Sound directly in the ear / day
They have discovered a way to create localized « sound pockets » that are completely isolated from the surrounding sound waves. The innovative method is to bring these hearing « sachets » directly to the earlier of the chosen recipient. As a result, the recipient will hear the music or verbal messages transmitted to him, while everyone around him will only be environmental noise.
The innovation is based on self -confident ultrasound rays and the concept of non -linear acoustics. Ultrasonic waves, whose frequencies exceed the human hearing range, move through the air as usual sound waves, but people do not hear them. Because ultrasound can penetrate through many materials and interact with objects in a unique way, it is widely used in medical imaging and industry. Given these properties, American specialists used ultrasound as a signal carrier. Typically, sound waves connect linear, with many small proportionate waves, but this time, nonlinear interactions were used, resulting in new frequencies. Namely, scientists operated the phenomenon that two of each unheard of ultrasound waves become audible when their paths intersect. However, this only happens in a small area of the room, creating the sound pocket already mentioned. If such a pocket occurs at the human ear, he can hear the sound of ultrasonic waves. Since it is necessary to drive waves to a specific place for this purpose, the authors of the work developed circles of ultrasound waves that are precisely controlled, the portal said on the portal The Conversation.
