Long before physicists began studying sound or the discipline of physics even existed, ancient China already possessed a deep understanding of "acoustics." For instance, the "Mo Jing," from the Warring States period, documented how to apply the "principle of resonance" to fortify city defenses. The idiom "ears through the wall" suggests that the ancients also understood that sound waves travel in all directions. However, driven by curiosity and necessity, humans have long sought ways to control the direction of sound waves. This desire naturally inspired fantastical imaginings in martial arts fiction, including the mysterious concept of "whispering through the void."
In the real world, controlling the direction of sound remains a significant challenge. Even as late as the end of the 20th century, acousticians focused primarily on enhancing sound quality. Controlling sound direction was often relegated to the realm of fantasy. Entering the new millennium, however, advancements in theory and technology have led to the development of directional sound as a distinct field of study. The dream of "whispering through the void" has finally come true.
What exactly is directional sound technology? As the name suggests, directional sound ensures that sound does not radiate in all directions like a conventional speaker. Instead, it propagates along a specific path. There are three primary types of directional sound technology:
1. Sound-absorbing cover technology, where a large hemispherical cover is placed over a high-frequency speaker, allowing sound to be clearly heard beneath the cover.
2. Speaker array technology, which employs arrays of high-frequency horns to form beams, with the main lobe directing the highest energy.
3. Audio-based directional propagation technology utilizing ultrasound. This method modulates sound onto an ultrasonic carrier, transmitting it into the air. Upon interacting with interfaces, the ultrasonic waves self-demodulate, generating audible sound waves through non-linear effects in the air. This third technology has largely filled gaps in acoustic innovation both domestically and internationally.
One of the most promising developments in directional sound technology is ultrasound-based audio directional propagation. This innovative sound source technology enables sound to propagate in a specific direction. The fundamental principle involves modulating audible sound signals onto an ultrasonic carrier, then emitting them via an ultrasonic transducer. During their propagation in the air, ultrasonic waves of varying frequencies interact due to non-linear acoustic effects, self-demodulating and generating new sound waves with frequencies that are either the sum or difference of the original ultrasonic frequencies. If selected correctly, the difference frequency sound waves fall within the audible range. Thus, directional sound transmission is achieved through the inherent high directivity of ultrasonic waves.
This technology has seen significant maturity abroad, particularly in countries like the USA, the UK, and France. As environmental awareness grows, it has found applications in daily life and industrial production. In China, however, the field remained largely unexplored until 2015, when Juyinbao emerged as a pioneer.
Let’s explore some examples of how this technology is being applied today:
Square Dance: Chinese aunties, who love square dancing, can now enjoy their music without disturbing others.
Media Advertising: Traditional silent LCD/LED advertisements are now enriched with sound thanks to Juyinbao, allowing advertisers to reach target audiences more effectively.
Cultural Centers: Museums equipped with Juyinbao systems provide personalized audio guides, such as narrating the story behind Da Vinci's "Mona Lisa."
Traffic Lights: Real-time reminders for pedestrians to follow traffic rules are now integrated into traffic light systems.
Shopping Malls: Personalized audio prompts guide customers directly to products they might need, enhancing shopping experiences.
Automotive: Drivers and passengers can enjoy independent audio spaces, improving both comfort and safety during drives.
Other applications include hospitals, gyms, cinemas, banks, hotels, smart homes, schools, smart transportation, and aids for the visually impaired.
To learn more about the diverse applications of directional sound technology, stay tuned or contact us at:
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