Displaying 20 results from an estimated 5000 matches similar to: "VAD Algorithm"
2007 Jun 24
2
VAD Algorithm
Steve Underwood a ?crit :
> Coffey, Michael wrote:
>> Has it been a whole week since a question about VAD? :-)
>>
>> I am curious why the VAD algorithm described in G.729 Annex B is not
>> used by Speex. Complexity, Patent, Quality, or what?
>>
> Its not only patented, its so darned good they recently threw it out and
> replaced it. :-) I assume the
2007 Jul 02
1
Backup Echo Suppression
Millions of ordinary people have systems that do not meet your stringent specifications.
It does not matter what OS you or I use. It's the customers for whom this work is done.
-----Original Message-----
From: Jean-Marc Valin [mailto:Jean-Marc.Valin@USherbrooke.ca]
Sent: Monday, July 02, 2007 6:35 PM
To: Coffey, Michael
Cc: speex-dev@xiph.org
Subject: RE: [Speex-dev] Backup Echo Suppression
2007 Jul 02
1
Backup Echo Suppression
Jean-Marc,
I think I can speak for most everyone here when I say we appreciate *very
much* your code beyond the codec that helps people who use Speex in real
applications. How far you want to take that code is up to you, of
course. (And contributors, to a degree.)
I don't think any reasonable person is expecting your code to solve
everything. But when people are running up against
2007 Jul 02
3
Backup Echo Suppression
Believe me; I've "played with" priorities and buffering.
Did you just say you have no idea how the Speex residual echo suppressor works? If that is the case, can you tell me where I could get some information about it?
-----Original Message-----
From: Jean-Marc Valin [mailto:jean-marc.valin@usherbrooke.ca]
Sent: Friday, June 29, 2007 7:38 PM
To: Coffey, Michael
Cc:
2005 Jul 20
4
Alternatives to Digium 729
Per my conversation below with digium, are there any legal alternatives
to digium's G729? It is out of date, and doesn't support VAD nor silence
detection.
Digium has stated that they have no plans to update it anytime soon.
VAD/Silence is a big deal with major carriers and we are having to fight
a battle to get them to make special arrangements to turn off
VAD/Silence in their
2010 Sep 04
1
Possible malformed G729B - SID (VAD/DTX) frames from carrier endpoint ?
Hello,
We are in the process of debugging a voice quality issue for a client of
ours that is a VoIP services provider. The client uses a softphone that
runs on a pjsip stack.
When placing a call using the softphone, it negotiates the use of G729
codec with the remote endpoint (ptime = 20ms). The endpoint transmits RTP
packets with encoded G729 payload. VAD/DTX is enabled. We see that the
last
2004 Sep 27
2
Speex VAD algorithm
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2007 Jul 02
0
Backup Echo Suppression
Selon "Coffey, Michael" <mcoffey@avistar.com>:
> Believe me; I've "played with" priorities and buffering.
Then either you haven't played well enough or you're using a braindead OS.
> Did you just say you have no idea how the Speex residual echo suppressor
> works? If that is the case, can you tell me where I could get some
> information about it?
2004 Aug 06
1
VAD algorithm ?
Hello,
I am working with speex codec, especially its VAD part. I need to know what
algorithm it is using for silence detection and where I can get some
documentation for it.
I will be very greatful for your help.
-Abhishek
2006 Oct 24
1
Does VAD/DTX work without VBR and Preprocessor
Hi Marc,
Thanks for your quick response.
So if VAD is enabled then VBR will be enable although it's a special VBR.
How about take out the VAD code from the VBR and remove the code else?
Lianghu
On 10/24/06, Jean-Marc Valin <jean-marc.valin@usherbrooke.ca> wrote:
>
> > 1) there are VAD related codes in the source file preprocess.c.
> > Will VAD still work If I
2007 Jun 29
2
Backup Echo Suppression
I realize that the preprocessor echo suppression is not designed
specifically to counter the effects of data loss. On the other hand, as
much as I might like to, I do not have the option to "fix that problem
for real." The sad truth is that some end users have systems that may
drop samples, or do other unfathomable things, no matter what I do. I
can not rewrite their drivers, firmware,
2006 Oct 24
2
Does VAD/DTX work without VBR and Preprocessor
Hello,
I'm try to run speex on some ARM processor.
I'd like to cut away some speex features including VBR, ABR and preprocessor
while still supporting VAD/DTX.
But I've found some puzzles in the source code regarding VAD as below,
1) there are VAD related codes in the source file preprocess.c.
Will VAD still work If I don't use the source file preprocess.c?
2)The speex manual
2009 Mar 17
1
VAD speex 1.2rc1
My data is speech sampled as pcm mono 32khz.
I want to use vad for regulating the agc gain mechanism.
So... if voice is not detected I just reduce the agc value
in order to not amplify the 'silence' otherwise we just
increase the agc value if it is below the minimum.
Thanks,
Daniel
----- Original Message -----
De: Jean-Marc Valin <jean-marc.valin at usherbrooke.ca>
Para: danflu at
2007 Jun 07
2
VAD Questions
Hello all:
I am interested in using Speex for an application that streams audio
from a (noisy) source, so I am interested in VAD and DTX operation.
However, after browsing the archives of this list, I note that a
number of people have not been satisfied with the operation of the VAD
algorithm in Speex. This leads me to a few questions:
- Is there a reference somewhere (other than the source
2008 Aug 19
2
size of speex packets when VAD/CNG is enabled
Hi all,
supposing to have speex working at 3.95, when VAD/CNG is employed, which
is the size of those "silence" samples respect to voice samples?
I am wondering if it could be possible to lower even the transmission of
VAD/CNG samples by specifying "outbound" in the communication channel
only 1 bit instead of sending the whole VAD/CNG packet.
I am doing the same for AMR
2007 Jun 08
2
VAD Questions
Hello Jean-Marc et al:
On 07/06/07, Jean-Marc Valin <jean-marc.valin@usherbrooke.ca> wrote:
> > - Is there a reference somewhere (other than the source itself) that
> > explains how the latest VAD algorithm works?
>
> Read the source, Luke :-) (sorry)
Okay. I had to ask :-)
>
> > - Is it possible to obtain the VAD status of a Speex stream
> >
2007 Aug 25
1
asterisk and vad/cng
Hi List,
i've set up a cisco 7912 for my asterisk box. I've had problems with
VAD and CNG. After googling a bit, i've found an article about asterisk
not supporting these two protocols, therefore it's better to turn them off.
Since then i did not found answer to my two questions, maybe somebody
here could help me:
a) am i even able to turn off vad/cng on cisco 7912? SIP
2008 Dec 11
1
preprocessor VAD only rocognize between silence and not silence
Hello,
in my project im using speex 1.2rc1 and the preprocessor VAD seems to
only separate complete silence from not complete silence frames.
The Speex Manual, you can read "The voice activity detector (VAD)
provided by the preprocessor is more advanced than the one directly
provided in the codec."
but if you go to the source code in preprocess.c line 995 "/* FIXME:
This VAD
2003 Oct 14
2
VAD in Asterisk ?
Hi,
Is there is some form of VAD on * for SIP channels, cause I have a
problem with MOH. I made an extension which simply plays MOH, when I
dial that extension with my ATA188 MOH sounds choppy if I talk on the
phone the MOH keeps playing.
I saw the sip channel (show channel SIP/*) and I see no packets going
in/out when I talk then packets shows going in/out.
I don?t have this kind of problem
2009 Jul 27
2
VAD performance worse on version 1.2rc1 than 1.1.12
Hi, I decide to write to the list because of a strange behaviour when
updating from version 1.1.12 to 1.2rc1.
My software was running fine with version 1.1.12, but now I want to benefit
from advances on AEC.
After updating the library to 1.2rc1 and do few changes on my sources, I run
the application and discovered that VAD doesn't work so fine as in previous
version 1.1.12 (3 years ago).
I