1、利用Matlab求观察图示周期三角脉冲的傅里叶级数与原波形的关系。要求分别画出最高谐波次数n=1，3，5，7时合成波形与原波形的对照图。(The relationship between the Fourier series of the graphic periodic triangular pulse and the original waveform is observed by Matlab. The comparison of the synthetic and original