Causal, Anticausal & Non Causal Signals - definition | Solved Examples

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.

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.

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.