DIGITAL BROADCAST RETRANSMITTER, DIGITAL BROADCAST RECEIVER AND DIGITAL BROADCAST RETRANSMISSION SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a digital broadcast retransmitter ensuring robust reception of emergency alarm broadcast, and to provide a digital broadcast receiver and a digital broadcast retransmission system.;SOLUTION: A broadcasting state detecting section 214 detects broadcasting state information and acquires a start control flag for emergency alarm broadcast and an emergency information descriptor. An emergency broadcasting detecting section 222 delivers an emergency alarm broadcast start/end flag and the emergency information descriptor to a digital CATV broadcast controller 31. The digital CATV broadcast controller 31 delivers the emergency alarm broadcast start/end flag and the emergency information descriptor to a multiplexer 32. The multiplexer 32 multiplexes the emergency alarm broadcast start/end flag and the emergency information descriptor on the TS of a specific channel. An OFDM modulator 33 and a QAM modulator 34 modulate the TS and transmit a modulated digital broadcast wave to a digital CATV receiver 4 on the channel of a voluntary digital broadcasting.;COPYRIGHT: (C)2007,JPO&INPIT