| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a demodulated signal of a frequency hopping wave without limiting a communication system by detecting a signal from N-number of receiving means capable of receiving N-number of frequency hopping waves and leading out a detected signal. SOLUTION: RF signals respectively inputted to frequency converters 3-1 to 3-N by using the signal of a frequency set to each of local call originators 4-1 to 4-N are converted to the IF signal of IF frequencies and respectively inputted to signal detectors 5-1 to 5-N. The detectors 5-1 to 5-N compare a threshold value set in advance and the IF signal with each other to judge the existence of an input signal, send the judging result to a control part 6 and send the IF signal to a receiver switching device 7. The control part 6a specifies receiving group where a signal is inputted from among 1 to N by using the judging result sent from the detectors 5-1 to 5-N, controls the device 7 through the use of the result and output the signal to a demodulator 8.</p> |
