| 摘要 |
PROBLEM TO BE SOLVED: To provide a broadcast communication system in which a digital master station can simultaneously send a report to digital slave stations and analog slave stations, by providing a digital-analog signal conversion relay station to the system. SOLUTION: The broadcast communication system includes the digital slave stations 105 and 106 which are called with a calling digital radio signal sent from the digital master station 101 and receive a broadcast reporting digital radio signal, and the digital-analog signal conversion relay station 104 which receives the calling digital radio signal and reporting digital radio signal transmitted from the digital master station 101, converts the digital signals to calling analog radio signal and reporting analog radio signal and transmits them. Further, the broadcast communication system includes the analog slave stations 107 and 108 which are called with a calling analog radio signal transmitted from the digital-analog signal conversion relay station 104 and receives a reporting analog radio signal. COPYRIGHT: (C)2008,JPO&INPIT |
