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Signals & SystemsFrequency Response

For h[n]=(0.5)^n u[n], H(e^(jω)) is obtained by replacing z^-1 with?

  • Ae^(-jω)
  • Be^(jω)
  • Cjω
  • D1/jω
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Correct Answer: A. e^(-jω)
Explanation: On the unit circle z=e^(jω), hence z^-1=e^(-jω).
Reference: Standard signals and systems: frequency response
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