Speex dev - Jan 2007 - 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 don't feel problem so much while continuous speech, but when we
speak for short intervals, the start of and end of sentences have clatter
(maybe clatter does not meet that sound, there is a defect). To overcome
this problem, are SPEEX_PREPROCESS_SET_PROB_START,
SPEEX_PREPROCESS_SET_PROB_CONTINUE parameters or other anything useful? 

 

int param_enabled = 1;

int param_disabled = 0;

int sampling_rate = 8000;

SpeexPreprocessState *preprocess;

 

preprocess = speex_preprocess_state_init(frame_size, sampling_rate); /*
frame_size = 160 */

speex_preprocess_ctl(preprocess, SPEEX_PREPROCESS_SET_DENOISE,
&param_enabled);

speex_preprocess_ctl(preprocess, SPEEX_PREPROCESS_SET_VAD, &param_enabled); 

speex_preprocess_ctl(preprocess, SPEEX_PREPROCESS_SET_AGC, &param_disabled);

 

/* inputAdd is address of captured input voice (short *).

is_speech_in_preprocessor = speex_preprocess(preprocess, inputAdd, null);

if (is_speech_in_preprocessor != 0)

{

      speex_encode_int(enc_state, inputAdd, bitsAdd);

}

 

 

Thanks a lot in advance,

Sincerely,

Yasemin

 

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> 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 don't feel problem so much while continuous speech, but when
we
> speak for short intervals, the start of and end of sentences have clatter
> (maybe clatter does not meet that sound, there is a defect). To overcome
> this problem, are SPEEX_PREPROCESS_SET_PROB_START,
> SPEEX_PREPROCESS_SET_PROB_CONTINUE parameters or other anything useful? 
These would be the parameters to tweak. Most likely though, it mainly
comes down to improving the VAD code.

	Jean-Marc
>  
> 
> int param_enabled = 1;
> 
> int param_disabled = 0;
> 
> int sampling_rate = 8000;
> 
> SpeexPreprocessState *preprocess;
> 
>  
> 
> preprocess = speex_preprocess_state_init(frame_size, sampling_rate); /*
> frame_size = 160 */
> 
> speex_preprocess_ctl(preprocess, SPEEX_PREPROCESS_SET_DENOISE,
> &param_enabled);
> 
> speex_preprocess_ctl(preprocess, SPEEX_PREPROCESS_SET_VAD,
&param_enabled);
> 
> speex_preprocess_ctl(preprocess, SPEEX_PREPROCESS_SET_AGC,
&param_disabled);
> 
>  
> 
> /* inputAdd is address of captured input voice (short *).
> 
> is_speech_in_preprocessor = speex_preprocess(preprocess, inputAdd, null);
> 
> if (is_speech_in_preprocessor != 0)
> 
> {
> 
>       speex_encode_int(enc_state, inputAdd, bitsAdd);
> 
> }
> 
>  
> 
>  
> 
> Thanks a lot in advance,
> 
> Sincerely,
> 
> Yasemin
> 
>  
> 
> 
> 
> 
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> 
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