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| -rw-r--r-- | tex/filters.tex | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/tex/filters.tex b/tex/filters.tex index 4271e35..e785e0a 100644 --- a/tex/filters.tex +++ b/tex/filters.tex @@ -1 +1,58 @@ \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: |