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Signals & SystemsDiscrete-Time LTI

For a causal discrete-time LTI system, h[n] must be zero for?

  • An<0
  • Bn>0
  • Cn=0
  • DAll positive even n
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Correct Answer: A. n<0
Explanation: Causality requires h[n]=0 for negative n.
Reference: Standard signals and systems: discrete-time lti
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