EC > GATE 2018 > Discrete-time signals and systems
A discrete-time all-pass system has two of its poles at 0.25∠0° and 2∠30°. Which one of the following statements about the system is TRUE?
A
It has two more poles at 0.5∠30° and 4∠0°.
B
It is stable only when the impulse response is two-sided.
C
It has constant phase response over all frequencies.
D
It has constant phase response over the entire z-plane.

Correct : b

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