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<[email protected]> wrote: > > > On Thu, Aug 20, 2009 at 11:06 AM, Steve Underwood <[email protected]> > 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 > > > > _______________________________________________ > FreeSWITCH-users mailing list > [email protected] > http://lists.freeswitch.org/mailman/listinfo/freeswitch-users > UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users > http://www.freeswitch.org > > _______________________________________________ FreeSWITCH-users mailing list [email protected] http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org
