High-frequency 'Mosquito' Tone

High-frequency 'mosquito' tone allows students to get around school rules on cell phone use. Students now have a new way to fight authority: the "mosquito" tone.

That is, a high frequency cell phone ring tone that most adults can't hear, but youngsters can.

As people age, many adults lose the ability to hear high frequency noises. That makes the ring tone the perfect way for many students to ignore the rule of turning off their cell phones in class.

"Teachers don't hear them. I've never heard any teacher say anything about it," said Bakersfield High freshman Danielle Yanez. The teen said she hears the phones sounding off in class almost every day.

"It's like a little screeching," South High sophomore Alcide Lovo said of the tone. "Some teachers can't hear them because they're older and their hearing isn't that good."

read more at Bakers Field

[via Bakers Field]
[photo by Felix Adamo]

UPDATE: At ultrasonic-ringtones.com you can listen to such tones and download them as mp3 files. Personally I'm hearing up to 16.7kHz tone so they rated me as 20 y.o. (I'm 24). :)