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 _______________________________________________ FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org
