Video recording of items will help to eavesdrop on the conversation. Free Technical Library News

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Video recording of objects will help to eavesdrop on the conversation

15.08.2014

Scientists from the Massachusetts Institute of Technology (MIT) have developed a method of eavesdropping on conversations by filming objects located in the vicinity of talking people on video cameras and analyzing the vibration of these objects.

The method works in several stages. First, the frequency and pressure of the sound waves that reach an object (such as a paper cup) are recorded. The camcorder then records the object's vibrations, converting them into pixel movements. After that, a special program converts pixel shifts into sounds.

"We were able to decipher the words of the song at a distance of 4,5 meters from the vibrations of a bag of chips behind a special soundproof glass," says Abe Davis, lead researcher. Then we managed to recognize the song of the group Queen Under Pressure, playing in the headphones, by the vibrations of their cord. Moreover, it was even possible to recreate the original sounds from the video recording of the candy box, which was next to the humming person. The new technology also makes it possible to determine the gender of the speaker. However, it does not yet allow to parse ordinary speech.

The authors of the article rightly note that intelligence already uses laser microphones for listening by reading information from vibrating surfaces. But for successful work, they need to eavesdrop on conversations behind glass, and transparent and clean. Thanks to the new method, it is possible to "remove" vibrations from almost any object.

As Davis notes, measuring the physical properties of distant objects using new technology is more interesting for him than intelligence activities.

"The response of objects to sound speaks to their unexpected structural properties," the scientist points out.

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