在matlab下利用simulink搭建模块，对典型信号如正弦波、方波、三角波、锯齿波、白噪声以及叠加波形的时域信号进行频谱（幅值谱）特性分析。-Module in matlab simulink structures, such as sine, square, triangle wave, sawtooth wave, white noise, as well as the time-domain signal waveforms superimposed spectrum (amplitude spectrum) characteristics of a typical signal.