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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}