SYSTEMS For the most part our view of systems will be from an input-output perspective A system responds to applied input signals, and its response is described in terms of one or more output signals CT SyStem DT SyStem7 SYSTEMS For the most part, our view of systems will be from an input-output perspective: A system responds to applied input signals, and its response is described in terms of one or more output signals x(t) CT System y(t) x[n] DT System y[n]