Read about kids using ultra high frequency ringtones to defeat the 'No cellphones in class' rule, as older adults are not supposed to be able to hear frequencies above 17 kHz. I could hear this, but maybe I have exceptional ears for my exceptional age.

Comments

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  nuck 6 years, 1 month ago

  Are you sure this is 18500 kHz? I can hear this really, really well, but I can't hear a lot of 17000 kHz samples that I've tried. Also, I doubt that I'd be able to hear this at my age (31).
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  gezortenplotz 7 years ago

  Thanks for the comments. I agree with you guys. I generated it using Cool Edit & didn't really know what I was doing. Plan B is to record my ultrasonic 'rat chaser' box to regain grace with this forum.
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  Fratz 7 years ago

  I second that. I generated a pure 18.5kHz tone on good headphones, and it's a much higher sound. (Side note, I now know my hearing has degraded since high school - my high tone is down to 19.4kHz.) An 18.5kHz ringtone would just cause me to destroy whatever was making it :)
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  acclivity 7 years ago

  This seems to consist of two tones at about 1150 Hz and 5.25 KHz, which are both easy to hear. Cool Edit Pro shows no significant components higher than this. You wouldn't fool your teachers with that ringtone!
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  Fratz 7 years ago

  I can hear it really well. When I was 18, I could hear up to 20kHz easily. I still can hear 20kHz somewhat, at 34.