2.1 Discrete-Time Signals: Time-Domain Representation Signals represented as sequences of numbers,called samples In some applications,a discrete-time sequence [n} may be generated by periodically sampling a continuous-time signal x(t)at uniform intervals of time xa(-5T 37 -5T -3T-T 0 T xa(3T)§2.1 Discrete-Time Signals: Time-Domain Representation Signals represented as sequences of numbers, called samples 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