is distributed to a plurality of broadcasting apparatuses 120-125 by a wire or a radio network NET. The digital broadcasting signal is sent toward a prescribed service area with mutually identical channel frequencies by radio waves, thus constructing the broadcasting network of SFN. In this case, when one or a plurality of channel frequencies differing from the channel frequency of radio waves sent from the plurality of broadcasting apparatuses 120-125 in common are assigned for additional service, any one of the plurality of broadcasting apparatuses 120-125 uses an assigned channel frequency for sending an arbitrary digital broadcasting signal toward a prescribed service area with radio waves, thus achieving additional service, and utilizing a vacant channel effectively. <P>COPYRIGHT: (C)2008,JPO&INPIT |
