Add tp1
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2 changed files with 73 additions and 1 deletions
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@ -1,6 +1,6 @@
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timestamp=$(shell date +%Y-%m-%d_%H:%M)
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all: td1
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all: td1 tp1
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td1: td1.tex
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@latexmk -pdf td1.tex
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@ -11,5 +11,14 @@ td1: td1.tex
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echo "Updated"; \
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fi
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tp1: tp1.tex
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@latexmk -pdf tp1.tex
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@if ! cmp --silent build/tp1.pdf tp1_*.pdf; then \
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touch tp1_tmp.pdf; \
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rm tp1*.pdf; \
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cp build/tp1.pdf tp1_${timestamp}.pdf; \
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echo "Updated"; \
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fi
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clean:
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@rm -rf build 2>/dev/null
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63
theorie-signal/exercices/tp1.tex
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63
theorie-signal/exercices/tp1.tex
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\documentclass[a4paper,french,12pt]{article}
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\title{
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Théorie du signal --- TP1
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\\ \large Décomposition en Série de Fourier
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}
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\author{}
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\date{Dernière compilation~: \today{} à \currenttime}
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\usepackage{../../cours}
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\usepackage{enumitem}
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\usepackage{xfrac}
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\usepackage{tikz}
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\begin{document}
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\maketitle
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\section{Partie théorique}
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\subsection{Coefficients de Fourier}
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Donner l'expression de la DSF réelle des signaux suivants $T_0$-périodiques~:
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\begin{align*}
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x_1(t) = 1 - \frac{2}{T_0} |t| \quad \forall t \in \left[-\frac{T_0}{2}; \frac{T_0}{2}\right]
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\end{align*}
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avec $T_0 = 0.5s$.
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$x_1$ est paire, donc les $b_n$ sont nuls.
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\begin{align*}
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a_0 &= \frac{1}{T_0} \int_{-\sfrac{T_0}{2}}^{\sfrac{T_0}{2}} 1 - \frac{2}{T_0}|t| \dif t \\
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&= \frac{2}{T_0} \int_0^{\sfrac{T_0}{2}} 1 \dif t - \frac{2}{T_0} \int_0^{\sfrac{T_0}{2}} \frac{2}{T_0}|t| \dif t \\
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&= \frac{2}{T_0} [t]_0^{\sfrac{T_0}{2}} - \frac{4}{T_0^2} \left[\frac{t^2}{2}\right]_0^{\sfrac{T_0}{2}} \\
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&= 1 - \frac{4T_0^2}{8T_0^2} \\ \\
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a_0 &= \frac{1}{2}
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\end{align*}
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\begin{align*}
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a_n &= \frac{2}{T_0} \int_{(T_0)} \left(1-\frac{2}{T_0}|t|\right)\cos(n\omega_0 t) \dif t \\
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&= \frac{4}{T_0} \int_0^{\frac{T_0}{2}} 1-\frac{2}{T_0}|t| \dif t \int_0^{\frac{T_0}{2}}\cos(n\omega_0 t) \dif t \\
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&= \frac{4}{T_0}\left(\frac{T_0}{2} - \frac{2}{T_0}\left[\frac{t^2}{2}\right]_0^{\sfrac{T_0}{2}}\right) \left[\frac{\sin(n\omega_0 t)}{n\omega_0}\right]_0^{\sfrac{T_0}{2}} \\
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&= \left(\frac{4T_0}{2T_0} - \frac{8T_0^2}{8T_0^2}\right) \frac{\sin(n\omega_0\frac{T_0}{2})}{n\omega_0} \\
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&= 1 \cdot \frac{\sin(\frac{2\pi n}{2})}{\frac{2\pi n}{T_0}} \\
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&= \frac{\sin(n\pi)}{\frac{2\pi n}{T_0}} \\
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a_n &= 0
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\end{align*}
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\begin{align*}
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S_x(t) &= a_0 + \sum_{n=0}^{+\infty} a_n\cos(n\omega_0 t) \\
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&= \frac{1}{2}
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\end{align*}
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\begin{align*}
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x_2(t) =
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\left\{
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\begin{array}{l}
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1 \quad \forall t \in \left[-\frac{T_0 r}{2}; \frac{T_0 r}{2}\right] \\
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0 \quad \text{sinon}
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\end{array}
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\right.
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\end{align*}
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avec $r$ le rapport cyclique tel que $r < 1$ et $T_0 = 0.5s$.
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\end{document}
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