Knowing the TV is on when it's muted

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i can hear most electronics including CRT TVs. I can even "see" the cycling of 60 cycle florescent tube lights. i can hear vehicles on the main road about a block from my house and with the local buses i can tell the make and model based on the sound. in my younger days in school, i could hear the water fountain from inside a classroom, both the water running and the cooler motor running.

On the few CRT monitors left in our school I get dizzy headed because of A) The sound frequency they emit, especially if they are getting near the end of their life span and B) I see the flicker, its really prominent if I move my head slightly, everything seems to stutter across the screen rather than move smoothly.

I never realised it's weird to hear that... No wonder nobody seemed to know when it's on stand-by or not without looking at the damn light.

Yes, and also the switchmode transformer in most any power supply can whine a frequency. The flybacks are particularly loud (15.75 Khz). I used to be able to hear them from the sidewalk outside of a house where a 1960s model color TV was on (all tubes, and much louder than transistorized TVs of the 1980s & newer). There are some very early model color TV sets from the mod-1950s, which actually play a tune on the flyback as the set warms up, and the frequency climbs up to speed and locks in. It's almost a perfect rendition of the "Tarzan jungle call". I love to listen to that, and unfortunately it's impossible (by any means I know of) to record or reproduce. If you fiddle with the horizontal hold control on those old sets, you can make the flyback create all kinds of cool sounds; warbling and vibrating, and it can go into harmonics.

Charles

Wait...you mean normal people can't hear TVs?

Yes. My father, especially, turns off the cable box, but leaves the tv on. Even though the screen is black, I can tell it's still on, not just by the sound, but I can also see the light coming from it. Odd, I know, and annoying. Same with a stereo or cd player. Even when there's nothing playing, or the volume is down, I can tell it's on.

I don't turn it off unless it's really annoying, though. I leave them on otherwise exactly for that reason. Conserving energy was an interest of mine, but my parents gave me an extremely hard time about it, saying I was obsessive and they would do things like turn on all the lights. So now I'm the one who leaves the lights turned on, after all, as they pointed out, they pay for the electricity, not me. Plus, it helps me point out them leaving everything on wastes as much electricity as the ac at a comfortable temp.

Kids can. The younger you are, the higher your pitch range.

I think NTs with particularly acute hearing do notice TVs, but they simply filter out the irrelevant noise, which is something we have a lot of trouble doing.

Yes I can hear it and I work on TV's and electronics-I could also always smell when something was overheating in a TV-I could always tell when going to peoples houses if their house was heated by oil,gas or electric- and this is the sick one-if they had cockroaches infesting the house

I sure can. It's not a loud noise but the second I walk into a room with a TV on with a black screen or something I can tell it's on.

I had it down one time that I could actually tell you what network channel was on just from the quality of the transmitted sound without seeing a picture.

I think I can, but it's really faint.