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FFT相位误差分析及实用修正方法
引用本文:黄迪山.FFT相位误差分析及实用修正方法[J].振动工程学报,1994,7(2):185-189.
作者姓名:黄迪山
作者单位:上海中国纺织大学机械系
摘    要:本文在分析加窗信号的付氏变换基础上,探讨了由泄漏引起的相位误差,给出了FFT相位误差分布规律的解析表达式,并且对典型情况作了深入的讨论。文中还介绍了一种基于窗频谱幅度比的FFT相位修正技术,由实例计算知,在无噪声条件下,实际的相位估计与理论计算一致,因此它可应用于离散频率的振动和噪声信号相位的精确估计。

关 键 词:误差分析  付氏变换  泄漏  相位

Analysis on Phase Error in FFT and a Practical Approach Method
Huang Dishan.Analysis on Phase Error in FFT and a Practical Approach Method[J].Journal of Vibration Engineering,1994,7(2):185-189.
Authors:Huang Dishan
Abstract:n this paper, based on a windowing signal analysis with Fourier transform, the phase error caused by leakage has been investigated. The phase error distribution has been represented in mathematical expression, and some typical cases have been deeply discussed. Furthermore, according to a ratio of the window spectral value, an method has been introduced into phase estimation. Through an example, it is obviously known that the correction result is in good agreement with theoretical calculation without noise. So the approach method can be used to estimate accurately the phase of vibration and sound signal with discrete frequency.
Keywords:error analysis  Fourier transform  leakage  phase error  
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