gsm_13200bps
所属分类：压缩解压
开发工具：C/C++
文件大小：150KB
下载次数：12
上传日期：2007-09-30 23:46:23
上 传 者：
foxymate
说明： this the source code of audio compression standard -- gsm.
(this the source code of audio compression standard-- gsm.
)
文件列表:
gsm_13200bps\add-test (0, 2007-09-30)
gsm_13200bps\add-test\add_test.c (5288, 2004-11-02)
gsm_13200bps\add-test\add_test.dta (7152, 2004-11-02)
gsm_13200bps\ChangeLog (279, 2004-11-02)
gsm_13200bps\COPYRIGHT (678, 2004-11-02)
gsm_13200bps\inc (0, 2007-09-30)
gsm_13200bps\inc\config.h (1226, 2004-11-02)
gsm_13200bps\inc\gsm.h (1681, 2004-11-02)
gsm_13200bps\inc\private.h (7154, 2004-11-02)
gsm_13200bps\inc\proto.h (1671, 2004-11-02)
gsm_13200bps\inc\toast.h (1926, 2004-11-02)
gsm_13200bps\inc\unproto.h (494, 2004-11-02)
gsm_13200bps\INSTALL (2509, 2004-11-02)
gsm_13200bps\MACHINES (351, 2004-11-02)
gsm_13200bps\Makefile (10528, 2004-11-02)
gsm_13200bps\Makefile_bak (10515, 2004-11-02)
gsm_13200bps\Makefile_bak1 (10518, 2004-11-02)
gsm_13200bps\MANIFEST (1193, 2004-11-02)
gsm_13200bps\src (0, 2007-09-30)
gsm_13200bps\src\a.c (10823, 2004-11-02)
gsm_13200bps\src\add.c (5733, 2004-11-02)
gsm_13200bps\src\add.o (8120, 2004-11-02)
gsm_13200bps\src\code.c (2669, 2004-11-02)
gsm_13200bps\src\code.o (4096, 2004-11-02)
gsm_13200bps\src\debug.c (1617, 2004-11-02)
gsm_13200bps\src\debug.o (456, 2004-11-02)
gsm_13200bps\src\decode.c (1632, 2004-11-02)
gsm_13200bps\src\decode.o (4160, 2004-11-02)
gsm_13200bps\src\gsm_create.c (867, 2004-11-02)
gsm_13200bps\src\gsm_create.o (3480, 2004-11-02)
gsm_13200bps\src\gsm_decode.c (3684, 2004-11-02)
gsm_13200bps\src\gsm_decode.o (6056, 2004-11-02)
gsm_13200bps\src\gsm_destroy.c (427, 2004-11-02)
gsm_13200bps\src\gsm_destroy.o (1560, 2004-11-02)
gsm_13200bps\src\gsm_encode.c (5053, 2004-11-02)
gsm_13200bps\src\gsm_encode.o (4888, 2004-11-02)
gsm_13200bps\src\gsm_explode.c (4443, 2004-11-02)
gsm_13200bps\src\gsm_explode.o (6416, 2004-11-02)
gsm_13200bps\src\gsm_implode.c (6042, 2004-11-02)
... ...
/*
* 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.
*/
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
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