One‑Person Speaker Beams Sound Just for You

Wearing headphones all day can make your ears feel hot, sweaty, or itchy. Most people just accept that noise for work or study. But what if you could hear your music or a podcast all by yourself? That way nobody else in the room has to listen.

Researchers at Pohang University of Science and Technology built a new speaker called MiPAL. It sends sound with ultrasound so only one person can hear it. The device uses a single tiny speaker instead of many tiny ones. That makes the hardware super simple.

The system works by firing ultrasonic waves that turn into audible sound only at a narrow spot. A special front panel acts like a lens, shaping the beam. Behind it, flexible panels stop extra vibrations from leaking out. Unlike other directional speakers that need dozens of emitters, this one uses just one transducer. It can play speech and music from 500 Hz up to 10 kHz.

Imagine a plane seat where you listen to a movie while the neighbor hears nothing. A desk worker could get a private soundtrack without disturbing coworkers. Museums could give visitors audio only at a display. The prototype is not yet as loud as a normal speaker, so it can't replace headphones today. But if it gets louder, it could change how we listen in many places.