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author | Benny Prijono <bennylp@teluu.com> | 2007-04-07 12:29:46 +0000 |
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committer | Benny Prijono <bennylp@teluu.com> | 2007-04-07 12:29:46 +0000 |
commit | 3ade1510e72926d02d7c7d4416257449bc0cd3f3 (patch) | |
tree | c51d4960cac0fcd8bf3483a8e77444ac5f9a3177 /third_party/gsm/README | |
parent | bfd3f58f5b715238fe618d053ddf908a34f1e56c (diff) |
Split speex, portaudio, and gsm into third_party directory
git-svn-id: http://svn.pjsip.org/repos/pjproject/branches/split-3rd-party@1168 74dad513-b988-da41-8d7b-12977e46ad98
Diffstat (limited to 'third_party/gsm/README')
-rw-r--r-- | third_party/gsm/README | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/third_party/gsm/README b/third_party/gsm/README new file mode 100644 index 00000000..cb6af85c --- /dev/null +++ b/third_party/gsm/README @@ -0,0 +1,37 @@ + +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. |