this post was submitted on 12 Oct 2024
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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.