[Asterisk-Users] Voice detection

[Steve Underwood]

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.