opal-v2_1beta0-src
所属分类：IP电话/视频会议
开发工具：C/C++
文件大小：3809KB
下载次数：30
上传日期：2005-09-22 16:55:46
上 传 者：
duyx
说明： opal-v2_1 h.323协议栈，支持h.323和sip.
(silica-v2_1 H.323 protocol stack, support H.323 and sip.)
文件列表:
opal (0, 2004-10-08)
opal\.cvsignore (105, 2004-04-25)
opal\ChangeLog (135063, 2004-10-08)
opal\configure (123446, 2004-06-04)
opal\configure.exe (184320, 2004-03-23)
opal\configure.in (7838, 2004-10-06)
opal\include (0, 2004-10-08)
opal\include\asn (0, 2004-10-08)
opal\include\asn\.cvsignore (178, 2004-02-19)
opal\include\asn\gcc.h (130284, 2004-06-04)
opal\include\asn\h225.h (218401, 2004-06-04)
opal\include\asn\h235.h (27520, 2004-06-04)
opal\include\asn\h245.h (419825, 2004-06-04)
opal\include\asn\h248.h (110222, 2004-06-04)
opal\include\asn\h4501.h (17832, 2004-06-04)
opal\include\asn\h45010.h (3384, 2004-06-04)
opal\include\asn\h45011.h (12891, 2004-06-04)
opal\include\asn\h4502.h (17912, 2004-06-04)
opal\include\asn\h4503.h (6414, 2004-06-04)
opal\include\asn\h4504.h (6961, 2004-06-04)
opal\include\asn\h4505.h (16007, 2004-06-04)
opal\include\asn\h4506.h (2045, 2004-06-04)
opal\include\asn\h4507.h (8727, 2004-06-04)
opal\include\asn\h4508.h (4839, 2004-06-04)
opal\include\asn\h4509.h (6169, 2004-06-04)
opal\include\asn\h501.h (75057, 2004-06-04)
opal\include\asn\mcs.h (58044, 2004-06-04)
opal\include\asn\t38.h (12902, 2004-06-04)
opal\include\asn\x880.h (9154, 2004-06-04)
opal\include\codec (0, 2004-10-08)
opal\include\codec\allcodecs.h (2493, 2004-05-15)
opal\include\codec\g711codec.h (3637, 2002-09-16)
opal\include\codec\g726codec.h (8275, 2004-09-01)
opal\include\codec\g729codec.h (4633, 2004-02-23)
opal\include\codec\gsmcodec.h (5415, 2002-11-10)
opal\include\codec\h261codec.h (13605, 2004-03-11)
opal\include\codec\ilbccodec.h (5190, 2004-09-01)
opal\include\codec\lpc10codec.h (5837, 2004-09-01)
opal\include\codec\mscodecs.h (7376, 2004-03-11)
opal\include\codec\opalwavfile.h (4550, 2004-07-15)
... ...
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.
近期下载者：
相关文件：
收藏者：