This Hg repository contains a mostly-raw import of GSM-HR speech codec
implementation from the original GSM 06.06 publication.  The only modification
that has been made is a minimally-invasive surgical change to gsm_hr.c (the
main module) that allows the default noisy output to be suppressed at run time,
rather than at compile time, and suppresses all of this noisy output rather
than just one part of it.  Also a Makefile has been added, for straightforward
compilation on "semi-modern" systems such as Slackware Linux.

This work has been produced for two purposes:

1) To make it possible to actually run this original GSM-HR code, before the
   laborious effort of librifying it and incorporating it into gsm-codec-lib,
   and for verification, testing and comparison after that planned work.

2) To have the code readily available in a public Hg repository, allowing
   direct links to individual files or even to line numbers.  Such easy linking
   ability is needed to facilitate analysis and discussion of various aspects
   of this reference code.