| 摘要 |
PURPOSE: An underground digital integrated radio network repeater is provided to relay a digital signal according to a division amplification method in a channel by converting a public wave broadcast signal into a digital signal. CONSTITUTION: An apparatus management unit(150) monitors operation states according to signals detected from an AM(Amplitude Modulation) digital multiple channel repeater, an FM(Frequency Modulation) digital multiple channel repeater, a DMB(Digital Multimedia Broadcasting) repeater, and an external wireless communication repeater. An output combination unit(170) combines signals inputted from the external wireless communication repeater, the DMB repeater, and FM digital multiple channel repeater in order to transmit the signal using one transmission cable. An AM transmission unit transmits the signal inputted from the AM digital multiple channel repeater. An FM transmission unit transmits a signal inputted from the output combination unit. [Reference numerals] (102) Antenna reception unit; (110) Emergency broadcasting unit; (130) Automatic switchover unit; (150) Apparatus management unit; (170) Output combination unit; (180) AM digital multiple channel repeater; (182) FM digital multiple channel repeater; (184) Ground wave DMB digital multiple channel repeater; (186) External wireless communication repeater; (188) Police radio; (190) Firefighting radio; (192) TRS; (200) First distributer; (202) First impedance adapter; (204) Second distributor; (206) Third distributor; (208) Fourth distributor; (210) Second impedance adapter; (212) Third impedance adapter; (214) First AM induction line; (216) First leakage coaxial cable; (218) Second leakage coaxial cable; (220) Second AM induction line; (222) Third leakage coaxial cable; (224) Third AM induction line; (226) End resistance; (228) End resistance; (230) End resistance; (232) End resistance; (234) End resistance; (236) End resistance
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