In this topic, you study the Causal, Anticausal & Non-Causal Signals theory, definition & solved examples.
Causal Signal
A continuous-time signal $x(t)$ is said to be causal signal if $x(t)=0$ for $t$ < 0. The causal signal example is shown in Figure 1.
Figure 1: Causal signal.
Anticausal Signal
A continuous-time signal $x(t)$ is said to be anticausal signal if $x(t)=0$ for $t$ > 0. The anticausal signal example is shown in Figure 2.
Figure 2: Anticausal signal.
Non-Causal Signal
A continuous-time signal $x(t)$ is said to be non-causal when it non zero for $t$ > 0. The non-causal signal example is shown in Figure 3.
Figure 3: Non-causal signal.