求课，链接已贴
https://www.udemy.com/course/discrete-fourier-transform-and-spectral-analysis-matlab/
https://www.udemy.com/course/introduction-to-fourier-transform-and-spectral-analysis/#instructor-1
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已上传：
https://www.koudaizy.com/tutorials/introduction-to-fourier-transform-and-spectral-analysis/
https://www.koudaizy.com/tutorials/discrete-fourier-transform-and-spectral-analysis-matlab/