Sampling System Diagram

\begin{pspicture}(-3,-5)(8,3)

% in from x
\rput(-3.2,0){$x(t)$}
\psline[linewidth=1.25 pt, arrowscale=1.1]{->}(-2.7,0)(-0.25,0)
% out to y
\rput(2,0.3){$x_g(t)$}
\rput(8.6,0){$y_g(t)$}
\psline[linewidth=1.25 pt, arrowscale=1.1]{->}(0.25,0)(2.7,0)
\psline[linewidth=1.25 pt, arrowscale=1.1]{->}(6,0)(8,0)
% up arrow
\psline[linewidth=1.25 pt, arrowscale=1.1]{->}(0,-1.65)(0,-0.25)

% multiplier
\pscircle(0,0){0.25}
\psline(-0.175,0.175)(0.175,-0.175)
\psline(0.175,0.175)(-0.175,-0.175)

\rput(3.2, 0.5){$H(\omega)$}
\rput(5.3, 0.6){$(T_s)$}
\psline{->}(3.25, 0)(5.5,0)
\psline(3.75, 0.0)(3.75, 0.5)
\psline(4.75, 0.0)(4.75, 0.5)
\psline(3.75, 0.5)(4.75, 0.5)

\psline(3.75, 0.1)(3.75, -0.1)
\rput(3.7, -0.45){$-\frac{\omega_s}{2}$}
\psline(4.75, 0.1)(4.75, -0.1)
\rput(4.7, -0.45){$\frac{\omega_s}{2}$}

\psframe(2.65, -0.75)(6, 1)


% impulses
\rput(2.3,-1.7){$g(t) = \sum \limits_{k = -\infty}^{\infty}\delta(t-kT_S)$}
\rput(-1.1,-2.1){$(1)$}
\rput(-1.3,-2.5){$\cdots$}
\rput(1.3,-2.5){$\cdots$}
\psline{->}(-1.5,-3)(1.5,-3)
\psline[linewidth=1.25pt]{->}(-0.75,-3)(-0.75,-2)
\rput(-0.75,-3.3){$-T_s$}
\psline[linewidth=1.25pt]{->}(0,-3)(0,-2)
\rput(0,-3.3){$0$}
\psline[linewidth=1.25pt]{->}(0.75,-3)(0.75,-2)
\rput(0.75,-3.3){$T_s$}


% box
\psframe(-1.75,-3.65)(7, 1.2)

\end{pspicture}