| 摘要 |
A method for measurement of amplitude of a periodic signal which is noise-robust, free of the effects of leakage of the frequency component, and free of any unbalance between the + side amplitude and - side amplitude, comprising (i) converting a periodic signal to a digital signal, (ii) applying a discrete Fourier transform to this digital periodic signal, calculating the magnitudes and phases of a fundamental frequency component and harmonic frequency components of the periodic signal in the frequency domain, (iii) applying an inverse discrete Fourier transform to the calculated frequency components to reconstruct the waveform in the time domain, and (iv) measuring the amplitude of the periodic signal from the waveform data at the center part of the reconstructed waveform on the time axis.
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