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# Ch8-ä½œä¸šè§£ç­”-2010

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Ch8 习题参考解答 8-1 求下列序列的 z 变换 () Xz ，并标明收敛域，绘出 的零极点图。 解：

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1 ~ 9 ）各题对应的零极点图如解图 8-1 a ~ i ）所示。 1 解图 8-1

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8-3 求下列序列的 z 变换，并标明收敛域，绘出零极点图。 1 0 ( ) cos( ) ( ) (0 1) n x n Ar n u n r    2 ( ) ( ) ( ) ( ) N x n R n u n u n N 解： 1 由于 因此 由于 因此 其零极点图如解图 8-3 a ）所示。 2 根据 z 变换定义有

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3 幂级数展开法：
8-10 求下列 () Xz 的逆变换 xn 解： 3 由于收敛域为 |z|>1 ，因此 为右边序列。由 11 ( ) [ ] ( ) 2 sin 2 sin sin( 1) sin ( ) sin jj jn jn ee x n e e u n nn un 

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Ch8-ä½œä¸šè§£ç­”-2010

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