DVB (Digital Video Broadcasting) refers to digital video broadcasting. Its main purpose is to find a digital TV technology and standard applicable to all transmission media. Its core is MPEG-2 audio and video coding.
   There are three criteria:
DVB-S data broadcasting satellite method;
DVB-C data broadcasting is a closed circuit;
DVB-T data broadcasting ground microwave relay method.
   What are the components of the satellite communication system: the satellite communication system consists of a space segment and a ground segment.
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