Question

Causal systems are ______

(a) Anticipative

(b) Non anticipative

(c) For certain cases anticipative

(d) For certain cases anticipative and non anticipative

I had been asked this question by my school principal while I was bunking the class.

This interesting question is from Properties of the Impulse Response Representation for LTI Systems topic in section Time Domain Representation for LTI Systems of Signals and Systems

Answer 1

Correct answer is (b) Non anticipative

To explain I would say: Causal systems are non anticipative. They cannot generate an output before the input is applied. Which indicates the impulse response is zero for negative time.