[Freeswitch-users] Better results from mod_vmd

[Steve Underwood]

On 08/18/2009 05:15 AM, Eric des Courtis 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.
>    
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.

Steve