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1. |
Find the Z-transform of a periodic sequence x(n) = {1, 0, -3, 1}? |
A. | X(z) = 1 – 3z-2 + z-3; |z| ≠ 0 |
B. | X(z) = 1 – 3z-2 + z-3; |z| ≠ ∞ |
C. | X(z) = 1 – 3z-2 + z-3; |z| ≠ 0 and |z| ≠ ∞ |
D. | X(z) = (1 – 3z-2 + z-3)/(1 – z-4) |
Answer» E. | |