Hypersonic Speakers

http://www.atcsd.com/tl_hss.html

Saw this on a kiddies program yesterday morning and was blown away.

i saw something like this on tommorows world years ago but thought it was a pipe dream. The program on CBBc demonstrated the speaker by directing it towards people some 100meters away. you could seee them walking along then all of a sudden jumping and loking everywhere for the soruce of this sound...

audio spotlights .................................................. .........great stuff

have a read of the white paper associated with it - a genuinly good read. the intro is a classic.