Description : What is a causal system? Give an example.
Last Answer : A system is said to be causal if the output of the system at any time ‘n’ depends only on present and past but does not depend on future inputs. In mathematical terms, the output of a causal system satisfies an equation of the form, y(n)=F[x(n),x(n-1),x(n-2)…….] Example : y(n)=x(n)-x(n-1)