initial commit

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2026-06-15 11:10:31 +02:00
commit 4daf219dd6
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.direnv/flake-profile Symbolic link
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flake-profile-2-link

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/nix/store/99fjzvv2y3g37jbqi28q8080db1183xk-latex-env

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.envrc Normal file
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use flake

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Assignment4_211.aux Normal file
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\relax
\providecommand \babel@aux [2]{\global \let \babel@toc \@gobbletwo }
\@nameuse{bbl@beforestart}
\catcode `"\active
\babel@aux{english}{}
\babel@aux{austrian}{}
\gdef \@abspage@last{6}

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# Fdb version 4
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(generated)
"Assignment4_211.aux"
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(rewritten before read)

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PWD /home/quirinecker/projects/semester06-signal_processing/assignment04
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INPUT Assignment4_211.tex
OUTPUT Assignment4_211.log
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\textsf{\textit{#1}}\\*[1ex]%
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{\par\pagebreak[2]}
% Innerhalb der Aufgaben erfolgt die weitere Unterteilung mittels einer
% enumerate Umgebung, die allerdings a), b),... zaehlen soll.
\renewcommand{\labelenumi}{\alph{enumi})}
\renewcommand{\labelenumii}{\arabic{enumii})}
% A box to tick for everything which has to done
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% Margin paragraphs on the left side
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% Language for listings
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% basicstyle=\small\tt,
% keywordstyle=\tt\bf,
% commentstyle=\sl}
% No indention
\setlength{\parindent}{0.0cm}
% Don't number sections
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%% Beginning of the text
\begin{document}
\selectlanguage{austrian}
\pagestyle{plain}
%=== This is the header section ============================================================
\thispagestyle{empty}
\noindent
\begin{minipage}[b][4cm]{1.0\textwidth}
\begin{center}
\begin{bf}
\begin{large} Digitale Signalverarbeitung SS 2025/26 -- 4.~Aufgabe\end{large} \\
\vspace{0.3cm}
\begin{Large} Reconstruction, DFT, FFT \end{Large} \\
\vspace{0.3cm}
\end{bf}
\begin{large}
Gruppennummer 211 \\
Manuel Illmayer, k12308149 \\
Quirin Ecker, k12310122 \\
\end{large}
\end{center}
\end{minipage}
\noindent \rule[0.8em]{\textwidth}{0.12mm}\\[-0.5em]
%=======================================================================================
\begin{aufgabe}{Reconstruction}
\begin{enumerate}
\item : \\
\includegraphics[width=0.8\textwidth]{./fig/fig1.1.png} \\
\includegraphics[width=0.8\textwidth]{./fig/fig1.2.png}
\item : \\
\begin{gather*}
x(t) = 1 + 0.5 \cos(2\pi f_1 t) + 2 \sin(2\pi f_2 t) + \sin(2\pi f_3 t) \\
\end{gather*}
Calculation of $x_1[n]$:
\begin{gather*}
x(t) = 1 + 0.5 \cos(2\pi f_1 t) + 2 \sin(2\pi f_2 t) + \sin(2\pi f_3 t) \\
= 1 + 0.5 \cos(2\pi 2000 t) + 2 \sin(2\pi 4000 t) + \sin(2\pi 6000 t) \\
x_1[n] = 1 + 0.5 \cos(2\pi \frac{2000}{9000} n) + 2 \sin(2\pi \frac{4000}{9000} n) + \sin(2\pi \frac{6000}{9000} n) \\
= 1 + 0.5 \cos(\frac{4 \pi}{9} n) + 2 \sin( \frac{8 \pi}{9} n) + \sin( \frac{4 \pi}{3} n) \\
\\
\sin(\frac{4 \pi}{3}) = -\sin(\frac{2 \pi}{3})
\\
\implies x_1[n]= 1 + 0.5 \cos(\frac{4 \pi}{9} n) + 2 \sin( \frac{8 \pi}{9} n) - \sin( \frac{2 \pi}{3} n)
\end{gather*}
Calculation of $x_2[n]$:
\begin{gather*}
x_1[n] = 1 + 0.5 \cos(2\pi \frac{2000}{14000} n) + 2 \sin(2\pi \frac{4000}{14000} n) + \sin(2\pi \frac{6000}{14000} n) \\
= 1 + 0.5 \cos(\frac{2 \pi}{7} n) + 2 \sin( \frac{4 \pi}{7} n) + \sin( \frac{6 \pi}{7} n) \\
\end{gather*}
\includegraphics[width=0.8\textwidth]{./fig/fig1.3.png}
\item: \\
\[
f=\frac{\Omega f_s}{2\pi}
\]
Calculations for $x_1(t)$:
\[
f_1=\frac{\Omega_1 f_s}{2\pi}
=\frac{\left(\frac{4\pi}{9}\right)9000}{2\pi}
=2000
\]
\[
f_2 = ... = 4000
\]
\[
f_3=\frac{\Omega_3 f_s}{2\pi}
=\frac{\left(-\frac{2\pi}{3}\right)9000}{2\pi}
=-3000
\]
Calculations for $x_2(t)$:
\[
f_1 = ... = 2000
\]
\[
f_2 = ... = 4000
\]
\[
f_3 = ... = 6000
\]
Where '...' is just the formular at the top injected with the $\Omega$ values of b)
\includegraphics[width=0.8\textwidth]{./fig/fig1.4.png}
\end{enumerate}
\end{aufgabe}
\begin{aufgabe}{DFT Theory}
\begin{enumerate}
\item
\begin{gather*}
f_s = \frac{1}{T_s} = \frac{1}{0.001} = 1000 \text{Hz} \\
\Delta f = \frac{f_s}{N} = \frac{1000}{100} = 10 \text{Hz} \\
\end{gather*}
\item
\begin{gather*}
\text{In terms of samples}: 100 \\
\text{In terms of frequency}: N \cdot \Delta f_s = 1000 \text{Hz} \\
\text{In terms of angular frequency}: \omega = 2 \pi \frac{f}{f_s} = 2 \pi \frac{1000}{1000} = 2 \pi
\end{gather*}
\item Computers can calculate it more efficently when it is working with powers of two \\
\item $\Delta f = \frac{f_s}{N} = \frac{1000}{128} = 7.8125 \text{Hz}$ \\
\item Even though we have not gained new information, we have a finer resolution of the frequency axis. This can make it easier to get closer to the actual value.
\end{enumerate}
\end{aufgabe}
\begin{aufgabe}{FFT in Image Processing}
Approach: We want to remove the low frequencies (high pass filter) to
keep the areas of the image where the lightness changes relative to
nearby pixels \\
\includegraphics[width=0.8\textwidth]{./fig/fig3.1.png}
\end{aufgabe}
\begin{aufgabe}{Window Effects of the DFT}
\begin{enumerate}
\item ( see b) )
\item (see assignment4\_4.m) \\
\includegraphics[width=0.8\textwidth]{./fig/fig4.1.png}
\item
Rectangular window: Clear peaks but also many neighbors have fairly high values
Hamming window: Still visible peaks, that may be a bit wider, but now clearly separated from neighbors and more visually readable.
\item We can choose freqencies that align with our 128 steps, for example f1 = 10/N and f2 = 15/N. With this, the signal fits exactly within our window, each cosine has a integer number of cycles it completes \\
\includegraphics[width=0.8\textwidth]{./fig/fig4.2.png}
\end{enumerate}
\end{aufgabe}
\end{document}

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clear; close all; clc;
N = 128;
n = 0:N-1;
w1 = 2*pi*0.1;
w2 = 2*pi*0.15;
x = cos(w1*n) + cos(w2*n);
% a)
X = fft(x);
magX = abs(X);
figure;
stem(n, magX, 'filled');
xlabel('n');
ylabel('|X[n]|');
title('Magnitude Spectrum of x[n]');
grid on;
% b)
y = hamming(N)' .* x;
Y = fft(y);
magY = abs(Y);
figure;
stem(n, magY, 'filled');
xlabel('n');
ylabel('|Y[n]|');
title('Magnitude Spectrum of y[n]');
grid on;

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clc;
clear;
close all;
%% Parameters
f1 = 2000;
f2 = 4000;
f3 = 6000;
f3_rec = -3000
%% Time vectors
t=0:1e-6:1e-3;
%% Signals
x = 1+0.5*cos(2*pi*f1*t)+2*sin(2*pi*f2*t)+sin(2*pi*f3*t);
x1 = 1+0.5*cos(2*pi*f1*t)+2*sin(2*pi*f2*t)+sin(2*pi*f3_rec*t);
x2 = 1+0.5*cos(2*pi*f1*t)+2*sin(2*pi*f2*t)+sin(2*pi*f3*t);
%% Plot
figure
hold on
plot(t, x, 'b', 'LineWidth', 1.5)
plot(t, x1, 'r', 'LineWidth', 1.5)
plot(t, x2, '--g', 'LineWidth', 1.5)
grid on
xlabel('Time (ms)')
ylabel('x(t)')
legend('x(t)', 'x1(t)', 'x2(t)');

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clear; close all; clc;
img = imread('pavian.png'); % Choose any picture you like here
img = rgb2gray(img);
%% Display image
figure; subplot(131);
imshow(img);
title('Ausgangsbild');
%% FFT
fft2d = fft2(img);
% Display the FFT image.
subplot(132);
imshow(log(fftshift(abs(fft2d))), []);
title('2D-FFT');
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%
% Approach: We want to remove the low frequencies (high pass filter) to
% keep the areas of the image where the lightness changes relative to
% nearby pixels
% Shift FFT so low frequencies are in the center
F = fftshift(fft2d);
% Get image size
[M, N] = size(F);
% Radius of how much to remove
r = 25;
% We cut out the center of the fft low frequencies
H = ones(M, N);
H(M/2-r:M/2+r, N/2-r:N/2+r) = 0;
% Apply filter
F_filtered = F .* H;
% Shift back
fft2d = ifftshift(F_filtered);
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% IFFT to obtain filtered image
img_filtered = ifft2(fft2d);
subplot(133);
imshow(real(img_filtered), []);
title('Gefiltertes Ausgangssignal');

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{
description = "LaTeX paper build environment";
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outputs =
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let
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pkgs = import nixpkgs { inherit system; };
in
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devShells.${system}.default = pkgs.mkShell {
name = "latex";
buildInputs = with pkgs; [
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