应用快速傅里叶变换对信号进行频谱分析，其中包括高斯序列、正弦序列、衰减正弦序列、三角波序列、反三角序列。绘出其时域，频域波形。有详细的标注！-Application of fast Fourier transform spectral analysis of signals, including the Gaussian sequence, sine series, sine decay sequence, triangular wave sequence, the anti-triangular sequence. Plotted the time domain and frequency domain waveforms. Detailed mark!