New Technology Allows You To Listen To Music Without Headphones And Without Disturbing Those Around You

Written by Bruno Teles

Published on 21/03/2025 at 10:14

Nova tecnologia permite ouvir música sem fones de ouvido e sem incomodar ninguém por perto. Sistema usa ultrassom para criar zonas de som invisíveis e privadas

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Created by researchers at Penn State University, the innovation uses ultrasound to create invisible sound enclaves, where sound is audible only to the listener. The technology can transform public spaces, offices, public transport, and the advertising industry.

Listening to music in the subway or watching videos in a café, without headphones and without disturbing those around, seems impossible — but it is no longer. A team from Penn State University in the United States has developed a new technology that precisely directs sound to a single point in space, allowing only the user to hear the audio, even in public places.

The research was published in March 2025 and caught the attention of outlets such as Olhar Digital and the Terra website, which explain that the innovation works through what’s called nonlinear acoustics, creating “silent sound zones” for those outside the range. The sound bends, avoids obstacles, and reaches the listener’s ear with precision, without external noise or interference for others.

How The Technology That Dispenses Headphones Works

The technology uses ultrasound waves that only become audible sound when they reach an exact point in space. This means that only the person at that point hears the music, without needing headphones and without anyone around hearing anything.

The solution is based on ultrasound beams that interact with each other to form an audible enclave — that is, an exact point where sound can be heard. The researchers explained to the journal Applied Physics Letters that, outside of this point, the beams remain at frequencies inaudible to humans.

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Applications: From Offices to Public Transport

Among the practical applications already mapped are subway stations, waiting rooms, shared offices, and even autonomous vehicles. As the sound is only audible to the recipient, it would be possible to listen to a call or video without the need for headphones or speakers. Corporate environments would also benefit from more privacy in calls and less overall noise.

According to the Terra portal, technology and advertising companies have already shown interest in the novelty. The ability to create “sound bubbles” directed at specific consumers could pave the way for new formats of interactive ads in shopping malls, airports, or sports events.

Challenges and Next Steps

The Penn State team acknowledges that there are still challenges. The first is the size of the equipment, which currently occupies a laboratory bench. The next phase of the project involves miniaturizing the ultrasonic emitters and increasing the efficiency of directionality.

Another crucial point is regulation. As the system operates via ultrasound, it will be necessary to follow safety standards and usage in public spaces. The Federal Communications Commission (FCC) is already studying standards for directional sound technologies that could be used commercially.

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New Technology Allows You To Listen To Music Without Headphones And Without Disturbing Those Around You

Created by researchers at Penn State University, the innovation uses ultrasound to create invisible sound enclaves, where sound is audible only to the listener. The technology can transform public spaces, offices, public transport, and the advertising industry.

How The Technology That Dispenses Headphones Works

Applications: From Offices to Public Transport

Challenges and Next Steps

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New Technology Allows You To Listen To Music Without Headphones And Without Disturbing Those Around You

Created by researchers at Penn State University, the innovation uses ultrasound to create invisible sound enclaves, where sound is audible only to the listener. The technology can transform public spaces, offices, public transport, and the advertising industry.

How The Technology That Dispenses Headphones Works

Applications: From Offices to Public Transport

Challenges and Next Steps

Engineers want to carve through Africa with a giant canal to bring water from the world’s second-largest river to a dying lake on the edge of the Sahara Desert that has already lost 90% of its water.

A giant brown band visible from space, approximately 8,850 kilometers long, connected Africa to America in the Atlantic Ocean, and satellites revealed that it is neither land nor pollution, but the largest accumulation of seaweed in the world, which broke records in 2025.

Workers were opening a modern road in Dover when they found, 6 meters below the asphalt, a 3,500-year-old boat made of stitched oak and plant fibers.

Instead of burning or burying old tires, an American city is transforming about 2,000 of them into the street itself, paving its first sections with a quieter and more durable rubber asphalt.

In just one cast, fishermen are surprised to capture 14,096 mullets in Bombinhas and close a historic season with 58,000 fish; scene recorded in the Santa Catarina paradise marks the last day of the 2026 season.

Consumers eat six times more chicken than in the 1960s, global meat supply quadruples in 60 years, and FAO report reveals the invisible cost on the plate: livestock could drive 80% of the increase in agricultural emissions over the next decade.

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