Causality

A system is said to be "causal" if at any given time, the output signal depends only on the present and/or past input signals.


A system is said to be "non-causal" if at any given time, the output signal depends on the future input signal.


As an example, the output signal $ y(t) = x(t+3) $ where $ x(t) $ is the input signal would be non-causal.

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