| 摘要 |
<p>PURPOSE: To eliminate disturbing component generated in a circuit using a shielded equipment whose disturbing component is exponential function type and has a small time constant by making signal measurement at least two times at two different instants, calculating the parameters of the disburbing component from the result of this measurement and subtracting the disturbing component from the signal. CONSTITUTION: An estimation device of the parameters of exponential component works by means of voltage detection at the time of restart of the device. At the time of restart, the output signal u (t) at the terminal of a low voltage capacitor Cb is in the form of u (t)=Acos (ωt+ψ)+Bexp (-t/τ). Acos (ωt+ψ) expresses an effective component of the signal and Bexp (-t/τ) stands for a disturbing component. If the signal u (t) is measured at two instants t1, t1 +π/ω, equation I is obtained. By adding these equations term by term, equation II is obtained, and the coefficient B is equal to equation III. When B is found, the characteristics of the disturbance are clarified. Namely, by means of clarified B, the signal Bexp (-t/τ) to be eliminated from the received signal u (t) is found, and as a result, the correction signal for the disturbing exponential component is obtained.</p> |
