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，采用重叠相加法。-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 changes. Requested that Xe (n) is divided into 8 paragraphs, using overlap add method.