diff --git a/spectral/lecture/spectral-chapter.tex b/spectral/lecture/spectral-chapter.tex
new file mode 100644
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+\documentclass[12pt]{book}
+
+\input{../../header}
+
+\lstset{inputpath=../code}
+\graphicspath{{images/}}
+
+\typein[\pagenumber]{Number of first page}
+\typein[\chapternumber]{Chapter number}
+\setcounter{page}{\pagenumber}
+\setcounter{chapter}{\chapternumber}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\begin{document} 
+
+\input{spectral}
+
+\section{TODO}
+\begin{itemize}
+\item hm, let's see, maybe we could start writing it...
+  
+\item
+\end{itemize}
+
+\end{document}
+
diff --git a/spectral/lecture/spectral.tex b/spectral/lecture/spectral.tex
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+++ b/spectral/lecture/spectral.tex
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+\chapter{Spectral analyses}
+
+This is a stub that should be filled :)
+
+\section{The Fourier space}
+
+\section{The Fourier Transform}
+
+\subsection{Fast Fourier transform}
+
+\section{Power spectrum}
+
+\section{Spectrogram}
+
+\section{Transfer function}
+
+\section{Forward and reverse filter}
+
+\section{Coherence function}