Re: Speex VAD always returning 1

I am using the speexenc as my testbed app.  I have also looked at this code but am uncertain as to why a zero input would allow this code to pass.  I am not sure what the statistics they are looking for.  Do you have information you can share as to how you normally perform this test?

Vas
________________________________________
From: [email protected] [[email protected]] On Behalf Of Yanick Bourbeau [[email protected]]
Sent: Monday, August 29, 2011 4:36 PM
To: [email protected]
Subject: Re: [Speex-dev] Speex VAD always returning 1

From 1.2rc1 source code:

preprocess.c:

/* FIXME: This VAD is a kludge */
st->speech_prob = Pframe;
if (st->vad_enabled)
{
if (st->speech_prob > st->speech_prob_start || (st->was_speech && st->speech_prob > st->speech_prob_continue))
{
st->was_speech=1;
return 1;
} else
{
st->was_speech=0;
return 0;
}
} else {
return 1;
}

AND

case SPEEX_PREPROCESS_SET_VAD:
speex_warning("The VAD has been replaced by a hack pending a complete rewrite");
st->vad_enabled = (*(spx_int32_t*)ptr);
break;


As you can see, it is a hack, not supposed to be very good. Still, weird that you get
this result. If you want a sample to test it, check speexenc.c file in speex source code package.
I usually implement this kind of feature outside of speex becauses I want a better control
on how it happens and when to do something about it :)

Yanick Bourbeau





On 11-08-29 04:16 PM, Clifton Craig wrote:
+1 on this question as I wanted to start playing with it as well.

On Aug 29, 2011, at 9:41 AM, Shridhar, Vasant wrote:

I have been trying to understand how to get the VAD algorithm working.  I sent an input stream of all zeros into the preprocessor but still got a return value of 1 indicating that speech was detected.  Is this feature not available with the latest release?  I thought at the very least it would detect this as silence and return 0 but that does not seem to be the case.

Does anyone have any information on how to use this or some example code to set this up I might try.

Thanks,

Vas
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