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abaci64 at gmail.com
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 Posted: Tue Mar 15, 2016 7:35 pm Post subject: [Freeswitch-users] Better results from mod_vmd |
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I just tried mod_avmd and mod_vmd and seem to have the same issue, my question is if someone has this working with Panasonic answering machine and Verizon Wireless (as well as other US wireless carriers) voicemail, what change if any should I apply to get it working.
Thanks for the help
On Thu, Aug 20, 2009 at 8:36 PM, Matthew Fong <mattdfong@gmail.com (mattdfong@gmail.com)> wrote:
| Quote: | I changed
/*! Minimum time for a beep. */
#define MIN_TIME 8000
to 6500 and it seemed to work, but I'm not sure how many false positives I will get in a real-world environment. at 4000 it fired the event like 5 times in a session, but 6500 only once. Do you think I should expect a lot of false positives after changing this value?
--matt
http://www.hellohunter.com
On Thu, Aug 20, 2009 at 4:54 PM, Eric des Courtis <eric.des.courtis@gmail.com (eric.des.courtis@gmail.com)> wrote:
| Quote: | Matt,
As is mod_vmd will not detect tones shorter then 138ms. However I
could get that value down to ~30ms at best by making a few
modifications to the algorithm.
Cheers.
Eric des Courtis
On Thu, Aug 20, 2009 at 7:51 PM, Eric des
Courtis<eric.des.courtis@gmail.com (eric.des.courtis@gmail.com)> wrote:
| Quote: | Matt,
For your information the tones you gave me are exactly 738Hz. If you
want to try that tone detection thing.
Cheers.
Eric des Courtis
On Thu, Aug 20, 2009 at 2:20 PM, Michael Collins<msc@freeswitch.org (msc@freeswitch.org)> wrote:
| Quote: |
On Thu, Aug 20, 2009 at 11:06 AM, Steve Underwood <steveu@coppice.org (steveu@coppice.org)>
wrote:
| Quote: |
On 08/20/2009 05:22 AM, Michael Collins wrote:
| Quote: |
There is no noise on those 3 beeps. In fact, for something that's
been
through ulaw/alaw compression those beeps are very clean. They are
quite
short, though.
Heck yeah they're short! Steve, in your experience is there a
practical way to detect a beep that short without chewing up system
resources or having lots of false positives?
-MC
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The tone samples I just looked at are about 130ms long. The problem is
the detector is trying to be a very open ended detector of anything
narrowband enough to be a single tone, and of any duration beyond some
small minimum. Its difficult to make such a thing voice immune unless
you can also count on a very large signal to noise ratio. With a digital
trunk you can probably rely on a large SNR, but what happens when people
use analogue lines? There is a reason why DTMF detectors try hard to
work down to about 10dB SNR. 
Steve
|
Thanks for the lesson uncle Steve! I'm guessing that the OP will need a new
strategy. Possibly waiting for silence? Not sure what's the best way to go
but I'm interested in hearing if someone has a solution.
-MC
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piotrek.gregor at gmai...
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| Posted: Tue Mar 15, 2016 8:14 pm Post subject: [Freeswitch-users] Better results from mod_vmd |
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Hi Abaci,
what issues do you mean by "same issue"?
Is this amount of false positives?
Could you describe the tests you perform in more details please?
The avmd module is being revised by myself at this moment
and there is at least one bug in this module that influence the results
FS-8855 fix calc of variance of tone's freq estimator
and it has been fixed now in pull request #714 and will be merged soon
after I do some more testing and rebase, to the end of this week.
Apart from this, there are improvements coming, e.g.
FS-8875 Enable faster beep detection
cheers,
Piotr |
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abaci64 at gmail.com
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| Posted: Wed Mar 16, 2016 8:30 am Post subject: [Freeswitch-users] Better results from mod_vmd |
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My problem was simple it doesn't detect voicemail beeps of wireless carriers voicemail (e.g. Verizon Wireless) the only beep it detected without issue was a beep from another FreeSWITCH Voicemail
On Tue, Mar 15, 2016 at 9:13 PM, Piotr Gregor <piotrek.gregor@gmail.com (piotrek.gregor@gmail.com)> wrote:
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