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\section{Filters}
\begin{figure}
\centering
\begin{tikzpicture}[
axis tick/.style = {
inner sep = 1mm,
outer sep = 1mm,
},
x axis tick/.style = {
axis tick,
path picture = {
\draw[thick, -]
($(path picture bounding box) + (0,.1)$) --
($(path picture bounding box) - (0,.1)$);
}
},
y axis tick/.style = {
axis tick,
path picture = {
\draw[thick, -]
($(path picture bounding box) + (.1,0)$) --
($(path picture bounding box) - (.1,0)$);
}
}
]
\pgfmathsetmacro\xlen{5}
\pgfmathsetmacro\ylen{3}
\coordinate (O) at (0,0);
\draw[thick, ->] (O) to
% node[pos = .5, x axis tick, label = -90:1] {}
node[pos = .4, x axis tick, label = -90:\(\Omega_D\)] (OmegaD) {}
node[pos = .65, x axis tick, label = -90:\(\Omega_S\)] (OmegaS) {}
++(\xlen,0) node[right] {\(\Omega\)};
\draw[thick, ->] (O) to
node[pos = .2, y axis tick, label = 180:\(A_\text{max}\)] (Amax) {}
node[pos = .7, y axis tick, label = 180:\(A_\text{min}\)] (Amin) {}
++(0,\ylen) node[above] {\(A\)};
\draw[dashed, lightgray]
(Amin) -- ++(\xlen,0)
(Amax) -- ++(\xlen,0)
(OmegaD) -- ++(0,\ylen)
(OmegaS) -- ++(0,\ylen);
\draw[very thick, red!80!black] (Amax) -| ($(OmegaD) +(0,3)$);
\draw[very thick, red!80!black] (OmegaS) -- (Amin -| OmegaS) -- ++(1.5,0);
\node[align = center] at (1,1.3) {Stamp \\ (passband)};
\node[align = center] at (4.3,1.3) {Mold \\ (stopband)};
\end{tikzpicture}
\end{figure}
% vim:ts=2 sw=2 et:
|
