Displaying 20 results from an estimated 5000 matches similar to: "VAD encoder sensitivity?"
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
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
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
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 Aug 06
1
DTX and VAD doesn't work on one of my computers.
Hi there,
I enable DTX and VAD in speex_encode to detect whether there is silence in voice data. But the same programme got different result on my computers. The function speex_encode always return 38 on one of my computers although it is silence. On all other computers the function speex_encode return 1 when it is silence. It means DTX and VAD doesn't work on particular OS or PC. Do anyone
2007 Jan 08
1
VAD in preprocessor
Hi all and Jean-Marc,
Firstly thanks a lot to you for helps, at last I accomplished to use
speex-1.2beta1 in my speech application. I try to understand speex source
code and improve speech quality. The problem in my application (like many
people in the list says) is noise. So I've added VAD in preprocessor as
following. VAD in preprocessor is very good, there is not noise outside
speech. I
2010 Feb 26
2
Decoding multiple frames
Hi all,
I'm using speex through my own python wrapper based on ctypes. In my application I'm forced to process relatively large chunks of audio data (250ms). I was able to supply sufficiently large buffer to the SpeexBits structure and then encode using (code snippet)
_speex.speex_bits_reset(byref(self.bits))
for i in range(0, len - self.frameSize, self.frameSize):
2004 Aug 06
1
rgding VAD
On Tue, 2003-04-15 at 11:31, Jean-Marc Valin wrote:
> > How do i detect whether there is silence in media using speex?
> > Is there any API which decides that the audio data only contains
> > silence?
> > Basically i will have PCM linear data, I want to know whether it is
> > complete silence.
>
> Well, the best way is probably to turn VAD *and*
2004 Aug 06
1
DTX and VAD doesn't work on one of my computers.
Dear Jean,
Thank you so much for reply my message.
I am sorry the function return 38 is speex_bits_write(). This function doesn't work on one of my computers. But after I add the function speex_preprocess(), it works well. I am wondering what is the possible reason? What the function speex_preprocess() does?
Another problem I have now is when I enable dtx and vad with function
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
2005 Apr 26
1
tgAudioCodec.zip
Jean-Marc,
Ok, I understand. It's floating point but I don't have a mechanism
in place yet to capture the source data. I'll do that, reproduce the
problem, and put together a minimal sample program that can reproduce
it given a data file.
Thanks,
Tom
Jean-Marc Valin <Jean-Marc.Valin@USherbrooke.ca> wrote:
>
> Hi Tom,
>
> In order to trace the problem,
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
2005 Sep 02
2
DTX mode using preprocessor?
Could a method be added to use the VAD from the preprocessor to send the
packet with the 'dtx_enable' flag in it, so the decoder on the other end
knows it's in dtx mode? (and SPEEX_GET_DTX_STATUS returns 1)
At the moment, I can hack around it by doing something like:
if (VAD for prev frame && ! VAD for this frame) {
iArg = 0;
2016 Oct 04
2
encoder with FEC+DTX enabled but not detecting noise
Hi,
When we pass around 9K samples of only ambient noise (no voice), the
encoder which is enabled FEC+DTX is detecting only some 140 frames as
non-voice (returning only TOC, no frame content). We were expecting all or
more to be identified as non-voice.
Our idea was to check how the decoder re-generates the original ambient
noise during the silence duration (when we feed NULL to decoder) when
2004 Aug 06
2
DTX in speech
Hello,
I am trying to use the DTX feature of speex to tell if the user is
speaking. I have VBR, DTX and VAD turned on, but the function
speex_encode always returns a non-zero value. It is my understanding
that it should return a zero value when the encoder detects silence?
Could anyone give me any clues to help figure out why this isn't working
for me? I am using the 1.13 version of speex on
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
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
2004 Aug 06
2
rgding VAD
hi,
How do i detect whether there is silence in media using speex?
Is there any API which decides that the audio data only contains
silence?
Basically i will have PCM linear data, I want to know whether it is
complete silence.
Is it that during encoding speex_bits_write will return a lesser
number if the audio at byte_ptr contains silence?
thanx,
Rahul
--
Rahul Arvind Jadhav
2012 Jan 20
1
speex_encode_int performance iphone4 + iOS5
Hi,I'm having performance issues encoding with speex on an iphone4 + iOS5. The same code yields excellent results on iPad2 + iOS5, Mac OS X 10.6 as well as Windows 7. The call to speex_encode_int is takes 0.0065 to complete. Because encoding is so latent the receiver incurs underruns.
Here is my speex setup:
? ? unsigned val = 0;
? ? /**? ? ?* Initialize the encoder in narrow band mode.? ?
2008 Feb 17
1
Voice activity detection
Thanks for your reply. I changed my code to:
if (speex_preprocess_run(preprocess_state, shortPointer) == 1)
{
speex_encode_int(enc_state, shortPointer, &enc_bits);
}
In the mobile version of the software, compiled against the mobile build of Speech, I get 1 and 0 based on whether the speech is detected. In the version of the software compiled against the Win32 version of Speex,