The Influence of the Dominant Frequency Position on FFT Spectrum¡¡Leakage

Liu Ginming, Ying Huaiqiao
(China Orient Institute of Noise & Vibration, Beijing, 100088£©

Abstract: When FFT spectrum leakage was discussed before, the deminant frequency position was not considered. In fact, the FFT spectrum is the convolution between read time series and window function in domain of frequency, the dominant frequency position influence on leakage should not be ignored. The leakage regularity of different dominant frequency position was deduced in this paper for fundamental waves FFT spectrum, and a correction method was also put forward.
Keywords: FFT, leakage correction.