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Old 21st October 2017, 05:01 AM   #159
dann
Penultimate Amazing
 
Join Date: Feb 2004
Posts: 19,539
Originally Posted by Alphaba View Post
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.

I have no idea what that signifies! Most of it seems to be way beyond the range of human hearing, so what would be the point of it? To annoy dolphins or scare away bats?!
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/dann
"Stupidity renders itself invisible by assuming very large proportions. Completely unreasonable claims are irrefutable. Ni-en-leh pointed out that a philosopher might get into trouble by claiming that two times two makes five, but he does not risk much by claiming that two times two makes shoe polish." B. Brecht
"The abolition of religion as the illusory happiness of the people is required for their real happiness. The demand to give up the illusion about its condition is the demand to give up a condition which needs illusions." K. Marx
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