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gsm

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 162 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.

Homepage:
Package version:1.0.13
Architecture:x86_64
Distribution:CentOS
Filename:gsm-1.0.13-4.el6.x86_64.rpm

/usr/share/doc/gsm-1.0.13/README

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 
more»

/usr/share/doc/gsm-1.0.13/ChangeLog

Sun Apr  5  04:53:07 2009       Jutta Degener (jutta@pobox.com)

	* Release 1.0 Patchlevel 13
	COPYRIGHT: exploring the deeper meaning and cultural
	history of the word "any".

Fri Jun  2 06:27:56 2006	Jutta Degener (jutta@pobox.com)

	* 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.)
more»

/usr/share/doc/gsm-1.0.13/COPYRIGHT

Copyright 1992, 1993, 1994 by Jutta Degener and Carsten Bormann,
Technische Universitaet Berlin

Any use of this software is permitted provided that this notice is not
removed and that neither the authors nor the Technische Universitaet Berlin
are deemed to have made any representations as to the suitability of this
software for any purpose nor are held responsible for any defects of
this software
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