Sampling
A discrete-time signal can be (and often is) obtained by sampling a
continous-time signal. This operation is defined as taking the values of xc[t]
at times t = nT, and assigning those values to xd[n]. The parameter T is called
the sampling interval.
Definition of sampling:
In[9]:=
xd[n_] := xc[t] /. t->nT
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