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Old 18th October 2017, 06:43 PM   #149
Optical Allusion
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Join Date: Apr 2005
Posts: 759
Originally Posted by dann View Post
Yes, please focus! And let us know if it encourages us to commit ritual satanic abuse if you play it backwards!

OK, I did exactly that, to focus, in focusing on a shorter, more accurately representative sample of 2.31 seconds of duration:

Then in magnifying the "size" [Taille] of the frequency spectrum from 1024 to 65536 [changing Audacity's language from French to English on the fly had a funny effect, which disappeared after a restart], which gave the following spectrum [screencapped]:

Lots of well defined peaks and harmonics in what appeared as an undifferentiated mound at low "sizes". Both 40Hz and 50Hz AC peaks and their harmonics (until ~240Hz) are present. And also 15, 17, 25, and 30Hz peaks (all those 2Hz).

The mound morphed into a fancy fractal.
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