应用FFT对典型信号进行频谱分析，应用FFT实现序列的线性卷积和相关(FFT is used to analyze the spectrum of typical signals, and the linear convolution and correlation of sequences are realized by FFT)

计算多组信号的卷积，并画图，采用傅里叶变换分析信号的幅度谱和角度谱，采用matlab 编写(The convolution of multiple sets of signals was calculated and plotted. The amplitude and angle spectra of the signals were analyzed by Fourier transform. Matlab was used to write the graph.)