中文说明：
讲解了傅里叶变换与频谱分析之间的关系，通过fft得到信号的频谱图。
English Description：
The relationship between Fourier transform and spectrum analysis is explained, and the spectrum diagram of the signal is obtained by FFT
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中文说明：
讲解了傅里叶变换与频谱分析之间的关系，通过fft得到信号的频谱图。
English Description：
The relationship between Fourier transform and spectrum analysis is explained, and the spectrum diagram of the signal is obtained by FFT