[microsound] VHF in pop

[Justin Glenn Smith]

It could be coincidental or unrelated, but some shopkeepers broadcast VHF tones designed to be inaudible to adults but irritating to teenagers, to keep kids from loitering. I also heard of kids appropriating the tone as a way of being alerted to text messages in class in a way inaudible to their teachers.
http://www.noloitering.ca/

macdara at email.com wrote:
> Does anyone know of a particular reason why very high frequencies (on edge of my hearing anyway) would be used in commercial pop music, there were these sounds being used rhythmically in a shopping centre the other day and I'm wondering are there specific psychoacoustic reasons because it seemed like they were very deliberately being blasted.
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