Terrestrial digital broadcast system, switching office device and switching office DC manner null for terrestrial digital broadcast

摘要

PROBLEM TO BE SOLVED: To detect an abnormality caused by interference fault or the like in a relay station apparatus, and to easily suppress output or switch output system.;SOLUTION: When broadcast waves sent from a master station apparatus A1 are relayed/transmitted by a relay station apparatus B, the master station apparatus A1 adds a broadcast station (master station) ID to a broadcast wave and send it out. A relay station apparatus B receives the broadcast wave, acquires the broadcast station ID to be added to the broadcast wave, collates it with the preset broadcast station ID, and control to stop relay transmission when the collated result is not coincident.;COPYRIGHT: (C)2008,JPO&INPIT