I've been curious about what this sound is since I was a child. I am not quite sure what I am hearing (but I am guessing EFI), but I hear a type of sound when a TV is, and yes, it can be on mute or just displaying a blank screen (more so with the old school CRT tvs, most plasmas, and some LCD TVs), the same with computer monitors (mainly CRT but some LCDs), and even some other electronics.
What is the sound I am hearing? Keep in mind all the devices have to be on for me to hear it.
The funny thing I am actually unable to use certain air fresheners, because they emit the same sound expect in such a high pitch it drives me crazy, it almost feels like it will make my ears bleed when i use these oddball air fresheners (that require AC power)
Anonymous2007-02-14T00:31:34Z
Favorite Answer
electronic hum. Electronic noise exists in all circuits and devices as a result of thermal noise, also referred to as Johnson Noise.
Johnson–Nyquist noise is the noise generated by the thermal agitation of the charge carriers (the electrons) inside an electrical conductor in equilibrium, which happens regardless of any applied voltage.
this is part of the reason that life in the developed nations is driving people crazy. this stuff has been going on now for over a hundred years in america; several generations. there is probably nowhere in usa that you can completely escape this background noise.
Yeah, same hear. Any CRT monitor turned on. It's from the high frequency vibrations emitting from the gun that fires the image onto the screen. Thank god for flat screens and flat panels!
I don't know what causes the sound, but I hear it too, when a t.v. or monitor is first turned on especially. Sometimes I can tell if a neighbor is watching t.v. Annoying, to say the least. Maybe it's the government beaming instructions into our heads? "Must vote Republican..." Or the ad agencies? "Must buy useless crap..." Or Hollywood? "Must watch stupid Adam Sandler movies..." Or your Mom? "Must clean room and do dishes and not have premarital sex with underage transvestite midgets..."