Two ultrasonic beams create ‘Personal Address’ Audio
Two nonlinear ultrasonic beams can create audible enclaves, where sound can only be perceived at the precise intersection point of two ultrasonic beams
An Penn Sate College report:
Engineers from the Penn State College of Engineering, has precisely narrowed where sound is perceived by creating localized pockets of sound zones, called audible enclaves. In an enclave, a listener can hear sound, while others standing nearby cannot, even if the people are in an enclosed space, like a vehicle, or standing directly in front of the audio source.
In a study published in the Proceedings of the National Academy of Sciences, the researchers explained how emitting two nonlinear ultrasonic beams create audible enclaves, where sound can only be perceived at the precise intersection point of two ultrasonic beams.
“We use two ultrasound transducers paired with an acoustic metasurface, which emit self-bending beams that intersect at a certain point,” said corresponding author Jing. “The person standing at that point can hear sound, while anyone standing nearby would not. This creates a privacy barrier between people for private listening.”
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