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

[Tom [toms400]]

Randal,
Thanks.  That's the parameter I've been toying with.  I've got it up
at 2000, but I'm still having problems.  Even though I've uttered a
word in the grammer, the engine continues to accept input until the
timeout is reached - the confidence score is usually 0 in this case.
The utterance may be correctly decoded but there's also a long string
of UHs, BREATHS, LAUGHS, etc.

By answer audio do you mean 'decoded audio'?  I'm using the beta
version of the tuner.  Is there any way to vary the vad_noise_floor in
the Tuner?

At what level do you typically set vad_noise_floor?
Thanks

On 11/27/06, Randal Rand <RandalRand at lumenvox.com> wrote:
> 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
>
> Tell us what is important to you!  Take our product development survey:
> http://www.LumenVox.com/survey/srDevelopment/index.asp
>
> -----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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