[Speex-dev] VAD in preprocessor

[Jean-Marc Valin]

> 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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