But a hackier way would be to build a parametric speaker that focuses soundwaves into a narrow beam like [Shane] did with this ultrasonic sound gun. As the directivity of a soundwave depends on ...

“Metasurfaces are engineered materials that manipulate wave behaviour in ways that natural materials cannot,” said Zhong. “In ...

Researchers have created crazy new headphone-free music tech that can beam sound waves directly into your ears.

A team of researchers at Penn State College of Engineering have been fine-tuning a technology that allows them to create ...

In a nutshell Penn State researchers created “audible enclaves,” localized sound spots that only targeted listeners can hear, using intersecting ultrasonic beams that bend around obstacles like human ...

When the beams intersect, a phenomenon known as difference frequency generation occurs, creating an audible sound. "When two ultrasonic beams of slightly different frequencies, such as 40 kHz and ...