I've tried recreating the drone I experience (hear), unheard by others I've asked. The audio is not perfect in tone, but the pulsating (high/low, short/long) is very similar. I chase the sound whenever I'm tuned into it (mostly within my own home's walls, 2nd most outside my home), trying to find the source, but to no avail. I do not recall hearing it in other buildings, or outside them. Might be because I'm distracted by other goings on.
I hear it louder & clearer when I'm in esp. small, enclosed areas (i.e. closets). As said before by others before me in this thread, turning the electricity off does not take it away. I plug my ears, and still hear it. Leads me to believe its source is in my brain. And of course, since it appears to be inside my head, I can't actually record it (like trying to catch a ghost on video)... hopefully the audio file will give everyone who listens an idea of my experience. As everyone else has, I run through a list of possibilities.
If trying to explain it, I liken it to the sound of a distant train traveling over railroad tracks, or 18 wheelers passing over a major thoroughfare (also, at a distance). Only reason I've ruled this out is because others can't hear it as/when I do (living both near railroad tracks and a major freeway).
I've often wondered if it originates from within our plumbing, air condition/heating, electricity, smart meter, or something else structural. Then - wifi - which we use sparingly.
Sometimes, I wonder if I've damaged my hearing by using earbuds so much; or by being exposed to other something(s) that has(have) damaged/affected my brain... i.e. dental care, chiropractic adjustments to my neck, x-rays, drag races etc. Speaking of dental care - not too long ago I read an article that discussed a new dental procedure (in development) where they are testing adding hearing aids to teeth implants --- they have found(?) the implants act as good receivers.
I've considered every aspect of my life, barring few, if not none - work history, health history, vaccine history, dental history, exposures to
industrial equipment/noises, cell towers, airports, water sources... as much as I can recall on each. From that, I go to earth changes, to include the so-called 'planet x' and its elliptical orbit, along with the suggested impacts on humankind by its imminent incoming visit.
Thoughts sometimes take me to mind control... even the possibility/probability of being chipped - to include being chipped by a common big-name company I use to work for; by food, water, air; by V@X; et al. >>>>
I've also read/listened to the work of Sharry Edwards, who explained her 'talent' thusly: "It has been known for many decades that I could hear and duplicate sounds that others do not perceive. This has been verified by military authorities and prestigious institutions.
The testing established that my ears were mutated and that I was hearing sounds from the ear called OtoAcoustic emissions (OAE). Many novel and futurist changes have come from this odd talent." She studies and deals in frequencies, and contends it is a 'new' mode of healing through frequencies. A link to her site if you are interested:
Home Page - Sound Health
I once looked into OAE (still have the Wiki and other sites, bookmarked):
en.wikipedia.org
The primary purpose of otoacoustic emission (OAE) tests is to determine cochlear status, specifically hair cell function. This information can be used to (1) screen hearing (particularly in neonates, infants, or individuals with developmental disabilities), (2) partially estimate hearing...
emedicine.medscape.com
While extremely low-level sounds do not stand out as much to our ears, they can influence noise-sensitive equipment significantly.
www.acentech.com
BTW, I tried matching my 'hum' by literally humming, in an effort to determine the actual note/key. I stood at the piano, hitting keys to find the one(s) closest. If I were to have a key between middle C and C#, I'd have what I consider closest to the tone of my 'hum.' If that key were to stick, causing the string to vibrate for an indeterminable time, I'd have the sound replicated almost exactly. (I know this because an octave lower, the C# DOES stick, giving me the lengthy and fading vibration - the lengthy vibration also has an airy sound, much like the 'hum' in my head.) This might sound stupid/silly (as much, if not all, of my reply does), but I actually thought the sound might be from something affecting my piano strings... written off, because the piano is in a room that is not central to the house.
Okay, I've gone on much too long. I'll go finish reading the rest of this long thread to see what others have had to say.