Drag and drop GSM sound file compressor/decompressor (.au.gsm to .au). It's fast! Accelerated for PowerMacintosh. Running native on both 68K and PPC . Hold down option key to compress. Default is decompress.
This is a quick port of the UNIX program GSM-1.0 Patchlevel 6 which compress audio (Sun .au sound file) down to 13 kbit/s, smaller than all the other audio format like mpeg audio or mu-law etc. The quality of the algorithm is good enough for reliable speaker recognition; even music often survives transcoding in recognizable form (given the bandwidth limitations of 8 kHz sampling rate).
I ported this to decompress RTHK news radio files (from http://www.cuhk.hk/rthk/ and its mirrors). This program will decompress a fubar.au.gsm file into fubar.au in the same folder.
Copyright (c) 1995 Paul C.H. Ho and Pink Elephant Technologies. All rights
MacGSM is written in Metrowerks CodeWarrior Gold CW6
Portions Copyright (c) Metrowerks Inc.
Based on DropShell 2.0 by Leonard Rosenthol, Marshall Clow, and Stephan Somogyi.
Based on DropUNIX by Ryan Davis
Based on AEThreads by Steve Sisak
GSM codec Copyright 1992, 1993, 1994 by Jutta Degener and Carsten Bormann, Technische Universität Berlin.