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Guru
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Join Date: Mar 2005
Posts: 3464
Good Answers: 32

A Cell Phone Ring Tone Only Kids Can Hear

06/13/2006 12:00 PM

Are your teenagers tuning into a cell phone ring tone that you can't hear? In places where cell phones are forbidden, crafty kids are avoiding detection by using a ring tone that is inaudible to grownups. Although most human communication takes place in a frequency range between 200 and 8,000 Hz, most adults' ability to hear frequencies higher than that begins to deteriorate in early middle age. Ironically, the popular ring tone is a modified version of an "ultrasonic teenage repellant" that was designed to keep loitering teens away from storefronts. Click here for more information. You can also try to listen to the ring tone.

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The Feature Creep

Join Date: Feb 2005
Location: Boston, MA
Posts: 1055
#1

Hoax

06/13/2006 3:20 PM

This made the rounds not to long ago. While the technology is real, it's called Mosquito, the part about using it as a ring-tone is not true. The problem is that current cellphones can not produce the high pitched tones that make up the audible part of the youth deterrent.

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Anonymous Poster
#2

Far from a Hoax

06/14/2006 8:14 AM

Calling it a hoax without doing some simple research is a very lazy statement. Lots of cell phones these days have speakers built into the side of the case. The quality is far from perfect but they have no problem generating high pitched frequencies. Out of curiosity I recorded a 10KHz to 20KHz sine sweep and played it back through my phone while checking it with a real time analyzer. My phone starts to roll off around 16.5KHz and is barely audible at 18KHz. The problem with the high frequency ring tone is if you are in a large group of people, it is very difficult to distinguish which phone is actually ringing.

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Anonymous Poster
#3
In reply to #2

Re:Far from a Hoax

06/18/2006 6:44 PM

It's not a hoax. I can use it on a phone, and my parents, and others older than around lets say.. 25.. Cant hear it at all.. A phone can do it, it's already been proven. So looks like you need to do research first, because cant just decide a phone can't do that.

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Anonymous Poster
#4
In reply to #3

Re:Far from a Hoax

11/17/2006 7:55 AM

I can hear it just fine and I'm 27.

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Anonymous Poster
#5
In reply to #4

Re:Far from a Hoax

08/05/2007 11:09 PM

I also can hear it and I'm 54!

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Anonymous Poster
#6

Re: A Cell Phone Ring Tone Only Kids Can Hear

12/07/2007 8:03 PM

where can you here te ringtone i heard it from a friend on the bus.

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