[asterisk-speech-rec] Problem with background noise: Tips onSetting Options in Lumenvox.conf

[Randal Rand]

Specifically the parameter you would want to increase is the
vad_noise_floor.  There are situations where noise in the background,
loud bursting sounds, can hit a certain frequency causing the engine to
recognize it as speech.  If you look at your calls with the Tuner
product you can see the requested audio and the answer audio; the answer
audio is after is has be scrubbed and normalized by our Speech Engine.
Also, be sure that confidence scores are in an acceptable threshold
before you allow the call to progress anything below that threshold
should be confirmed or if too low rejected.


Randal Rand
Speech Application Developer
LumenVox
P: 877-977-0707, just say "Randal"
F: 858-707-7072
RandalRand at LumenVox.com
www.LumenVox.com
 
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-----Original Message-----
From: asterisk-speech-rec-bounces at lists.digium.com
[mailto:asterisk-speech-rec-bounces at lists.digium.com] On Behalf Of Tom
[toms400]
Sent: Monday, November 27, 2006 3:54 PM
To: Discussing of speech recognition in Asterisk
Subject: [asterisk-speech-rec] Problem with background noise: Tips
onSetting Options in Lumenvox.conf

I've been having good results with the Lumenvox speech engine when there
is little to no background noise (i.e. people chatting in the
background, cars driving by when walking outside, etc.).  But, when
there is such background noise, the results are bordering on
unacceptable.  Ideally, I'd like the engine to not regard this noise as
speech input.

I've attempted to change some of the settings in lumenvox.conf,  and was
able to get some improvement over the default which was incredibily
sensitive.  But, I'm haven't gotten it to a point where I'm comfortable.

Can anyone recommend settings for lumenvox.conf or at least a systematic
way of setting the various options?  I've played a little with the
tuner, but don't understand how I can use it in this case.

Thanks
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