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Posted By: Lean | Dec 11th, 2007 @ 11:47 AM
Most human communication takes place in a frequency range between 200 and 8,000 hertz (one cycle per second), most adults' ability to hear frequencies higher than that begins to deteriorate in early middle age thru a process called presbycusis. That was used by a security agency that developed a tone that only teenagers could hear, to keep them out of a shopping mall, where they used to hang out pushing customers out of those stores.
Now the tide had change, somebody created a ring tone, based on that frequency, that only younger people can hear, so when there is no permission to use cellphones (ie in class), they use that ringtone.
Looks like there are some benefits of being a student. Do you want to try if you can hear it? Check how you is your hearing... Here is the link
Funny story, I was getting information about this in a friend's house, he has two little kids, (2 and 5), when I played the ringtone the little one start laughing screaming "Loud! Loud!", and his brother said "turn it off, I'm watching TV and cannot hear". I could bearly hear it Smiley 
What else could be created that only is perceived by students?
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It hurts in my ears... I don't know if I would like something like that as my ring tone. I would run to the phone to get the call as soon as the tone starts!
I've long wondered about this tone. I've read about it but this is the first place that had a link to it so that I could try it out. I was really disappointed that it is so accurate. I was hoping I would be able to "hear younger" but no. Sad
Doesn’t it have to do with the audio system though? I doubt that cheap headphones/speakers or even audio cards/stereos, etc. could produce a good signal. When I listen to the different files on my computer, I find that at some point (uh, frequency) it actually seems to get a little lower in pitch, and starts working it’s way back up. I’m sure that it’s because of my audio player and/or audio card and/or headphones. I can hear/feel something for all but the 22KHz, but they have distinctly different qualities/annoyance levels.