| 摘要 |
PROBLEM TO BE SOLVED: To acquire information over entire operation frequency bands of an electric circuit, without causing interferences with all the signals to be generated by providing a carrier circuit which is set, so that a double side-band pilot signal arranged outside the operation frequency band or in proximity to a boundary of the operation frequency band is generated. SOLUTION: This system is provided with a carrier circuit 156, connected to a double side-band(DSB) modulator 154 and a detection circuit 180. Information acquired in the detection circuit 180 is collected from a double side-band pilot signal connected to an electric circuit 108 by using the carrier circuit 156 and the DSB modulator 154. The carrier circuit 156 and the DSB modulator 154 generate a pilot signal and the detection circuit 180 acquires information from the pilot signal. In this case, the pilot signal is positioned outside an operation frequency band of the electrical circuit 108 in spectrum and will not interfere with all the impressed or generated signals positioned within the frequency band of the electric circuit 108.
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