Question

6.A signal x(t) is said to be causal, if

1.x(t)=0 for t<0
2.x(t)=0 for t>0
3.x(t)=0 at t=0
4.None
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Answer 1

Answer:

1. is correct answer.

Explanation:

for all t《0 , x is ZERO.

Causality in a systems determines whether a system relies on future information of a signal x[n+1].