产生一512点的随机序列下Xe(n),并用Xc(n) 和Xe(n) 作线性卷积，观察卷积前后Xe(n) 频谱的变化。要求将Xe(n)分成8段，采用重叠保留法。-Generate one random sequence of 512 points under the Xe (n), and Xc (n) and Xe (n) for linear convolution, deconvolution observed before and after Xe (n) the spectrum cha