Causality

Figure 12: A causal system only reacts to it's input. Causal signals only evolve in positive time. Per definition the signal is zero for $t<0$.

Fig. 12 illustrates the concept of causality. Causal systems cannot look into the future. They can only react to a certain input. Causal signals are kept zero for $t<0$ per definition.

Figure 13: Illustration of the convolution. The shaded area shows the integration for $t=1$.

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