Re: How does vad work?

From: robs [mailto:aquegg@...]
Sent: Sunday, June 03, 2012 11:49 AM
To: Damon Casale; sox-users@...
Subject: Re: [SoX-users] How does vad work?

From: Damon Casale <damonjcasale@...>
To: 'robs' <aquegg@...>; sox-users@...
Sent: Sunday, 3 June 2012, 16:01
Subject: RE: [SoX-users] How does vad work?

 

I’m already using norm along with vad.

 

What’s frustrating is that vad seems to perform *less* effectively at stripping silence than the “silence” option does.

 

"Vad" was developed—specifically because the approach taken by "silence" didn't seem up to this particular task—as a feature request from those running the language learning website http://language101.com, where AFAIK it's been successfully used with thousands of voice samples, in several different languages.  Here is the script that they used (which uses several other effects too):

http://sox.cvs.sourceforge.net/viewvc/sox/sox/scripts/voice-cleanup.sh?revision=1.1&content-type=text%2Fplain

That's not to say vad couldn't still be improved though. If the script still doesn't help, then please post the problematic sample.

Cheers,

Rob