New Audio Technology Targets Sound to Individuals Without Disturbance
Researchers at the Pohang University of Science and Technology in South Korea have successfully developed an innovative speaker technology that utilizes ultrasonic waves to direct audio content to a specific listener. This advancement ensures that individuals in a designated area can hear content without affecting or disturbing those nearby.
The device’s design features two specialized material layers. The first layer functions as a precision lens, focusing sound waves in a specific direction. The second layer acts as a vibration suppressor, effectively minimizing sound leakage to the sides and ensuring the audio remains restricted to the target range.
Technically, the system operates using high-frequency ultrasonic waves that exceed the range of human hearing. These waves serve as carriers for audio information—such as speech or music—traveling through space before converting into audible, clear sound only upon reaching the designated listener’s location.
The research team conducted practical tests of the system in an environment designed to simulate aircraft cabins. The results demonstrated that the device could successfully deliver clear audio to a specific passenger without causing any disturbance to travelers in adjacent seats. Furthermore, the system offers high flexibility, allowing it to be adapted to various seating arrangements and spatial layouts.
From a manufacturing perspective, the innovation is notable for its simple design. Components of the device can be produced using 3D printing technology, which enhances the potential for large-scale commercial and industrial application. These potential use cases include improving the passenger experience on aircraft, as well as developing display systems for museums and exhibitions where there is a need to direct audio information to specific individuals without creating general noise.
This technology represents a significant step forward in modern acoustics. It paves the way for solutions that offer greater privacy and comfort in public and shared spaces, reflecting the substantial potential of scientific advancements to improve listening environments and provide enhanced privacy for users in crowded settings.
