Typical signals and their representation . Unit Step u(t(in our textbook u(t)) ult) t>0 0t<0 u(t) u(t) is basic causal signal, multiply which with any non-causal signal to get causal signal.Typical signals and their representation ❖Unit Step u(t) (in our textbook (t))  1 0 0 0 ( )  =  t t u t u(t) 1 0 t u(t- t0 ) 1 0 t t 0 ❖u(t) is basic causal signal, multiply which with any non-causal signal to get causal signal