Q.

For a causal L.T.I. system, the impulse response is 0 for                    

A. t<0
B. t=0
C. t>0
D. always
Answer» A. t<0
Explanation: since the system is causal, the impulse response won’t exist for t<0. this is because the output of the system should not depend on future inputs. thus only option t<0 is correct.
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