Speex dev - Nov 2006 - Integrating speex with VideoNet application: Constantbackground noise

Hi John,

I noticed the values after decode is very much different from the values of the
original PCM samples. For cases when the PCM sample values are constant (because
no one is speaking), the decoded values fluctuate too. These fluatuations are
causing the background noise. Is my observation expected?

Thanks,
Carine

----- Original Message ----
From: John Miles <jmiles@pop.net>
To: Carine Liang <carineliang@yahoo.com.sg>; speex-dev@xiph.org
Sent: Monday, 6 November 2006 11:52:53 AM
Subject: RE: [Speex-dev] Integrating speex with VideoNet application:
Constantbackground noise



 
DIV {
MARGIN:0px;}



It 
could be a million different things, unfortunately.  Focus on comparing 
your code to the Speex examples, and looking for places where they 
diverge.  Also, try taking Speex out of the picture altogether, just to 
make sure you can send plain uncompressed PCM audio through your network 
layer.  

 

-- 
john

RAD 
Game Tools


  -----Original Message-----
From: Carine Liang 
  [mailto:carineliang@yahoo.com.sg]
Sent: Sunday, November 05, 2006 
  4:51 PM
To: John Miles; speex-dev@xiph.org
Subject: Re: 
  [Speex-dev] Integrating speex with VideoNet application: Constantbackground 
  noise



  
  Hi,

I've 
  changed the m_waveFormatEx.wBitsPerSample for both record buffer and playSound
  buffer, changed my array from char to short and I'm still getting the same
  constant background noise. I notice that when I talk into the mike, I will get
  a slightly louder noise, can't hear any clear speech... Any idea
what's
  wrong?

Regards,
Carine







		
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The absolute values may be different for a variety of reasons; you can
hardwire them all to 0 to see if your noise goes away.  Make sure the values
on the decompressed (PCM) side are little-endian (low byte first in memory),
assuming you're working in Windows on x86.

-- john
RAD Game Tools
  -----Original Message-----
  From: Carine Liang [mailto:carineliang@yahoo.com.sg]
  Sent: Sunday, November 05, 2006 8:38 PM
  To: John Miles; speex-dev@xiph.org
  Subject: Re: [Speex-dev] Integrating speex with VideoNet application:
Constantbackground noise


  Hi John,

  I noticed the values after decode is very much different from the values
of the original PCM samples. For cases when the PCM sample values are
constant (because no one is speaking), the decoded values fluctuate too.
These fluatuations are causing the background noise. Is my observation
expected?

  Thanks,
  Carine


  ----- Original Message ----
  From: John Miles <jmiles@pop.net>
  To: Carine Liang <carineliang@yahoo.com.sg>; speex-dev@xiph.org
  Sent: Monday, 6 November 2006 11:52:53 AM
  Subject: RE: [Speex-dev] Integrating speex with VideoNet application:
Constantbackground noise


  It could be a million different things, unfortunately.  Focus on comparing
your code to the Speex examples, and looking for places where they diverge.
Also, try taking Speex out of the picture altogether, just to make sure you
can send plain uncompressed PCM audio through your network layer.

  -- john
  RAD Game Tools
    -----Original Message-----
    From: Carine Liang [mailto:carineliang@yahoo.com.sg]
    Sent: Sunday, November 05, 2006 4:51 PM
    To: John Miles; speex-dev@xiph.org
    Subject: Re: [Speex-dev] Integrating speex with VideoNet application:
Constantbackground noise


    Hi,

    I've changed the m_waveFormatEx.wBitsPerSample for both record buffer
and playSound buffer, changed my array from char to short and I'm still
getting the same constant background noise. I notice that when I talk into
the mike, I will get a slightly louder noise, can't hear any clear speech...
Any idea what's wrong?

    Regards,
    Carine




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Hi,

I'm experiencing weird problems while testing speex (I want to
test the echo canceller first) on PDA with WM5 version pocket PC 2005.

Here is the strange scenario:
1-> App running without being linked with speex -> no problem
2-> App running while being linked with speex -> crash at always the same
                                                  place.
     NO ACCESS TO SPEEX IS DONE.
3-> I remove the speex dependancies/clean all object -> crash at always
                                                         the same place
4-> reboot VisualStudio Application
5-> recompile everything without linking to speex: no crash....

I tried this several days: and retried those 5 steps several times. It's
amazing but is really the way it is.

I suspect a bug in Visual Studio, of course... As It seems some have 
already tried WM5, I wish to ask if they met such issue and solved it?
Just in case...

I also wish to test another application using speex to prove myself my 
application has a bug: if somebody has one, please send it.

Sorry for bothering you with probably non-speex problems,

Aymeric MOIZARD / ANTISIP
amsip - http://www.antisip.com
osip2 - http://www.osip.org
eXosip2 - http://savannah.nongnu.org/projects/exosip/