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+% Some basic examples for signal flow diagrams.
+%
+% Author: Dr. Karlheinz Ochs, Ruhr-University of Bochum, Germany
+% Version: 0.1
+% Date: 2007/01/05
+\documentclass{article}
+\usepackage{signalflowdiagram}
+
+\begin{document}
+
+%
+% Basic definitions of the symbols used in a signal flow diagram
+%
+
+% - input terminal
+\begin{signalflow}{Input terminal}
+ \node[input] (in) {$x(t)$};
+ \node[coordinate] (c) [right from=in] {};
+ % signal path
+ \path[r>] (in) -- (c);
+\end{signalflow}
+
+% - output terminal
+\begin{signalflow}{Output terminal}
+ \node[output] (out) {$y(t)$};
+ \node[coordinate] (c) [left from=out] {};
+ % signal path
+ \path[r>] (c) -- (out);
+\end{signalflow}
+
+% - branching node
+\begin{signalflow}{Branching node}
+ \node[input] (in) {$x(t)$};
+ \node[node] (nd) [right from=in] {};
+ \node[output] (out1) [above right from=nd] {$x(t)$};
+ \node[output] (out2) [below right from=nd] {$x(t)$};
+ % signal paths
+ \path[r>] (in) -- (nd);
+ \path[r>] (nd) |- (out1);
+ \path[r>] (nd) |- (out2);
+\end{signalflow}
+
+% - multiplier
+\begin{signalflow}{Multiplier}
+ \node[input] (in) {$x(t)$};
+ \node[multiplier] (mul) [right from=in] {\nodepart{above}{$\alpha$}};
+ \node[output] (out) [right from=mul] {$\alpha x(t)$};
+ % signal paths
+ \path[r>] (in) -- (mul);
+ \path[r>] (mul) -- (out);
+\end{signalflow}
+
+% - adder
+\begin{signalflow}{Adder}
+ \node[adder] (add) {};
+ \node[input] (in1) [above left from=add] {$x_1(t)$};
+ \node[input] (in2) [below left from=add] {$x_2(t)$};
+ \node[output] (out) [right from=add] {$x_1(t)+x_2(t)$};
+ % signal paths
+ \path[r>] (in1) -| (add);
+ \path[r>] (in2) -| (add);
+ \path[r>] (add) -- (out);
+\end{signalflow}
+
+% - modulator
+\begin{signalflow}{Modulator}
+ \node[modulator] (mul) {};
+ \node[input] (in1) [above left from=mul] {$x_1(t)$};
+ \node[input] (in2) [below left from=mul] {$x_2(t)$};
+ \node[output] (out) [right from=mul] {$x_1(t)x_2(t)$};
+ % signal paths
+ \path[r>] (in1) -| (mul);
+ \path[r>] (in2) -| (mul);
+ \path[r>] (mul) -- (out);
+\end{signalflow}
+
+% - delay element
+\begin{signalflow}{Delay element}
+ \node[input] (in) {$x(t)$};
+ \node[delay] (del) [right from=in] {$T$};
+ \node[output] (out) [right from=del] {$x(t-T)$};
+ % signal paths
+ \path[r>] (in) -- (del);
+ \path[r>] (del) -- (out);
+\end{signalflow}
+
+% - filter
+\begin{signalflow}{Filter}
+ \node[input] (in) {$x(t)$};
+ \node[filter] (fil) [right from=in] {$q(t)$};
+ \node[output] (out) [right from=fil] {$x(t)\ast q(t)$};
+ % signal paths
+ \path[r>] (in) -- (fil);
+ \path[r>] (fil) -- (out);
+\end{signalflow}
+
+% - building block
+\begin{signalflow}{Building block of a minimum shift keying modulator}
+ \node[input] (in) {$x(t)$};
+ \node[block] (msk) [right from=in] {Minimum shift keying modulator};
+ \node[output](out) [right from=msk] {$z(t)$};
+ % signal paths
+ \path[r>] (in) -- (msk);
+ \path[r>] (msk) -- (out);
+\end{signalflow}
+
+% - MSK symbol encoder
+\begin{signalflow}{Minimum shift keying symbol encoder}
+ \node[input] (in) {$x(t)$};
+ \node[modulator] (mod) [right from=in] {};
+ \node[multiplier] (mul) [below from=mod] {$\mathrm{j}$};
+ \node[delay] (del) [right from=mod] {$T$};
+ \node[node] (nd) [right from=del] {};
+ \node[output] (out) [right from=nd] {$y(t)$};
+ % signal paths
+ \path[c>] (in) -- (mod);
+ \path[c>] (mod) -- (del);
+ \path[c>] (del) -- (nd);
+ \path[c>] (nd) |- (mul);
+ \path[c>] (mul) -- (mod);
+ \path[c>] (nd) -- (out);
+\end{signalflow}
+
+
+\end{document}