A discrete real all pass system has a pole at z = 2 ∠

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A discrete real all pass system has a pole at z = 2 ∠ 30° : it, therefore

1. also has a pole at 1 ∠ 30°
  2
2. has a constant phase response over the zplane: arg | H(z)| = constant
3. is stable only, if it is anticausal
4. has a constant phase response over the unit circle: arg | H(e^jΩ)| = constant

Correct Option: D

NA