While making some tea I was looking in our sugar jar when I heard a strange digital noise coming from our wall. I tracked it down to a wall outlet that the coffee pot is usually plugged into, I unplugged everything there, and it was still making the noise. I recorded this with my iPod Touch, so the quality may be a little low, but you can clearly hear a pattern. Any idea what could cause this? I checked all the outlets and that is the only one making any sound. 

Isolated the sound here: http://soundcloud.com/mistercurtis/isolated-sound


Strange Sound From Wall Outlet

Isolated sound from the previous upload (http://soundcloud.com/mistercurtis/strange-sound-from-wall-outlet)

MisterCurtis