[Freeswitch-users] Better results from mod_vmd

Andy Spitzer woof at iwoof.org
Wed Aug 19 12:38:57 PDT 2009

On Wed, 19 Aug 2009 14:50:34 -0400, Matthew Fong <mattdfong at gmail.com> wrote:

> I was trying to use audacity, but not sure how to tell the exact  
> frequency.

Audacity can do it.  Highlight the "beep" (and nothing but the beep) with the selection cursor, then click "Analyze->Plot Spectrum..."  In the "Frequency Analysis" window that opens, place the cursor on the center of the largest peak.  Near the base of that window it will show the Cursor and Peak frequencies.  For example, in the "vmd-not-panasonic-home-ans.wav" file, the "beep" is 1400 Hz (for a very short 1 second).  Then later it switches to FAX CED tone (2100 Hz) and FAX preamble.


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