That reminds me of something that was in the news in November 2005.
An ultrasonic teenager repellent:
http://www.compoundsecurity.co.uk/teenage_control_products.html
There were a few cases where shop owners had to take theirs down
because of complaints...
Actually, thats how this was developed. Some smarty pants with a laptop decided that they could turn it around and pull a fast one on the adults. =)
On a side note, I've just discovered you can do the same thing with Audacity ... goto Generate > Tone and put in a frequency. That one is somewhere around 15khz (15000.0 in audacity), while the "Mosquito" (teen repellant) was around 18 I think. Through this method I've determined one of two things
- I can't hear anything over 16khz
- My speakers don't get up to 16khz
_______________________________________________ clug-talk mailing list [email protected] http://clug.ca/mailman/listinfo/clug-talk_clug.ca Mailing List Guidelines (http://clug.ca/ml_guidelines.php) **Please remove these lines when replying
