In the December 1994 issue of Dr. Dobb's Journal, an article by Jutta Degener explained the overall architecture of GSM, gave sources for a toy implementation of an algorithm similar to the one GSM uses. At the same time, a special issue called "Dr. Dobb's Sourcebook for the Information Highway" came out that contained source code for a tool named IGP, Internet Global Phone. The tool used the GSM library (among other things) to communicate voice through a 14,400 baud modem line. The files in this directory are files pertaining to these two articles. I am not connected to IGP in any way, except that a clarinet release lists me and this directory as a possible source for the "software implementation" - omitting the detail that the software, in this case, means GSM, not IGP. ---Jutta Degener, Nov 23th, 1994 Update: The GSM release distributed with IGP turned out to be one year out of date; it will not port easily to MSDOS. If you plan to use GSM independently from IGP, please use the gsm-105.zip in this directory rather than the gsm.zip distributed with IGP. If you already have gsm.zip, use the patches in gsm-105.pat to bring your level 2 release to patchlevel 5. ---Jutta Degener, Nov 28th, 1994 Update: With the help of Peter Rigstad, yet another 16-bit integer math bug in GSM could be fixed, bringing the DOS-friendly version of GSM to patchlevel 6. If you hear chirps in your GSM output, get the patch. ---Jutta Degener, Dec 30th, 1995 Some cosmetic changes, and another 16-bit integer math bug fixed thanks to Richard Elofson of Ericsson Mobile Communications, Sweden. ---Jutta Degener, Tue Mar 7th, 1995 The patchlevel 9 release has more WAV #49 support in the library (thanks to Jeff Chilton), a fixed bug, and some small, cosmetic changes. ---Jutta Degener, Tue Jul 2nd, 1996