Fourier变换是一种纯频域的分析方法，它在频谱的定位性是完全准确的（即频谱分辨率高），而在时域无任何定位性（或分辨能力）-Fourier transform is a pure frequency domain analysis, it is the positioning of the spectrum is completely accurate (ie, high spectral resolution), and in the time domain without any sexu