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 sexual orientation (or the resolving power)