Researchers at Penn State have developed a groundbreaking technology known as "audible enclaves," allowing individuals to hear specific sounds in a public space without headphones. Using ultrasound waves that bypass human hearing and acoustic metasurfaces to bend sound, the technology can target particular listeners, potentially transforming personal audio experiences in crowded places. This innovation signifies a major advancement in sound manipulation, providing individuals with private listening experiences while maintaining silence in their surroundings.
"We essentially created a virtual headset," said lead author Jiaxin Zhong, an acoustics researcher at Penn State. "Someone within an audible enclave can hear something meant only for them - enabling sound and quiet zones."
The researchers use two beams of ultrasound waves - the type used in medical imaging - which vibrate at a frequency way above human hearing as a 'carrier for audible sound.' That way as they travel, they're silent to human ears and only become audible when they reach their target.
To sidestep the issue of sound spreading and diffracting, the researchers employed 'acoustic metasurfaces' which can precisely manipulate the paths of sound waves, bending them around obstacles.
The technology allows for the creation of 'audible enclaves,' which can target sound at specific locations in crowded environments, providing personalized audio experiences without disturbing others.
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