Audible enclaves use two intersecting ultrasonic waves to create localized sound, heard only at specific spots. This technology enables private audio in public spaces, allowing targeted messages in stores, museums, or transport hubs without disturbing others. It enhances personalized communication, immersive experiences, and noise-free announcements in crowded environments.
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Scientists in the United States displayed that two ultrasonic waves of different frequencies are capable of creating a localized, hearable sound when they cross paths.
They are small pockets of sound that remain unaffected by surrounding noise.
They use advanced technology to deliver sound to a specific person without others hearing it, even in a crowded place.
Unlike traditional speakers that emit sound waves in all directions, these systems create focused beams of sound that only certain individuals can hear.
How does it work?
Instead of just using a single high-frequency wave, researchers found that using two high-frequency waves with different frequencies can create an even more localized sound effect.
Individually, these high-frequency waves remain inaudible. However, when they intersect at a particular spot, non-linear interactions between them generate an audible sound wave.
Only people near the intersection point can hear the sound, while those outside the area will remain unaware of it.
It can allow individuals to hear different audio streams in a shared space without needing headphones.
Stores can use it to play personalized messages to customers standing near specific products.
Visitors can receive localized audio explanations without disturbing others.
It can be used for private communication in public places.
It could deliver announcements to specific passengers without disturbing everyone.
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PRACTICE QUESTION Q. Consider the following statements about ultrasound:
Which of the above statements is/are correct? A) 1 and 3 only B) 2 and 4 only C) 1, 3, and 4 only D) 2, 3, and 4 only Answer: B Explanation: Statement 1 is incorrect because ultrasound waves have frequencies above the audible range for humans (typically above 20 kHz). Statement 2 is correct; ultrasound imaging is a common diagnostic tool. Statement 3 is incorrect; higher frequency waves generally have lower penetration power compared to lower frequency waves in many materials due to increased scattering and absorption. Statement 4 is correct; bats emit ultrasound and interpret the returning echoes. |
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