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> wrote:
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> wrote:
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> wrote:
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> wrote:
On Thu, Aug 20, 2009 at 11:06 AM, Steve Underwood <steveu@coppice.org> wrote:
On 08/20/2009 05:22 AM, Michael Collins wrote:
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
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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