System Block Diagram
A signals-and-systems block diagram with framed subsystems, arrows, and an inline Fourier series equation, drawn entirely with PSTricks.
Rendering LaTeX…
Source
\begin{pspicture}(0,-3)(8,3)
\rput(0,0){$x(t)$}
\rput(4,1.5){$f(t)$}
\rput(4,-1.5){$g(t)$}
\rput(8.2,0){$y(t)$}
\rput(1.5,-2){$h(t)$}
\psframe(1,-2.5)(7,2.5)
\psframe(3,1)(5,2)
\psframe(3,-1)(5,-2)
\rput(4,0){$X_k = \frac{1}{p} \sum \limits_{n=\langle p\rangle}x(n)e^{-ik\omega_0n}$}
\psline{->}(0.5,0)(1.5,0)
\psline{->}(1.5,1.5)(3,1.5)
\psline{->}(1.5,-1.5)(3,-1.5)
\psline{->}(6.5,1.5)(6.5,0.25)
\psline{->}(6.5,-1.5)(6.5,-0.25)
\psline{->}(6.75,0)(7.75,0)
\psline(1.5,-1.5)(1.5,1.5)
\psline(5,1.5)(6.5,1.5)
\psline(5,-1.5)(6.5,-1.5)
\psline(6,-1.5)(6.5,-1.5)
\pscircle(6.5,0){0.25}
\psline(6.25,0)(6.75,0)
\psline(6.5,0.5)(6.5,-0.5)
\end{pspicture}