Posted: Mon Nov 27, 2006 11:54 pm Post subject: [asterisk-speech-rec] Problem with background noise: Tips on
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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Posted: Tue Nov 28, 2006 12:12 am Post subject: [asterisk-speech-rec] Problem with background noise: Tips on
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.
-----Original Message-----
From: asterisk-speech-rec-bounces@lists.digium.com
[mailto:asterisk-speech-rec-bounces@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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Posted: Tue Nov 28, 2006 12:25 am Post subject: [asterisk-speech-rec] Problem with background noise: Tips on
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@lumenvox.com> wrote:
Quote:
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.
-----Original Message-----
From: asterisk-speech-rec-bounces@lists.digium.com
[mailto:asterisk-speech-rec-bounces@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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