Solution:

Assume an analog waveform $\mathrm{x}(\mathrm{t})$, as shown in Fig. (a), with a Fourier transform, X(f), which is zero outside the interval $\left(-f_m\ltf\ltf_m\right)$, as shown in Fig. (b). The sampling of $\mathrm{x}(\mathrm{t})$ can be viewed as the product of x(t) with a train of unit impulses functions, $x_s(t)$, shown in …