82.1 Discrete-Time Signals: Time-Domain Representation In some applications, a discrete-time sequence xn may be generated by periodically sampling a continuous-time signalxa (t) at uniform intervals of time x4-57 a 3T -5T-37-70T x2(37)§2.1 Discrete-Time Signals: Time-Domain Representation In some applications, a discrete-time sequence {x[n]} may be generated by periodically sampling a continuous-time signal xa (t) at uniform intervals of time