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I can also hear some CRT TVs. I have never heard any other type of CRT, though. Are you sure they don't simply emit 20+ kHz sound?

by geon 11y ago

javajosh 11y ago
>Are you sure they don't simply emit 20+ kHz sound? They do. Sorry, didn't mean to imply high metal content in the inner was responsible for both phenomena. Was just trying to give the benefit of the doubt to these people's claims; it sort of bothers me when "science" is quick to dismiss people's claims. I'm sure a lot of people would call me (us) crazy for thinking we can hear such a high pitch - but since it's kind of unimportant trivia, like being able to roll your tongue, it doesn't matter. If hearing the high pitch was the cause of great suffering, being called crazy to think that was the cause would hurt a great deal more, I imagine.
- xorcist 11y ago
  Well, "science" hasn't been very quick to dismiss EM-sensitivity. There has been done many experiments. The subjects usually can't tell if EM equipment has power or not from their symptoms. This does not lessen the problems or make them less real, but it suggests the treatment looks more like treating a thin person convinced he is fat, than like treating allergies, for example. By the way, the ability to hear CRTs is common among young people with good hearing. Many switched PSUs make high pitched noises too, for example. Nosie pollution is quite a problem, and there's been studies that suggests links between noise even slightly in the ultrasound and stress levels.
leni536 11y ago
I think most "electronic noise" is related to coil whine [1]. Although I can imagine that the hsync frequency of cathode ray tubes can cause audible noise. That would explain why you could hear CRT TVs but not CRT monitors. If you take the NTSC standard you can calculate ~15kHz for hsync frequency which is audible. [1] https://en.wikipedia.org/wiki/Coil_noise https://en.wikipedia.org/wiki/Coil_noise
- whoopdedo 11y ago
  Does the TV have speakers? Most do. You can get audible frequencies leaking onto the audio line and emitting noise. My LCD monitor has built in speakers that I never use and have turned "off", but every once in a while I hear a hiss from them.
  - kw71 11y ago
    That is noise inherent in the (low quality) audio amplifier.
  - LnxPrgr3 11y ago
    I doubt it's what's going on with most TVs (especially since LCD TVs don't seem to have this problem), but my old, cheap TV tuner card emits a 15.9kHz squeal on its line out, so it's not impossible.

I can also hear some CRT TVs. I have never heard any other type of CRT, though. Are you sure they don't simply emit 20+ kHz sound?

by geon 11y ago

I can also hear some CRT TVs. I have never heard any other type of CRT, though. Are you sure they don't simply emit 20+ kHz sound?

javajosh 11y ago

>Are you sure they don't simply emit 20+ kHz sound? They do. Sorry, didn't mean to imply high metal content in the inner was responsible for both phenomena. Was just trying to give the benefit of the doubt to these people's claims; it sort of bothers me when "science" is quick to dismiss people's claims. I'm sure a lot of people would call me (us) crazy for thinking we can hear such a high pitch - but since it's kind of unimportant trivia, like being able to roll your tongue, it doesn't matter. If hearing the high pitch was the cause of great suffering, being called crazy to think that was the cause would hurt a great deal more, I imagine.

xorcist 11y ago
Well, "science" hasn't been very quick to dismiss EM-sensitivity. There has been done many experiments. The subjects usually can't tell if EM equipment has power or not from their symptoms. This does not lessen the problems or make them less real, but it suggests the treatment looks more like treating a thin person convinced he is fat, than like treating allergies, for example. By the way, the ability to hear CRTs is common among young people with good hearing. Many switched PSUs make high pitched noises too, for example. Nosie pollution is quite a problem, and there's been studies that suggests links between noise even slightly in the ultrasound and stress levels.

leni536 11y ago

I think most "electronic noise" is related to coil whine [1]. Although I can imagine that the hsync frequency of cathode ray tubes can cause audible noise. That would explain why you could hear CRT TVs but not CRT monitors. If you take the NTSC standard you can calculate ~15kHz for hsync frequency which is audible. [1] https://en.wikipedia.org/wiki/Coil_noise https://en.wikipedia.org/wiki/Coil_noise

whoopdedo 11y ago
Does the TV have speakers? Most do. You can get audible frequencies leaking onto the audio line and emitting noise. My LCD monitor has built in speakers that I never use and have turned "off", but every once in a while I hear a hiss from them.
- kw71 11y ago
  That is noise inherent in the (low quality) audio amplifier.
- LnxPrgr3 11y ago
  I doubt it's what's going on with most TVs (especially since LCD TVs don't seem to have this problem), but my old, cheap TV tuner card emits a 15.9kHz squeal on its line out, so it's not impossible.