One-way audio transmission device

American engineers invented the first device capable of "sorrowful" eavesdropping by controlling the direction of sound waves so that users could hear without being detected.

Now it is possible to control the movement of sound waves - Photo: epanews.fr)

Prototype equipment is quite complicated, but basically it contains resonant cavity, 3 small computer fans have the effect of air circulation at controlled speed and 3 different ports for recording.

According to University of Texas experts, such arrangements allow them to lead sound from port to gate, despite the fact that sound tends to spread in all directions.

The act of navigating the sound in a particular direction is not easy, according to Gizmag.

The new invention is very useful for countries' intelligence agencies, allowing spies to eavesdrop without fear of being detected, and that is why the project has received support from the Risk Reduction Agency. US defense.

Besides military applications, sound waveguides are more likely to be used in everyday life, such as blocking noisy sounds from neighbors, noise-canceling headphones .