commit 2f0147e3ec3d779c1327ef641826b634a0b42219
Author: Robin P. Clark <r.clark@energytechnologycontrol.com>
Date:   Sun Oct 9 12:56:59 2022 +0100

    skeleton

diff --git a/practical_dsp.tex b/practical_dsp.tex
new file mode 100644
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+++ b/practical_dsp.tex
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+\documentclass[a4paper,10pt]{book}
+\usepackage[utf8x]{inputenc}
+\usepackage{graphicx}
+\usepackage{fancyhdr}
+\usepackage{lastpage}
+\usepackage{color}
+\definecolor{Blue}{rgb}{0.0,0.0,0.7}
+\definecolor{Red}{rgb}{0.7,0.0,0.0}
+\definecolor{Green}{rgb}{0.0,0.5,0.0}
+\definecolor{lightgrey}{rgb}{0.9,0.9,0.9}
+\definecolor{lightblue}{rgb}{0.7,0.9,1.0}
+\definecolor{lightyellow}{rgb}{1.0,1.0,0.9}
+\definecolor{lightcyan}{rgb}{0.8,1.0,1.0}
+\usepackage{hyperref}
+\usepackage{ifthen}
+\usepackage{algorithm}
+\usepackage{algorithmic}
+\usepackage{colortbl}
+\newcommand{\rev}{PA1} 
+\newcommand{\docno}{ 0000001 }
+\title{Practical DSP  \\ \etcdoc revision \rev}
+\author{R.P. Clark}
+
+\begin{document}
+ \pagenumbering{roman}
+\pagestyle{fancy}
+\maketitle
+%\lhead{}
+%\chead{\textbf{Practical DSP}}
+%\rhead{}
+%\rfoot{\thepage}
+%\cfoot{}
+%\lfoot{\textbf{\small Practical DSP: \docno Revision: \rev}}
+
+
+\clearpage
+
+\tableofcontents
+%\clearpage
+\listoffigures
+%\clearpage
+\listoftables
+%\clearpage
+\pagenumbering{arabic}
+\rfoot{ \textbf{ Page $\;$ \thepage $\;$  of $\;$ \pageref{LastPage}} }
+\chapter{Intro}
+\section{Z transforms to difference equations}
+\section{Tustins approximation for s transform derived filters}
+
+\chapter{Filter calculations}
+\section{Response Plotting}
+C programs linked with gnuplot to 
+provide response graphs, reasons how works
+\section{3 db point}
+
+\chapter{practical considerations}
+
+\section{Word length and precision}
+\section{Truncation problems}
+\section{B16}
+
+\chapter{Biquad and larger IIR filters}
+need tro break them down
+
+\chapter{Custom Z transform derived filters}
+
+
+\chapter{Deliberately unstable filters and harmonics}
+music?
+\end{document}