[cryptnoob]

Woody Norris did this 10 years ago using the same technology. I actually have one sitting beside me at my desk that I got back in 2001.

http://en.wikipedia.org/wiki/American_Technology_Corporation

It's fun for practical jokes or making the neighbors think their house is haunted. I'm not sure how this guy is getting credit for this.

[Anechoic]

The Audio Spotlight was introduced around the same time as HSS (~2000-2001 IIRC). The LRAD was introduced earlier, but that uses a different tech (it's just a large two-dimensional array).