Displaying 20 results from an estimated 3000 matches similar to: "Regression in wideband encoding quality between b1 and rc1"
2009 Dec 16
1
Regression in wideband encoding quality between b1 and rc1
Hello Jean-Marc, and thanks a lot for your quick answer!
2009/12/16 Jean-Marc Valin <jean-marc.valin at usherbrooke.ca>:
> On 15/12/09 10:37, Blaise Potard wrote:
>>
>> Having recently upgrading to speex rc1, It occurred to us that there
>> seems to have been a regression in the quality of encoding since
>> version beta1.
>
> Just curious, did you identify
2009 Dec 16
0
Regression in wideband encoding quality between b1 and rc1
On 15/12/09 10:37, Blaise Potard wrote:
> Having recently upgrading to speex rc1, It occurred to us that there
> seems to have been a regression in the quality of encoding since
> version beta1.
Just curious, did you identify where exactly the regression occurred?
> We are compressing some 22khz wave files in wb mode with maximum
> quality / complexity in VBR, and the result was
2004 Aug 06
2
narrowband embedded in wideband
Is there any way to access only the narrowband portion of a wideband
stream?
I'd like to be able to encode the audio only once, but allow members
in a conference to have some rough selection of bandwidth, and allow
them to move to a lower-bitrate stream if there is a need to do so.
Thanks,
Matthias
--
Matthias Granberry
matthias@utdallas.edu
(469) 371-0596
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List archives:
2004 Aug 06
1
narrowband embedded in wideband
It looks like I'll need to go further into the guts of speex to do
this. I do, however, see some lines in nb_celp.c/nb_decode() that
look interesting. I guess I'll play with it. I doubt that it will be
terribly clean, though.
Jean-Marc: Take a look at line 1195 in nb_celp.c (CVS). It reads
"speex_warning ("More than to wideband layers found: corrupted
2005 Sep 08
1
ultra wide band packet questions
Hi Jean Marc and List,
So I have started finally fiddling around with Ultra-wideband mode.
It appears to be very similar in operation to Wide mode, except that
when peering into the packet structure it looks like (and these are
kind of questions as much as statements here):
1. update rate 0 is not used in UWB- only 1-4?
2. The total bits used for each UWB update rate seem to be as follows:
2007 Jul 23
2
uwb bitrates
Hello
I just wrote a little application using speex. I am compressing and packing singel frames to transmit them. Now I read in the manual, that it's possible to achieve higher bit rates by packing more than one frames at once. Unfortunately there is no table included at the manual, that shows the "real" bitrates of ultra wide band mode. So my question is: Can someone provide that
2004 Aug 06
2
Speex 1.0.1 is out
Hi everyone,
I just released Speex version 1.0.1 with a major bugfix to the wideband
mode. It's highly recommended for people using wideband Speex to
upgrade. Also, since the old encoder and decoder had the bug, you may
notice that files encoded with 1.0 have a lower quality when decoded
with 1.0.1. For that reason, re-encoding might be a good idea. Note that
narrowband is not affected by
2006 May 10
2
frame size
Hi,
Can someone please tell me how should I go about changing the frame size which is hardcoded to 160 for NB and WB and 320 for UWB.
For NB speech(8KHz) the framesize of 160 is 20ms frame but for WB and UWB its 10ms.
What are the parameters being affected by simply changing the framesize and sub-frame size in "modes.c"
How to change the buffer size and how its affected.
can we have a
2010 Feb 20
1
Manual scratch allocation : memory usage doubt
Hi,
I am currently encoding 32 Khz/Qual-10/UWB encode mode, with
MANUAL_ALLOC enabled ( similar to the c5x/c6x configuration).
In file sb_celp.c, I noticed the scratch memory grow during
recursive (UWB -> WB) calls to 'sb_encode'.
1. 'stack' was not tracked (with 'tmp_stack' as done at other palaces)
after/before - auto-correlation/Levinson-Durbin scope (~line
2008 Nov 14
3
SPEEX on iPhone ?
----- Original Message -----
From: "Alexander Chemeris" <Alexander.Chemeris at sipez.com>
To: "Vincent Burel" <vincent.burel at vb-audio.com>
Cc: "Conrad Parker" <conrad at metadecks.org>; <speex-dev at xiph.org>; "Jean-Marc
Valin" <jean-marc.valin at usherbrooke.ca>
Sent: Thursday, November 13, 2008 11:31 PM
Subject: Re:
2005 Oct 25
2
Noisy sound quality with Blackfin in WB-mode
Hello all,
I'm testing the Speex codec for my diploma thesis on a BF-533 Blackfin under
uCLinux (2005R3 RC3 release). I successfully compiled the Speex (1.1.11-svn)
and I can encode/decode wav-files on my STAMP-board using the speexenc/speexdec
sample apps. But I encountered that the decoded file sounds strange/noisy, when
compiling with "--enable-blackfin-asm" +
2012 Mar 14
4
converting unsigned short sample to signed short sample
Thanks a lot for replying,
The question now is , after subtracting 32767 from each unsigned sample, will the new signed samples represent the same original voice ?
???? For explanation, assume "Hi" is said in 8000 unsigned sample ,if i subtract 32767 from each sample and play the resulting 8000 sample as signed PCM samples,will they be "Hi" ?!
Forgive me about my questions ,
2006 Nov 21
2
Re: One bug in the SVN and rtp wrapper issue
if the new draft in the manual is used. I don't find how to tell the
decoder which mode(NB/WB/UWB) is used
in the encoder. The RTP header don't contain the mode field and I don't
find the mode information in the
coded frame either.
Does this mean we have to use NB decoder in all cases?
Lianghu
On 11/22/06, Jean-Marc Valin <jean-marc.valin@usherbrooke.ca> wrote:
>
>
2006 Mar 14
1
Encoding mode
Hello,
In the internet draft describing the SDP parameters for speex
I find this:
mode: Speex encoding mode. Can be {1,2,3,4,5,6,any}
defaults to 3 in narrowband, 6 in wide and ultra-wide.
In the documentation I can only find the following request:
SPEEX_SET_MODE
There is no description though what this request does.
I think the mode somehow maps to the bitrate, but I
2004 Aug 06
3
Chopping off the wideband?
If I encode something in ultra-wideband, can I decode it in wideband by
chopping off bytes in every frame?
John
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2004 Aug 06
2
speed and memory
hello,
i switched to use the encoder.processData() and
encoder.getProcessedData() of jspeex. however it looks to me like a
memory leak ... memory usage is increasing very fast and there is no
visible stop ... after about five minutes java.lang.OutOfMemory occurs.
I think it must be the jspeex component, because before i added jspeex
to my app usage was constant at about 5mb.
is it possible
2006 Jan 09
1
Bitrate at ultra wideband
Hello everyone.
I would like to know which are the available bitrate using the ultra-wideband compression.
Thank you!
Paolo
Gruppo Telecom Italia - Direzione e coordinamento di Telecom Italia S.p.A.
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2004 Aug 06
1
wideband bitrates
Hi,
I found this list of Speex bitrates in the mail archive.
http://www.xiph.org/archives/speex-dev/200306/0004.html
Can somebody confirm that this list is correct?
I am wondering about the following:
- On the Speex website it says: "Speex is based on CELP and is designed to
compress voice at bitrates ranging from 2 to 44 kbps."
while the bitrates listed here are e.g. 84400 for
2004 Aug 06
3
Chopping off the wideband?
On Tue, Feb 18, 2003 at 06:09:43PM -0500, Jean-Marc Valin wrote:
> Le mar 18/02/2003 ? 17:38, John Hayes a ?crit :
> > If I encode something in ultra-wideband, can I decode it in wideband by
> > chopping off bytes in every frame?
>
> All you have to do is use the --force-wb switch with speexdec. It will
> decode as if the file were wideband, ignoring the ultra-wideband
2007 May 02
2
Re: Sending speex over a network
Hi All,
In sampleenc.c and sampledec.c, if I change the FRAME_SIZE to any other
value, I get very garbled speech. Can anyone tell me if I need to set
something else if I would like to change the frame size ?
Thanks
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