Friend says he knows someone with a radio that can't be recorded. Says it sounds like a p.a. system, only you can't pinpoint the emitters' location, it's not quite loud enough to be recorded, and they can blend the audio into surrounding noise to make people think they're crazy. They like to set the thing up to a series of speakers and watch people wander around looking for the source. Nice people huh? Is this possible? I didn't hang around long enough to find out the hard way.
2006-09-25 12:57:53 · 2 answers · asked by goddesscrowmaiden 1 in Science & Mathematics ➔ Engineering
I wonder if this is what you heard about. It's a fascinating invention for beaming sound to specific targets over long distances that is inaudible outside the target. An ultrasonic speaker emits an inaudible (to humans) signal that gets converted to audible sound as it reaches the target listener. It would be difficult to record unless you placed the microphone in the beam because the transmitted energy is ultrasonic and people on either side would not hear it. It is also possible to effectively mask the source. I've attached a couple of references.
2006-09-25 17:56:35 · answer #1 · answered by ChicagoDude 3 · 0⤊ 0⤋
Looks like "Tlocity" is not listening....?
Maybe this article can explain what you mean:
http://www.publicknowledge.org/node/306
Read somewhere in the center of that page under "PERFORM ACT"
2006-10-03 10:44:26 · answer #2 · answered by Marianna 6 · 0⤊ 0⤋