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-\section{Introduction}
-Asterisk utilizes a variety of sound prompts that are available in several file
-formats and languages. Multiple languages and formats can be installed on the 
-same system, and Asterisk will utilize prompts from languages installed, and 
-will automatically pick the least CPU intensive format that is available on the
-system (based on codecs in use, in additional to the codec and format modules
-installed and available).
-
-In addition to the prompts available with Asterisk, you can create your own sets
-of prompts and utilize them as well. This document will tell you how the prompts
-available for Asterisk are created so that the prompts you create can be as close
-and consistent in the quality and volume levels as those shipped with Asterisk.
-
-\section{Getting The Sounds Tools}
-The sounds tools are available in the publicly accessible repotools repository.
-You can check these tools out with Subversion via the following command:
-
-\begin{astlisting}
-\begin{verbatim}
-# svn co http://svn.asterisk.org/svn/repotools
-\end{verbatim}
-\end{astlisting}
-
-The sound tools are available in the subdirectory sound_tools/ which contains the
-following directories:
-
-\begin{itemize}
-\item audiofilter
-\item makeg722
-\item scripts
-\end{itemize}
-
-\section{About The Sounds Tools}
-The following sections will describe the sound tools in more detail and explain what
-they are used for in the sounds package creation process.
-
-\subsection{audiofilter}
-The audiofilter application is used to "tune" the sound files in such a way that
-they sound good when being used while in a compressed format. The values in the
-scripts for creating the sound files supplied in repotools is essentially a
-high-pass filter that drops out audio below 100Hz (or so).
-
-(There is an ITU specification that states for 8KHz audio that is being compressed
-frequencies below a certain threshold should be removed because they make the
-resulting compressed audio sound worse than it should.)
-
-The audiofilter application is used by the 'converter' script located in the
-scripts subdirectory of repotools/sound_tools. The values being passed to the
-audiofilter application is as follows:
-
-\begin{astlisting}
-\begin{verbatim}
-audiofilter -n 0.86916 -1.73829 0.86916 -d 1.00000 -1.74152 0.77536
-\end{verbatim}
-\end{astlisting}
-
-
-The two options -n and -d are 'numerator' and 'denominator'. Per the author,
-Jean-Marc Valin, "These values are filter coefficients (-n means numerator, -d is 
-denominator) expressed in the z-transform domain. There represent an elliptic filter
-that I designed with Octave such that 'the result sounds good'."
-
-\subsection{makeg722}
-The makeg722 application is used by the 'converters' script to generate the G.722
-sound files that are shipped with Asterisk. It starts with the RAW sound files and
-then converts them to G.722.
-
-\subsection{scripts}
-The scripts folder is where all the magic happens. These are the scripts that the
-Asterisk open source team use to build the packaged audio files for the various
-formats that are distributed with Asterisk.
-
-\begin{itemize}
-\item chkcore - used to check that the contents of core-sounds-$<$lang$>$.txt are in sync
-\item chkextra - same as above, but checks the extra sound files
-\item mkcore - script used to generate the core sounds packages
-\item mkextra - script used to generate the extra sounds packages
-\item mkmoh - script used to generate the music on hold packages
-\item converters - script used to convert the master files to various formats
-\end{itemize}