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fft
- 对信号进行FFT,绘制出频率变化振幅,以及Nyquist频率之前随频率变化的振幅,进行谱分析,对归一化频率0~1进行分析。(The signal is FFT, the amplitude of frequency change is drawn, and the amplitude of the frequency changes with the frequency before the Nyquist frequency. The spectral analysis is carried