1.

H (z) is discrete rational transfer function. To ensure that both H(z) and its inverse are stable:

A. Poles must be inside the unit circle and zeros must be outside the unit circle
B. Poles and zeroes must be inside the unit circle
C. Poles and zeroes must be outside the unit circle
D. Poles must be outside the unit circle and zeros must be inside the unit circle
Answer» C. Poles and zeroes must be outside the unit circle


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