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plz explain abt phase response of z plane

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moonnightingale

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my transfer function is
Transfer function:
z
-------
z - 0.5

i am attaching the pics. i understand pole zero map,
regarding magnitude response, i understand that when pole is close to unit circle,at omega=o, its value is maximum and as its disctance increasess, the magnitude decreases. but why magnitude peak is at 2. plz explain

Plz explain the phase response as well

thanks
 

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