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...the source itself) that explains how the latest VAD algorithm works? - Is it possible to obtain the VAD status of a Speex stream asynchronously? The current API seems to imply that some kind of polling is required to determine the voice/non-voice status. - Does the VAD algorithm implement syllabic/sonorant rate detection, as has been implemented many times in analog circuitry, and is described in this (and other) papers? http://people.csail.mit.edu/jrg/2005/IS05_schutte.pdf - Over what time period is VAD done? Is it done on a frame by frame basis or over some longer period? Thank you, -- Larry G...

...cates whether the encoded data contains speech or not? The API has a "get VAD status", but it seems like that might only indicate whether VAD is currently enabled. Perhaps the VAD status is contained somewhere in the data frames? > > > - Does the VAD algorithm implement syllabic/sonorant rate detection, > > as has been implemented many times in analog circuitry, and is > > described in this (and other) papers? > > http://people.csail.mit.edu/jrg/2005/IS05_schutte.pdf > > As far as I understand, the paper you reference above isn't applicable > to th...

...sly? The current API seems to imply that some kind of > polling is required to determine the voice/non-voice status. Don't understand your question. Also which VAD are you talking about? The one in the encoder or the one in the preprocessor? > - Does the VAD algorithm implement syllabic/sonorant rate detection, > as has been implemented many times in analog circuitry, and is > described in this (and other) papers? > http://people.csail.mit.edu/jrg/2005/IS05_schutte.pdf As far as I understand, the paper you reference above isn't applicable to the problem here. Basically, we...

...return value of either speex_encode() or speex_preprocess_run(). > Okay. What I was trying to determine was whether or not the speech > detection was done with something more sophisticated than frame > energy. As you said above, I'll have to look at the sources. For many > systems, sonorant energy rate detection is used to detect voice, even > under very poor SNR conditions. I *do* use more than the frame energy. I use the pitch and (IIRC) one of two other things. However, it's still *very* hard to do any sort of good detection based only on 20 ms. Give me 1 second of laten...

...or speex_preprocess_run(). OK. Thanks. > > > Okay. What I was trying to determine was whether or not the speech > > detection was done with something more sophisticated than frame > > energy. As you said above, I'll have to look at the sources. For many > > systems, sonorant energy rate detection is used to detect voice, even > > under very poor SNR conditions. > > I *do* use more than the frame energy. I use the pitch and (IIRC) one of > two other things. However, it's still *very* hard to do any sort of good > detection based only on 20 ms. G...

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