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README

      1 
      2 GSM 06.10 13 kbit/s RPE/LTP speech compression available
      3 --------------------------------------------------------
      4 
      5 The Communications and Operating Systems Research Group (KBS) at the
      6 Technische Universitaet Berlin is currently working on a set of
      7 UNIX-based tools for computer-mediated telecooperation that will be
      8 made freely available.
      9 
     10 As part of this effort we are publishing an implementation of the
     11 European GSM 06.10 provisional standard for full-rate speech
     12 transcoding, prI-ETS 300 036, which uses RPE/LTP (residual pulse
     13 excitation/long term prediction) coding at 13 kbit/s.
     14 
     15 GSM 06.10 compresses frames of 160 13-bit samples (8 kHz sampling
     16 rate, i.e. a frame rate of 50 Hz) into 260 bits; for compatibility
     17 with typical UNIX applications, our implementation turns frames of 160
     18 16-bit linear samples into 33-byte frames (1650 Bytes/s).
     19 The quality of the algorithm is good enough for reliable speaker
     20 recognition; even music often survives transcoding in recognizable 
     21 form (given the bandwidth limitations of 8 kHz sampling rate).
     22 
     23 The interfaces offered are a front end modelled after compress(1), and
     24 a library API.  Compression and decompression run faster than realtime
     25 on most SPARCstations.  The implementation has been verified against the
     26 ETSI standard test patterns.
     27 
     28 Jutta Degener (then jutta (a] cs.tu-berlin.de, nowadays jutta (a] pobox.com)
     29 Carsten Bormann (then cabo (a] cs.tu-berlin.de, nowadays cabo (a] tzi.org)
     30 
     31 Communications and Operating Systems Research Group, TU Berlin
     32 Fax: +49.30.31425156, Phone: +49.30.31424315
     33 
     34 --
     35 Copyright 1992 by Jutta Degener and Carsten Bormann, Technische
     36 Universitaet Berlin.  See the accompanying file "COPYRIGHT" for
     37 details.  THERE IS ABSOLUTELY NO WARRANTY FOR THIS SOFTWARE.
     38 

README.version

      1 URL: http://www.quut.com/gsm/gsm-1.0.17.tar.gz
      2 Version: 1.0.17
      3