题目内容
（请给出正确答案）
研究一个长度为M点的有限长序列x(n)
计算Z变换
在单位圆上N个等间隔点上的抽样，即在
，k=0，1，…，N-1上的抽样。试对下列情况，找出只用一个N点DFT就能计算X(z)的N个抽样的方法，并证明之。
(1)N≤M，(2)N＞M。
分析 当时域序列点数为M，频域抽样点数为N点时，
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