[speex-dev] Kindly help me with VAD activation

[Tom Grandgent]

Hi,

I had the same experience.  The VAD done in the encoder does not 
seem to work very well at all.  However, the VAD done by 
speex_preprocess() works much better.  You will also get better 
results if you enable the denoiser, I think.

peex_preprocess_ctl(preprocess, SPEEX_PREPROCESS_SET_DENOISE, 
  &denoise_enabled);
speex_preprocess_ctl(preprocess, SPEEX_PREPROCESS_SET_VAD, 
  &vad_enabled);
speechDetected = speex_preprocess(preprocess, floatbuf, NULL);

Hope this helps,

Tom

Abhishek Parakh (abhishekp at ee.iitm.ac.in) wrote:
> 
> Hello.
> 
> I have generated a dll out of speex-1.1.4 using VC++6. I did not want all the
> ogg/wave header in the encoded stream. So I have replaced to codes of
> speexenc/dec with that of sampleenc/dec from the manual. Thus now the dll
> accepts the raw input, encodes it and returns the encoded data.
> 
> I also pass on nbBytes for each frame encoded to the decoder and no other
> information. 
> 
> I intialise the encoder in wb mode, put VAD on in encoder using
> speex_encoder_ctl. And also set all the other parameters such as quality,
> comp, etc. In the decoder I found only two controls, one for mode and other
> for speech enhancement. Thus I set those.
> 
> Now when I compile and run this dll with a test program. Every thing seems to
> be working fine but VAD is not coming ON. Why is it so? Also I have noticed a
> peculiar behavior that when I blow into the mike, VAD comes on. No matter how
> loudly I blow into it, however with no speech and complete silence VAD does
> not work.
> 
> Kindly, help with this. I have been trying to correct it since a long time now
> and still have no idea about the problem. I hav tried various machines and
> sound cards already.
> 
> - Abhishek
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