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- cross-posted to:
- [email protected]
Imagine three people huddled in a circle so when one speaks, only one other hears. Scientists have created a device that works like that, ensuring sound waves ripple in one direction only.
The device, developed by scientists at ETH Zurich and the Swiss Federal Institute of Technology Lausanne, is made up of a disk-shaped cavity with three equally-spaced ports that can each send or receive sound.
In an inactive state, sound transmitted from port 1 is audible to ports 2 and 3 at equal volumes. Sound waves bounce back to port 1 as an echo as well.
When the system is running, however, only port 2 hears port 1’s sounds.
The trick is to blow swirling air into the cavity at a specific speed and intensity, which allows the sound waves to synchronize in a repeating pattern. That not only guides the sound waves in a single direction, but gives more energy to those oscillations so they don’t dissipate. It’s kind of like a roundabout for sound.
The scientists say their technique may inform the design of future communications technologies. New metamaterials could be made to manipulate not just sound waves but potentially electromagnetic waves too.
Please incorporate this technology into TVs so I don’t have to hear them through the wall.
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This will be cool to make coworkers life hell, pushing sounds that only they can hear then call them crazy for imagining things.
I’m an horrible person.
Someone needs to connect these scientists with this mom.
It is absorbed by the mind of the listener, and stored for later use in the memory. As old memories fade away, you could also say that eventually it gets destroyed in the memory.
What community was that from?
Ah, like the Cone of Silence from “Get Smart!”
What?!
You heard me. Squeeze. The. Lemon.
Chief, I hit you in the head with a fire extinguisher.
Missed me by that much!
Hope they cited prior work by Horan N., Payne L., Styles H., Tomlinson L. and Malik Z.
Lily Tomlinson had me thinking Magic School Bus but Zayne Malik being in One Direction makes a lot more sense.
Set SASERs to Stun
“Sound Amplification by the Stimulated Emission of Radiation”
Heh, at first, I was mentally comparing it to the LRAD but those still have a lot of rear and side leakage and aren’t truly unidirectional. They also work on completely different principles.
But since every technology is eventually weaponized, I fully expect to see SASERs if/when this makes it out of the lab lol.
Circulators have already existed for quite while for electromagnetic waves. Maybe some of the ideas here can be used to improve them though?
I thought we already had devices that sent sound to one particular space such that one person would hear it but not someone a bit away.
There’s the LRAD (Long Range Acoustic Device). It’s directional, but there’s side/rear leakage. This seems to be fully directional and works via a different method. Or, at least, that’s my understanding.
The LRAD is a loudspeaker. This technology is more like rf electronics.
