On Wed, Aug 19, 2009 at 1:43 AM, Matthew Fong <mattdfong@gmail.com> wrote:
Hi Eric, Thanks for these recommendations.
for vmd-not-panasonic-home-ans.wav changing MAX_FREQ to 1450 WORKED!
but I'm still having problems picking out the ~750Hz beep of sprint, tmobile, and verizon. I tried first cutting POINTS and VALID in half, then in half again, while also reducing MIN_AMPL in half but still no luck. I assumed from the descriptions of each, that reducing the numbers would make the algorithm less picky at finding a beep. Is this correct?
Any other recommendations on picking up these ~750Hz beeps? Thanks again for the help.
How close are they to 750Hz? If they're not more than say +/- 16Hz then the tone_detect app *should* be able to detect them. At the very least I would try it. See if tone_detect can detect those beeps. While it may not be the most elegant solution, having mod_vmd looking for one set of tones and tone_detect looking for the 750Hz tones might actually get the job done, at least until you and Eric can get together to see what's happening on the 750's. -MC
--matt
On Mon, Aug 17, 2009 at 2:15 PM, Eric des Courtis < eric.des.courtis@gmail.com> wrote:
Matt,
Okay the good news is vmd should be able to handle these cases. The bad news is for whatever reason they are not getting detected at the moment.
vmd-not-panasonic-home-ans.wav is a sine at ~1400Hz you can change MAX_FREQ to 1450 and play with MIN_AMPL if that still doesn't help.
The following seem to use the same beep:
vmd-not-tmobile.wav is a sine at ~750Hz but has a bit of noise vmd-not-sprint.wav is a sine at ~750Hz but has a bit of noise vmd-not-sprint.wav is a sine at ~750Hz but has a bit of noise
You can try to play with these values:
POINTS 32 VALID 22 MAX_CHIRP 22
If that doesn't work let me know I will try to improve the algorithm to detect the providers.
Cheers!
Eric des Courtis
On Mon, Aug 17, 2009 at 1:52 PM, Matthew Fong<mattdfong@gmail.com> wrote:
Hi Eric, Thanks for the response. I had tried emailing you @brenbria.com and the email had bounced, thanks for responding to my mail. If you'd be interested I .zipped up my sample voicemail beeps at http://bandcon.hellohunter.com/vmd_wav.zip I'm relatively new to telephony, but can you point me in the right direction for figuring out if the beeps are sinewaves. About as far as I've come with audio is being able to open the .wav files in audacity. Any website recommendations I can read? Thanks so much. --matt
On Mon, Aug 17, 2009 at 10:29 AM, Eric des Courtis <eric.des.courtis@gmail.com> wrote:
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 eric.des.courtis@benbria.ca.
Cheers.
Eric des Courtis
On Mon, Aug 17, 2009 at 12:26 AM, Matthew Fong<mattdfong@gmail.com>
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 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
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