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windsylph

  • 3 years ago

Signals and Systems: Causality: Can someone please explain how y(t) = ((t-1)^3)x(t/2) is a causal system? I see no way how y(t) uses future values of x(t)...

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  1. goformit100
    • 3 years ago
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    @marcoduuuh

  2. LolWolf
    • 3 years ago
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    Remember that t/2 <= t, so it is a causal system, because it relies on *past*, not future, values of x(t).

  3. windsylph
    • 3 years ago
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    oh gosh I messed up my definition of "causal"... thanks!

  4. LolWolf
    • 3 years ago
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    Sure thing!

  5. windsylph
    • 3 years ago
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    Wait, nvm, I wanted to ask why this is NOT causal. I was marked off in my exam for saying it is causal because it doesn't use future values of x(t). Or maybe this is just a grading mistake..

  6. LolWolf
    • 3 years ago
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    I'm pretty sure your statement is right, though, but I may be wrong...? Dunno, I'd go check with your prof, just in case.

  7. windsylph
    • 3 years ago
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    Yeah, thanks :D

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