A
NY Times article I read the other day talks about how teenagers are using super high-pitched ring tones to use their cell phones to text message during classes. Most people lose their ability to hear such high frequencies with age, making this the perfect cheat-the-teacher tactic du jour.
Here's a clip of the sound courtesy of npr:
squeal meI
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I had another version of this played for me in a room of 2500 people at our conference (some sort of speech illustration), and I couldn't hear jack.
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Televisions also make a sound like this, if you mute the volume.
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