| 摘要 |
PROBLEM TO BE SOLVED: To remove noise components included in a measurement signal outputted from a sensor without deteriorating rise characteristics of the signal. SOLUTION: The signal-processing apparatus has an A/D converter 12 for A/D converging and outputting a measurement signal (a) inputted from a sensor 11, a closed loop circuit 13, a judging part 22 for judging that an output signal of the closed loop circuit enters a stable region and outputting a judgment signal (e), and a high-speed Fourier transformer 23 which is started by the judgment signal (e) from the judging part, frequency converts the output signal of the closed loop signal and outputs a DC. component as a measurement value (d). In the closed loop circuit are incorporated a subtracter 14 for outputting a deviation signal (b) of a measured signal a1 from the A/D converter and an output signal (c), a loop amplifier 15 for amplifying the outputted deviation signal, and a loop filter 16 for frequency selecting the amplified deviation signal b1, outputting the signal as the output signal (c), and at the same time feeding back the output signal (c) to the subtracter 14.
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