CORRECTIONS FOR FREQUENCY, AMPLITUDE AND PHASE IN A FAST FOURIER TRANSFORM OF A HARMONIC SIGNAL

Abstract This paper advances a new method which can correct the spectrum peak value of the rms spectrum in order to decrease the errors that exist when the spectral line is not on the peak. The authors first use the bary centre of spectral lines in the main lobe to obtain the coordinate of the spectrum peak. By this means the accurate frequency, amplitude and phase of the spectrum peak are obtained.