| 摘要 |
PROBLEM TO BE SOLVED: To provide a signal processing circuit effective to an unnecessary fluctuating signal even in a state wherein the unnecessary fluctuating signal is present. SOLUTION: A digital circuit section 120 adaptively predicts a noise and outputs the noise to an analog circuit section 110 as a subtraction signal. The subtraction signal is given to a subtractor circuit 111 through a D/A converter 114. The subtractor circuit 111 eliminates the noise from an analog input signal. Then a variable amplifier circuit 112 amplifies an output from the subtractor circuit 111 and an A/D converter 113 converts the amplified signal into a digital signal. COPYRIGHT: (C)2006,JPO&NCIPI
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