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Causal signals and causal system 
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#1
Jan2113, 07:49 AM

P: 99

Is there a difference between causal signal and causal system ?
I got this doubt because consider a system h(t) whose out put depends on present and past inputs only for all t ( infinity to + infinity ) so this system is a causal system now if we treat this as a signal and since it exists from infinity to+ infinity so it will be a noncausal signal. . . . which one is correct ? 


#2
Jan2113, 10:47 AM

P: 140

Causality in systems makes the most sense. Causality in signals doesn't make that much sense.
Causality in systems determines whether a system relies on future information of a signal x[n+1]. When talking about "causality" in signals, we mean whether they are zero to the left of t=0 or zero to the right of t=0. A causal signal is zero for t<0 A noncausal zero has values present for t<0. Anticausal signals are zero for t>0. However, the reason why this doesn't really make sense is that if you have a signal, the time t=0 can be chosen arbitrarily. 


#3
Jan2113, 11:51 AM

P: 99

Got it :) thank you for clarifying :)



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