对于实序列??[??]=??????(????/??)，???≤??≤????；计算出??(??????)。并对x[n]作奇偶分量分解，分别计算出奇、偶分量的频谱????(??????)与谱 ????(??????)。
（1）频率计算范围：-pi~pi，频率步长设置：pi/800；
（2）分别画出：x[n]的频谱实部、x[n]的频谱虚部、偶分量的频谱实部、偶分量的频谱虚部、奇分量的频谱实部、奇分量的频谱虚部；排列方式如图所示；
（3）6个图的横坐标对pi作归一化处理，显示范围设置为：-1~1
　　 6个图的纵坐标显示范围：min~max(Draw the real part of the spectrum of x[n], the imaginary part of spectrum of x[n], the real part of the spectrum of the even part, the imaginary part of the spectrum of the even part, the real part of the spectrum of the odd part, and the imaginary part of the spectrum of the odd part; The arrangement is as shown in the figure;
(3) The abscissa of the six graphs is normalized to pi and the display range is set to: -1~1
The y-coordinate display range of 6 maps: min~max)