Electrical Engineering ⇒ Topic : Causal and Noncausal Systems

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Causal and Noncausal Systems A system is said to be causal if its output depends on the present and past values of the input but it does not depend on the future values of input. Therefore, a causal system cannot produce an output before the application of input. A causal system is nonanticipatory. On the other hand, a system whose output depends on the future input is known as noncausal system. The output y(t) = x(t) + 2x (t  1) + x(t  2) and y(t) = x(t) + 1/2 ∫ x(t) dt represent a causal system. On the other hand, y(t) = x(t + 3), y(t) = x(t) + 2x(t + 1) and y(t) = dx(t)/dt represent a noncausal system.  
 
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