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A continuous time LTI system is causal only when __________

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in Signals and Systems by (1.2m points)
A continuous time LTI system is causal only when __________

(a) It depends on the present value of the input

(b) It  depends on the past values of the input

(c) Its output always depends on future values of the input

(d) Its output might depend only on the past and present values of the system

The question was posed to me during an online interview.

Origin of the question is Properties of LTI Systems topic in section Time-Domain Analysis of CT Systems of Signals and Systems

1 Answer

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by (42.1k points)
Right choice is (d) Its output might depend only on the past and present values of the system

Best explanation: An LTI system is said to be causal when its output at any time depends on the previous and present value of the input. That is its value does not depend only on past values.

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