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@franchxni1j: Now we can just brush & whiten our teeth at the same time for how affordable this is,this surprised me ❤️🙌🏻#usmile #whiteningtoothpaste #purpletoothpaste #toothpastetablets #tiktok

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Monday 26 October 2026 11:01:37 GMT
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In a breakthrough that could reshape how we experience sound, researchers at Penn State have developed “audible enclaves,” pockets of sound that exist only at precise points in space. Unlike headphones, which physically isolate audio, this system allows someone in a room to hear a song or a podcast while others nearby hear nothing at all. The technology works by emitting two beams of ultrasound, frequencies too high for human ears to detect. On their own, the beams are silent. But where they intersect, the nonlinear interaction between them generates an audible tone within the normal hearing range. To guide the beams, the team used 3D-printed acoustic metasurfaces, microscopic structures that bend sound waves much like a lens bends light, allowing the audio to curve around obstacles such as human heads. In tests, researchers placed microphones inside a dummy’s ears to mimic human hearing. The results confirmed that sound was only detectable at the intersection point, not along the beams’ paths. This created a “virtual headset,” where a person inside the enclave could listen privately even in a reverberant environment like a classroom or living room. Currently, the system projects sound about a meter away at around 60 decibels, the level of normal conversation. It can reproduce a wide range of frequencies, from 125 Hz to 4 kHz, covering much of the spectrum needed for speech and music. Although still experimental, the work points to future applications from museum tours without headsets to cars where each passenger enjoys personalized audio. By transforming ultrasound into targeted sound bubbles, audible enclaves offer a glimpse of a world where private listening is possible without isolating ourselves from our surroundings. Source: 10.1073/pnas.2408975122
In a breakthrough that could reshape how we experience sound, researchers at Penn State have developed “audible enclaves,” pockets of sound that exist only at precise points in space. Unlike headphones, which physically isolate audio, this system allows someone in a room to hear a song or a podcast while others nearby hear nothing at all. The technology works by emitting two beams of ultrasound, frequencies too high for human ears to detect. On their own, the beams are silent. But where they intersect, the nonlinear interaction between them generates an audible tone within the normal hearing range. To guide the beams, the team used 3D-printed acoustic metasurfaces, microscopic structures that bend sound waves much like a lens bends light, allowing the audio to curve around obstacles such as human heads. In tests, researchers placed microphones inside a dummy’s ears to mimic human hearing. The results confirmed that sound was only detectable at the intersection point, not along the beams’ paths. This created a “virtual headset,” where a person inside the enclave could listen privately even in a reverberant environment like a classroom or living room. Currently, the system projects sound about a meter away at around 60 decibels, the level of normal conversation. It can reproduce a wide range of frequencies, from 125 Hz to 4 kHz, covering much of the spectrum needed for speech and music. Although still experimental, the work points to future applications from museum tours without headsets to cars where each passenger enjoys personalized audio. By transforming ultrasound into targeted sound bubbles, audible enclaves offer a glimpse of a world where private listening is possible without isolating ourselves from our surroundings. Source: 10.1073/pnas.2408975122
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