I wondered how long before someone started asking about that. That was all about creating a hook into Asterisk where it would stream the audio over a socket to another program (which was a custom program we wrote, but similar to the Sphinx example programs). The Sphinx program could do the voice recognition and possibly return a result to Asterisk over the socket, in the form of a text token.Hi. I just started trying to play with Sphinx. I followed their site as far as running sphinx-server. It is listening on the default port. I copied sphinx2-simple to another file and changed sphinx2-continuous to sphinx2-server.
So, I ran eagi-sphinx-test under asterisk. What exactly is it supposted to do? Here's what I get:
The goal was to be able to route calls using voice recognition. It basically worked, except at the time we were having terrible problems with the Zap cards and echo. It was distorting the sound so horribly that it wasn't even human-recognizable, much less machine-recognizable. We've put that project on indefinte hold for now but it could possibly be usable again in the future. It's been many months since I worked on it so I'm a little rusty. If you used something like an ISDN line where you could get a clear signal it did pretty well. Of course it was only choosing between about 10 different words.
The eagi-sphinx-test program is basically a stub that has the necessary hook into Asterisk. We have a modified "Sphinx AGI" which is similar to the test program but just includes some of the logic of what we wanted it to do when it heard a token, etc..
As far as the Sphinx side of it goes, I actually posted the modification I made to Sphinx to read audio from a socket to the Sphinx mailing list. I was surprised that no one hardly seemed interested in it.
The stock "Sphinx server" doesn't read audio over the network. It only communicates the responses over the network. That's why I had to make the above-mentioned audio-socket-read modification.
- Matt
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