| 摘要 |
PURPOSE: A detected radio frequency relay tuning circuit is provided to immediately confirm whether a wiretapped signal for a detected suspicion electric wave or a specific signal exists. CONSTITUTION: A high frequency amplifying circuit 1(12) and a frequency branch circuit(13) of a radio wave sensor calculate the frequency of a detected electric wave. A control circuit(19) is connected to a tuning circuit(15) and synchronizes a calculated frequency with the frequency of the high frequency amplification circuit 2(14). A wave detecting circuit(16) detects a low frequency signal, amplifies a voice and a sound, and transmits a signal to speaker(21) or an earphone. A low frequency amplification circuit(18) amplifies a voice or an acoustic signal and transmits a signal to a speaker or an earphone. |
