Good Grief Charlie Brown! Just when you think that there's little left to surprise you, something leaps out and ... well, surprises you, I guess. For example, I just heard about a device called the Mosquito that uses ultrasonics to get rid of unwanted groups of teenagers.
It's actually quite an interesting concept when you come to think about it. First, the motivation for creating this device is that crowds of teenagers hanging around store fronts are the bane of shopkeepers around the world. Thus, the idea behind the Mosquito is that our hearing starts to deteriorate when we turn 20 years of age, with the higher frequencies going first. The result is that its' possible to generate an annoying high-frequency sound that is audible only to teenagers.
In fact, even for those who can just hear this sound, it's not a problem if you are walking into or out of a store. It's only if you hang around for a few minutes that it starts to become annoying. Apparently, field trials have shown that teenagers usually move away from a Mosquito-protected area within just a couple of minutes.
Hmmm, maybe I could get one for use at home ... Questions? Comments? Feel free to email me at firstname.lastname@example.org). And, of course, if you haven't already done so, don't forget to Sign Up for our weekly Programmable Logic DesignLine Newsletter.