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Shared libraries for GSM speech compressor

Contains runtime shared libraries for libgsm, an implementation of the European GSM 06.10 provisional standard for full-rate speech transcoding, prI-ETS 300 036, which uses RPE/LTP (residual pulse excitation/long term prediction) coding at 13 kbit/s.

GSM 06.10 compresses frames of 160 13-bit samples (8 kHz sampling rate, i.e. a frame rate of 50 Hz) into 260 bits; for compatibility with typical UNIX applications, our implementation turns frames of 160 16-bit linear samples into 33-byte frames (1650 Bytes/s). 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).

The interfaces offered are a front end modelled after compress(1), and a library API. Compression and decompression run faster than realtime on most SPARCstations. The implementation has been verified against the ETSI standard test patterns.

Package version:1.0.12-1


GSM 06.10 13 kbit/s RPE/LTP speech compression available

The Communications and Operating Systems Research Group (KBS) at the
Technische Universitaet Berlin is currently working on a set of
UNIX-based tools for computer-mediated telecooperation that will be
made freely available.

As part of this effort we are publishing an implementation 


libgsm (1.0.12-1) unstable; urgency=low

  * New upstream release
   o change in the WAV#49 portion of gsm_implode.c

 -- Jochen Friedrich <>  Mon, 12 Nov 2007 19:11:43 +0100

libgsm (1.0.10-14) unstable; urgency=low

  * Change build system to debhelper and dpatch (Closes: #437371)
  * Bumped policy version to 3.7.2
  * Rename config.h to gsm_config.h (Closes: #428989)

 -- Jochen 


Fri Jun  2 06:27:56 2006	Jutta Degener (

	* Release 1.0 Patchlevel 12
	src/code.c: removed modifiable static storage that made the library
	 	non-reentrant.  (Thanks to Paul Gibbs for pointing out the bug.)

Sat Mar 18 11:48:28 2006	Jutta Degener (

	* Release 1.0 Patchlevel 11
	src/gsm_implode.c: fix WAV49 implode
	move source archive location

Fri Jul  5 19:26:3


This is the Debian GNU/Linux prepackaged version of libgsm, an implementation of the
European GSM 06

Browse inside libgsm1_1.0.12-1_i386.deb

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