【摘要】 通过固定观察点而让主频率移动的方法，研究了单一频率成分的波形在加矩 形 窗函数时 FFT(Fast Fourier Transformation)谱泄漏的机理和主频率在 FFT谱上的不同 位 置对泄漏产生影响的一般规律，导出了计算幅值、频率和相位精确值的公式。算例结果表 明，该计算公式正确。更多还原

【Abstract】 ： By fixing view point, the study is conducted to analyse the me ch anism of FFT(Fast Fourier Transformation) spectrum leakage when rectangular wa v e of single frequency composition is added, and the general rule of influence o f main frequency upon leakage when its position is different in FFT spectrum. Fo rmulae used to calculate these exact results of amplitude, frequency and phase a re derived. Calculation results show that these formulae are correct.更多还原