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gsm: Shared libraries for GSM speech compressor
- Summary
- 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.
Changelog
- * Sat Oct 7 00:00:00 2006 Thorsten Leemhuis <fedora [AT] leemhuis [DOT] info> 1.0.10-12
- rebuilt for unwind info generation, broken in gcc-4.1.1-21
- * Wed Sep 27 00:00:00 2006 Thomas Vander Stichele <thomas at apestaart dot org>
- 1.0.10-11
- rebuild for FC6
- * Thu Mar 9 23:00:00 2006 Andreas Bierfert <andreas.bierfert[AT]lowlatency.de>
- switch to new release field