Displaying 20 results from an estimated 469 matches for "vad".
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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 says VAD can work without VBR enabled.
But I found it's not...
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...
2010 May 06
1
question about rolling regressions
Hi All,
I am using R 2.11.0 on a Ubuntu machine. I have a time series data set and
want to run rolling regressions with it. Any suggestions would be useful.
Here are the details:
(1) I convert relevant variables into time series objects and compute first
differences:
vad <- ts(data$ALLGVA/data$GDPDEF, start=1948, frequency=1)
emp <- ts(data$ALLEMP, start=1948, frequency=1)
vad.dif1 <- diff(vad)
emp.dif1 <- diff(emp)
(2) I make a data set:
d <-
ts.union(emp.chng=emp.dif1,lag.emp.chng=lag(emp.dif1,-1),twolag.emp.chng=lag(emp.dif1,-2),
vad.chng=vad.d...
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 itself) that
explains how the lat...
2007 Feb 27
2
Preprocessor denoise. Does it work?
There are many ways to implement a VAD. What you described is actually
perfectly equivalent to the most trivial (and least robust) VAD algorithm.
Jean-Marc
Andy Ross wrote:
> Ton Grandgent wrote:
>> Andy Ross wrotte:
>>> I wrote a trivial squelch feature* in 10 minutes that works
>>> basically 100% of the t...
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...
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 equipment. Most won't.
RFC3389 states tha...
2005 Mar 08
0
VAD with speex_preprocess()
As I understand it, there are two separate ways to get VAD information
from Speex: 1) Using the encoder. 2) Using speex_preprocess(). I
present the following observations from an application developer's
perspective. They may be wrong, in which case I would appreciate
corrections.
- The two VAD systems are implemented differently.
- speex_prepr...
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/...
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
> > asynchronously? The current API seems to imply that some kind of
> > polling is required to determine the voice/non-voice...
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 the...
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?...
2009 Jul 27
2
VAD performance worse on version 1.2rc1 than 1.1.12
...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 have seem on speex sources that the VAD is under reconstruction, but I
don't understand why it has been replaced with that poor one and it hasn't
been repaired after 2 years from 1.2beta1.
Is there a way to use the VA...
2008 May 14
1
preprocesssor questions
...f questions regarding the preprocessor:
1) I looked at the source code. Even though I am an experienced programmer
it looks like Chinese to me ;-) What would I have to do to modify / tweak
the audio processing code for my needs? Are there documents describing the
algorithms applied for AGC, NS and VAD or does one have to understand the
source code? How do people help you modifying the library - do they
magically understand the code?
2) I run the preprocessor it seems to take the same amount of time to run
VAD+NS+AGC as if I only run VAD. Is it possible to restructure the code in a
way that sav...
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 lin...
2004 Aug 06
2
--dtx alone does nothing?
I'm running a:
for band in n w u
do
for quality in 0 1 2 3 4 5 6 7 8 9 10
do
for complexity in 3
do
for vad in "" "--vad"
do
for dtx in "" "--dtx"
do
echo speexenc -${band} --quality ${quality} --comp ${complexity} ${vad} ${dtx} input.${band}.wav output.${band}.${quality}.${complexity}.${vad%%--}.$...
2008 Dec 15
0
preprocessor VAD only rocognize between silence andnot silence
Jesus,
Unfortunately, FFT and magic algorithms don't work (yet?). You
might want to try this if you're not satisfied with Speex VAD:
http://lists.xiph.org/pipermail/speex-dev/2008-August/006860.html
It won't perform any miracles, but I think it works pretty well
and is easy to tweak.
Tom
>---- Original Message ----
>From: jmorion at toomeeting.com
>To: speex-dev at xiph.org
>Subject: Re: [Speex-dev] preproc...
2004 Sep 27
2
Speex VAD algorithm
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<P><FONT SIZE=2 FACE="Arial">Could anybody tell me where I can find the algorithm description behind the Speex VAD implementation?</FONT>
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2005 Dec 26
2
Fixed-point VAD?
Hi,
I found this message concerning VAD and was wondering whether VAD has been
ported to fixed-point in the latest version?
Thanks,
SingHui
---------- Forwarded message ----------
From: Jean-Marc Valin <Jean-Marc.Valin@usherbrooke.ca>
Date: Jul 22, 2005 1:02 AM
Subject: Re: [Speex-dev] Fixed-point
To: gue baja <gue_baja@yahoo....
2009 Aug 10
2
VAD performance worse on version 1.2rc1 than 1.1.12
Hi Cecile,
it seems it is a tabu theme, or nobody uses VAD on speex. I've tried
with external EasyVAD solution but the result was not as spected.
Other users of the list suggest an algorithm to filter voice based on
the power of the signal, but of course, it is not a voice activity
detection.
I am waiting also a solution for this, while so I use ve...