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COPYRIGHT Distributing the README and COPYRIGHT files Jun 20, 2007
Makefile.am Distributing the README and COPYRIGHT files Jun 20, 2007
README Distributing the README and COPYRIGHT files Jun 20, 2007
add.c Fixed Linux bugs and added libgsm source code to project. Jun 19, 2007
code.c Fixed Linux bugs and added libgsm source code to project. Jun 19, 2007
decode.c Fixed Linux bugs and added libgsm source code to project. Jun 19, 2007
gsm.h Fixed Linux bugs and added libgsm source code to project. Jun 19, 2007
gsm_create.c Fixed Linux bugs and added libgsm source code to project. Jun 19, 2007
gsm_decode.c Fixed Linux bugs and added libgsm source code to project. Jun 19, 2007
gsm_destroy.c Fixed Linux bugs and added libgsm source code to project. Jun 19, 2007
gsm_encode.c Fixed Linux bugs and added libgsm source code to project. Jun 19, 2007
gsm_explode.c Fixed Linux bugs and added libgsm source code to project. Jun 19, 2007
gsm_implode.c Fixed Linux bugs and added libgsm source code to project. Jun 19, 2007
gsm_option.c Fixed Linux bugs and added libgsm source code to project. Jun 19, 2007
gsm_print.c Fixed Linux bugs and added libgsm source code to project. Jun 19, 2007
long_term.c Fixed Linux bugs and added libgsm source code to project. Jun 19, 2007
lpc.c Fixed Linux bugs and added libgsm source code to project. Jun 19, 2007
preprocess.c Fixed Linux bugs and added libgsm source code to project. Jun 19, 2007
private.h Fixed Linux bugs and added libgsm source code to project. Jun 19, 2007
proto.h Fixed Linux bugs and added libgsm source code to project. Jun 19, 2007
rpe.c Fixed Linux bugs and added libgsm source code to project. Jun 19, 2007
short_term.c Fixed Linux bugs and added libgsm source code to project. Jun 19, 2007
table.c Fixed Linux bugs and added libgsm source code to project. Jun 19, 2007
unproto.h Fixed Linux bugs and added libgsm source code to project. Jun 19, 2007

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 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.

Jutta Degener (jutta@cs.tu-berlin.de)
Carsten Bormann (cabo@cs.tu-berlin.de)

Communications and Operating Systems Research Group, TU Berlin
Fax: +49.30.31425156, Phone: +49.30.31424315

--
Copyright 1992 by Jutta Degener and Carsten Bormann, Technische
Universitaet Berlin.  See the accompanying file "COPYRIGHT" for
details.  THERE IS ABSOLUTELY NO WARRANTY FOR THIS SOFTWARE.