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Sound is a very strange thing. An echo-prone room can be fixed with a single bit of foam in a corner. Noise can be ‘cancelled’ by playing a reversed sound wave back at your ears. And now a new study has found that you can transmit sound across a room, even bending it around obstacles, so it can only be heard by someone standing in a specific spot.
A team of researchers at Penn State College of Engineering have been fine-tuning a technology that allows them to create ‘audible enclaves’ using nonlinear self-bending ultrasonic beams (via Futurism). And if that’s all gobbledygook to you, allow me to explain.
Ultrasound is essentially sound with frequencies greater than 20 kHz, which often exceeds the limit of what can be heard by an average human being. The Penn State team has been using…more
Source www.pcgamer.com
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