How to eavesdrop on alien chat

http://space.newscientist.com/article/mg20026804.400-how-to-eavesdrop-on-alien-chat.html?DCMP=ILC-hmts&nsref=top1_head_How to eavesdrop on alien chat

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

SETI Institute

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