The laser gun that can transmit sound directly into the ear of someone in a noisy room

The researchers revealed a radical laser gun capable of transmitting sound directly into the ear of a person through a room.

Researchers at the Lincoln Laboratory of the Mbadachusetts Institute of Technology were able to convey various tones, music and speeches recorded in a conversational volume.

They say that their breakthrough could have a dramatic effect on everything from warfare to sending messages to troops to listening in a noisy room.

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The MIT team said their breakthrough could have dramatic effects on everything from war to hearing in a noisy room.

"Our system can be used by far to transmit information directly to the ear," said the head of the research team, Charles M. Wynn.

"This is the first system that uses totally safe lasers for the eyes and skin to locate a sound signal to a specific person, in any environment."

The system uses a technique called photoacoustic effect, which occurs when a material forms sound waves after absorbing light.

For their project, researchers used water vapor in the air to absorb light and create sounds.

"It can work even in relatively dry conditions, because there is almost always a little water in the air, especially around people," Wynn said.

"We found that we did not need a lot of water if we used a laser wavelength very strongly absorbed by water.

"This was essential because the stronger absorption leads to more of her."

In a document revealing the project, they write that it could be used everywhere, from home to large outdoor spaces.

"Communication between noisy rooms, hail and warning applications, and localized communication intended only for the intended recipient are some possibilities.

One of the new methods of sound transmission comes from a technique called dynamic photoacoustic spectroscopy (DPAS), which researchers have previously developed for chemical detection.

Researchers are changing the length of laser scans to encode different frequencies, or audible sounds, in light.

A unique aspect of this laser scanning technique is that the signal can only be heard at a distance from the transmitter.

This means that a message could be sent to a person rather than to everyone pbading through the beam of light.

It also opens the possibility of targeting a message to several people.

In the laboratory, researchers have shown that a commercially available equipment could transmit sound to a person at a distance of more than 2.5 meters to 60 decibels using the laser scanning technique.

They believe the system could easily be extended to longer distances.

They also tested a traditional photoacoustic method that does not require laser scanning and encodes the audio message by modulating the power of the laser beam.

Researchers then plan to demonstrate outdoor methods at longer distances.

"We hope this will eventually become a commercial technology," said Sullenberger.

"There are many exciting possibilities and we want to develop communication technologies in a useful way."