In STFT is window is of finite length, and we no longer have perfect frequency resolution.
快速傅立叶变换用到的窗宽度长度有限，因此不能获得完美的频率分辨率。
STFT method has the window problem, which limits the vertical resolution, and cannot adapt the thickness transverse change of layers.
短时傅里叶变换技术存在窗口问题，限制了垂向分辨率，而且不能适应地层厚度的变化；
You may ask, why don't we make the length of the window in the STFT infinite, just like as it is in the FT, to get perfect frequency resolution?
你可能会问，我们为什么不像傅立叶变换用无限长的窗口一样，而在快速傅立叶变换中却用有限长的窗口进行分析呢？
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