Matt, You must first capture the audio beeps and verify that they are sine waves. If not, simply tweaking the algorithm will not give you better results.
It might be possible to use FFT and I would be happy to help you implement such a solution but keep in mind FFT is very very demanding on the hardware. Ideally what you want to find out is what functions was use to generate the beep in the first place so that it can be detected. Is it two sines waves like in DTMF? Or something more complex? Anyway my email is [email protected]. Cheers. Eric des Courtis On Mon, Aug 17, 2009 at 12:26 AM, Matthew Fong<[email protected]> wrote: > I tried emailed Eric, seeking advice on this, but his email (the one in the > source code) is bouncing email (invalid user), so thought I would ask here > instead. If anyone has eric's new email address, I'd be interesting in it. > > I did some tests with mod_vmd this afternoon, but I'm only finding about 33% > of the voice mail beeps and did have 1 false-positive in my test of 7 voice > mail machines. I've recorded the audio of the session in .wav files that > were both successful and not, as a comparison. I can upload the .wav files > if they would be useful. > mod_vmd works great for voicemails of Skype Users, and kall8.com, but has > issues dealing with mobile phone carriers. > sprint - not successful > tmobile - not successful > verizon - not successful > panasonic home answering machine system - not successful > kall8 - SUCCESS > skype - SUCCESS > I'm wondering if you can recommend a simple fix, like changing some of the > constants like MAX_FREQ, or MIN_TIME at the top of the mod_vmd.c source > file, or if better success requires more complex analysis. Do you have any > recommendations on how this might be done? Listening to the .wav's > its apparent the beeps are not as loud for the mobile phone carriers as they > are with skype and kall8. Any guidance would be greatly appreciated. > --matt > hello hunter > http://www.hellohunter.com > voice broadcasting & hosted dialer > _______________________________________________ > 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
