[Asterisk-Users] Voice detection

[Scott Stingel]

Hi Brad-

Yes, there's lots of voice detection software that exists - but not much
free software.  Last year, I had to pay an audio software engineer to
develop similar code for a project that I was working on.  Detecting voice
(or any kind of audio) is a matter of measuring the audio energy in the
particular bandwidth you're interested in over a short time period.

There is even software that can differentiate between a human speaking, and
a answering machine message which is longer and has a different "cadence"
than a human saying "hello" or answering with their name etc

Scott M. Stingel 
Emerging Voice Technology Inc.

Email:          scott at evtmedia.com <mailto:scott at evtmedia.com>   
URL:            www.evtmedia.com <http://www.evtmedia.com>   



> -----Original Message-----
> From: asterisk-users-admin at lists.digium.com 
> [mailto:asterisk-users-admin at lists.digium.com] On Behalf Of 
> Steve Underwood
> Sent: Friday, October 03, 2003 3:04 PM
> To: asterisk-users at lists.digium.com
> Subject: Re: [Asterisk-Users] Voice detection
> 
> 
> Hi Brad,
> 
> If you want to detect that a sound is voice, rather than 
> something else, 
> it isn't easy. There is information around on the Internet about 
> methods, but I have never tried them and don't know how well 
> they work. 
> Unless you have some understanding of DSP I wouldn't bother 
> trying. On 
> the other hand, if you do have some DSP expertise it might be a fun 
> thing to try.
> 
> Regards,
> Steve
> 
> Brad Waite wrote:
> 
> > Does anyone know if there's public voice detection algorithms 
> > available?  I've scoured the net for the last hour or so, 
> and I can't 
> > come up with anything except a few proprietary or embedded 
> solutions.
> >
> > I know dsp.c uses goertzel algorithms for DTMF detection, 
> but how does 
> > one detect voice?
> >
> > I dunno, maybe detecting voice isn't the way to go.  I want 
> to begin 
> > playback of a file after a phone/answering machine has answered.
> 
> 
> 
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