[Freeswitch-users] Better results from mod_vmd

Wed Aug 19 10:26:19 PDT 2009

my bet is if mod_vmd is not getting them that they are not going to  
work with tone detect either.  Someone needs to look at the tone and  
see what frequencies are really involved and if they change throughout  
the beep.

Mike

On Aug 19, 2009, at 12:41 PM, Michael Collins wrote:

>
>
> On Wed, Aug 19, 2009 at 1:43 AM, Matthew Fong <mattdfong at 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 at 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 at 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 at 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 at benbria.ca.
> >>
> >> Cheers.
> >>
> >> Eric des Courtis
> >>
> >> On Mon, Aug 17, 2009 at 12:26 AM, Matthew  
> Fong<mattdfong at 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
> >> > _______________________________________________
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> >> >
> >
> >
>
>
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