diff options
author | Chia-chi Yeh <chiachi@android.com> | 2010-09-23 03:27:35 +0800 |
---|---|---|
committer | Chia-chi Yeh <chiachi@android.com> | 2010-09-23 11:18:34 +0800 |
commit | 5e4516958690b9a1b2c98f88eeecba3edd2dbda4 (patch) | |
tree | c497acc6869740d4969efc1e34e13e3abe8df0b8 /README | |
parent | 243a761508ef45a0939593178b25a71533c87400 (diff) | |
download | libgsm-5e4516958690b9a1b2c98f88eeecba3edd2dbda4.tar.gz |
libgsm: first import.android-sdk-tools_r12android-sdk-adt_r20android-sdk-adt_r16.0.1android-sdk-adt_r12android-sdk-4.0.3_r1android-sdk-4.0.3-tools_r1android-sdk-2.3.4_r1android-cts-verifier-4.0_r1android-cts-verifier-4.0.3_r1android-cts-4.1_r4android-cts-4.1_r2android-cts-4.1_r1android-cts-4.0_r1android-cts-4.0.3_r2android-cts-4.0.3_r1android-cts-2.3_r5android-cts-2.3_r4android-cts-2.3_r3android-cts-2.3_r2android-cts-2.3_r12android-cts-2.3_r11android-cts-2.3_r10android-cts-2.3_r1android-4.1.2_r2.1android-4.1.2_r2android-4.1.2_r1android-4.1.1_r6.1android-4.1.1_r6android-4.1.1_r5android-4.1.1_r4android-4.1.1_r3android-4.1.1_r2android-4.1.1_r1.1android-4.1.1_r1android-4.0.4_r2.1android-4.0.4_r2android-4.0.4_r1.2android-4.0.4_r1.1android-4.0.4_r1android-4.0.3_r1.1android-4.0.3_r1android-4.0.2_r1android-4.0.1_r1.2android-4.0.1_r1.1android-4.0.1_r1android-2.3_r1android-2.3.7_r1android-2.3.6_r1android-2.3.6_r0.9android-2.3.5_r1android-2.3.4_r1android-2.3.4_r0.9android-2.3.3_r1aandroid-2.3.3_r1.1android-2.3.3_r1android-2.3.2_r1android-2.3.1_r1tools_r21tools_r20jb-releasejb-mr0-releasejb-devics-plus-aospics-mr1-releaseics-mr1ics-mr0-releaseics-mr0ics-factoryrom-2-releasegingerbread-releasegingerbread-mr4-releasegingerbread
Change-Id: Id4c884ba020207dc74543058c0f1bea3fa34d28d
Diffstat (limited to 'README')
-rw-r--r-- | README | 37 |
1 files changed, 37 insertions, 0 deletions
@@ -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. |