A signal described by a continuous function of time has a unique value at every definable instant. For example, given the continuous cosine signal *c*(*t*) = cos(2*πf*_{0}*t*), its value at an arbitrary time such as *t* = 5.00012 s can be determined by computing *c*(5.00012) with the aid of a pocket calculator. This chapter deals with discrete time signals of the form {*c*(*nT*)} for constant *T* and integer *n*, which do not exist at every point in time, but which are generally representative of an underlying continuous signal *c*(*t*).

Consider the task of plotting by hand some continuous signal *s*(*t*). It is usually not necessary to compute *s*(*t*) for every point on a graph. Instead, the desired shape of *s*(*t*) can be reproduced by drawing a smooth line through ...

Start Free Trial

No credit card required