posted on Mar, 21 2016 @ 09:38 PM
a reply to: eNumbra
So I ran the "isolated segment from recording 3" through some audio enhancement tools and was able to cut out everything except the continuos tone. I
can upload the file if someone helps guide me through the process of uploading an audio clip! I found the main frequency to be oscillating at 240 Hz.
I'm going to get a little nerdy now. American standard electric hums (known as Main Hums) fall at around 60 Hz (frequency). Now as you may know,
sounds/tones of all sorts are simply created by vibrations in the air. Now considering the Main hums at around 60 Hz, I believe what you are hearing
is simply the audible vibrations caused by altering magnetic fields within a nearby transformer, at 3 times the Mains frequency. Check these out.
Your tone- 240 Hz / 2 = 120
120 / 2 = 60
60 Hz = Mains Hum
Why 240? Well I believe that it's simply a 3 X harmonic of the standard 60 Hz. However when running the audio through the analyzer, I did not find any
audible tones oscillating at 60 nor 120 Hz. Usually, you'd be able to hear the lower harmonics and see them through the analyzer (in our case 60 Hz
and 120 Hz). Maybe someone can shed some more light on it, but that's what I got for now!
edit on 21-3-2016 by kngfc because: I'm bad at spelling