Posted: Wed Aug 01, 2007 8:05 pm Post subject: [asterisk-speech-rec] New Voice Activity / Barge-in Paramete
As you probably heard if you're a LumenVox customer, we recently
released a new version of our Speech Engine (the 7.5.600 release) that
includes revamped voice activity detection (VAD) technology. VAD is what
lets the Engine separate background noises from a caller's speech.
The new VAD is significantly better than before. We tested it against a
very noisy set of audio where the old Engine failed to correctly
separate background noise from speech -- the new VAD correctly ignored
the noise 92% of the time. Because background noise and false barge-in
are significant problems for many users, we have seen these changes
improve overall accuracy by several percentage points in some
applications.
As part of these changes, some of the VAD parameters in lumenvox.conf
have changed with. Digium has just released b16 of
res_speech_lumenvox.so (the Asterisk-LumenVox connector module) which
supports these changes.
We have added two new parameters to control barge-in sensitivity:
vad_snr_sensitivity and vad_volume_sensitivity. Both are set on a scale
of 1-100 and default to 50.
vad_snr_sensitivity determines how much louder the speaker must be than
the background noise in order to trigger barge-in. The smaller this
value, the easier it will be to trigger barge-in.
vad_volume_sensitivity is the volume required to trigger barge-in. The
smaller the value, the more sensitive barge-in will be. This is
primarily used to deal with poor echo cancellation. By setting this
value higher (less sensitive) prompts that are not properly cancelled
will be less likely to falsely cancel barge-in.
We have removed vad_bargein_lvl and vad_noise_floor; if you attempt to
set them using 7.5.600 or later nothing will happen.
If you are a LumenVox user, we strongly recommend you upgrade to the
7.5.600 release of the Speech Engine and b16 of res_speech_lumenvox.
These downloads are available from our Web site at
http://www.lumenvox.com/customers/ by logging into your account and
clicking "Your Software Downloads."
If you haven't upgraded in a while, be aware that res_speech (the
generic Asterisk speech API) changed a few months ago, so if you're
using an older version of Asterisk 1.4 or a precompiled version of 1.2
(e.g. trixbox), you need to make sure you also have the latest version
of res_speech.
At this time, the 7.5 series is not supported on Asterisk Business
Edition. We are working with Digium to get this updated, and I'll be
sure to send a message to the list when this is the case.
I'll be happy to answer any questions about this release.
Stephen Keller
LumenVox Support
P: 877-977-0707, just say "Support"
F: 858-707-7072
Support@LumenVox.com www.LumenVox.com <http://www.lumenvox.com/>
<http://www.lumenvox.com/>
Winner "Best Innovation in Speech Recognition"
AVIOS SpeechTEK Award
_______________________________________________
--Bandwidth and Colocation Provided by http://www.api-digital.com--
Posted: Wed Aug 01, 2007 9:10 pm Post subject: [asterisk-speech-rec] New Voice Activity / Barge-in Paramete
Hi Steve
Thanks for the heads up on the new version.
Is it possible for lumenvox to do an upgrade guide.
I assume that as my installation is licenced I dont need to again ?
All I need to do is do a
yum install of the new licence server and engine then patch the new asterisk
bridge ?
is that correct ?
Ian Plain
Quote:
-----Original Message-----
From: asterisk-speech-rec-bounces@lists.digium.com
[mailto:asterisk-speech-rec-bounces@lists.digium.com]On Behalf Of
Stephen Keller
Sent: Wednesday, August 01, 2007 9:02 PM
To: Use of speech recognition in Asterisk
Subject: [asterisk-speech-rec] New Voice Activity / Barge-in Parameters
foruse with LumenVox
As you probably heard if you're a LumenVox customer, we recently
released a new version of our Speech Engine (the 7.5.600 release) that
includes revamped voice activity detection (VAD) technology. VAD is what
lets the Engine separate background noises from a caller's speech.
The new VAD is significantly better than before. We tested it against a
very noisy set of audio where the old Engine failed to correctly
separate background noise from speech -- the new VAD correctly ignored
the noise 92% of the time. Because background noise and false barge-in
are significant problems for many users, we have seen these changes
improve overall accuracy by several percentage points in some
applications.
As part of these changes, some of the VAD parameters in lumenvox.conf
have changed with. Digium has just released b16 of
res_speech_lumenvox.so (the Asterisk-LumenVox connector module) which
supports these changes.
We have added two new parameters to control barge-in sensitivity:
vad_snr_sensitivity and vad_volume_sensitivity. Both are set on a scale
of 1-100 and default to 50.
vad_snr_sensitivity determines how much louder the speaker must be than
the background noise in order to trigger barge-in. The smaller this
value, the easier it will be to trigger barge-in.
vad_volume_sensitivity is the volume required to trigger barge-in. The
smaller the value, the more sensitive barge-in will be. This is
primarily used to deal with poor echo cancellation. By setting this
value higher (less sensitive) prompts that are not properly cancelled
will be less likely to falsely cancel barge-in.
We have removed vad_bargein_lvl and vad_noise_floor; if you attempt to
set them using 7.5.600 or later nothing will happen.
If you are a LumenVox user, we strongly recommend you upgrade to the
7.5.600 release of the Speech Engine and b16 of res_speech_lumenvox.
These downloads are available from our Web site at
http://www.lumenvox.com/customers/ by logging into your account and
clicking "Your Software Downloads."
If you haven't upgraded in a while, be aware that res_speech (the
generic Asterisk speech API) changed a few months ago, so if you're
using an older version of Asterisk 1.4 or a precompiled version of 1.2
(e.g. trixbox), you need to make sure you also have the latest version
of res_speech.
At this time, the 7.5 series is not supported on Asterisk Business
Edition. We are working with Digium to get this updated, and I'll be
sure to send a message to the list when this is the case.
I'll be happy to answer any questions about this release.
Stephen Keller
LumenVox Support
P: 877-977-0707, just say "Support"
F: 858-707-7072
Support@LumenVox.com www.LumenVox.com <http://www.lumenvox.com/>
<http://www.lumenvox.com/>
Winner "Best Innovation in Speech Recognition"
AVIOS SpeechTEK Award
_______________________________________________
--Bandwidth and Colocation Provided by http://www.api-digital.com--
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Checked by AVG Free Edition.
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7/31/2007 5:26 PM
Posted: Thu Aug 02, 2007 2:49 pm Post subject: [asterisk-speech-rec] New Voice Activity / Barge-in Paramete
Ian wrote:
Quote:
Is it possible for lumenvox to do an upgrade guide.
I assume that as my installation is licenced I dont need to again ?
All I need to do is do a yum install of the new licence server and
engine then patch the new asterisk
bridge ?
This is correct. Using yum update should work just fine.
I'll see about getting explicit upgrade instructions added to the
documentation.
Thanks,
Stephen Keller
LumenVox Support
P: 877-977-0707, just say "Support"
F: 858-707-7072
Support@LumenVox.com www.LumenVox.com <http://www.lumenvox.com/>
<http://www.lumenvox.com/>
Winner "Best Innovation in Speech Recognition"
AVIOS SpeechTEK Award
_______________________________________________
--Bandwidth and Colocation Provided by http://www.api-digital.com--
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