In the course of filtration, interpolation is the essential step to produce the intrinsic mode functions, and the basis of the Hilbert spectral analysis.
在筛选过程中，插值是产生本征模函数关键的一步，是希尔伯特谱分析的基础。
The algorithm of interpolation of hanning Windows FFT reduce the spectral leakage error and the interference between harmonics.
加窗插值fft算法减小了频谱泄漏误差和降低了谐波之间的相互干扰的影响。
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