Long before physicists began studying sound or the science of acoustics emerged, ancient China had already developed a deep understanding of this phenomenon. One notable example is found in the "Mo Jing" from the Warring States period, which describes how the principles of resonance were applied to fortify city defenses. The idiom "ears in the wall" suggests that the ancients were aware that sound waves could travel anywhere. Despite this knowledge, humanity's desire to control the direction of sound led to imaginative concepts in works like martial arts novels, where the idea of "whispering through walls" became a staple.
In the real world, directing sound proved challenging, even as late as the end of the 20th century. Acoustic technology primarily focused on improving sound quality rather than its directionality. However, with advancements in the new millennium, directional sound technology has evolved into a distinct field of study. What was once considered a fantasy is now becoming a reality.
So, what exactly is directional sound technology? Simply put, it involves transmitting sound in a specific direction rather than spreading it in all directions like conventional speakers. There are three primary methods for achieving this:
1. Sound-absorption cover technology, which involves placing a large hemispherical cover over a high-frequency speaker so that sound can be clearly heard underneath.
2. Speaker array technology, which uses an array of high-frequency horns to form a beam, with the strongest energy concentrated in the main lobe direction.
3. Audio-based directional propagation technology using ultrasound, which modulates sound onto an ultrasonic carrier and then demodulates it in the air to produce audible sound. This approach is particularly reliable and effective.
The third technology has significantly contributed to acoustic innovation both domestically and internationally. Now, let’s delve deeper into the revolutionary technology centered around ultrasound-based directional sound propagation.
Ultrasound-based directional sound propagation technology is a novel sound source technology that allows sound to travel in a specific direction. Its core principle involves modulating audible sound signals onto an ultrasonic carrier signal, which is then emitted into the air via an ultrasonic transducer. As ultrasonic waves of varying frequencies propagate through the air, they interact due to nonlinear acoustic effects, leading to self-demodulation. This interaction generates new sound waves with frequencies that are the sum or difference of the original ultrasonic frequencies. By selecting the appropriate ultrasonic wave, the difference frequency sound wave can fall within the audible range, enabling directional sound transmission.
This technology has matured significantly abroad, particularly in countries like the USA, UK, and France. With growing environmental awareness, it has found applications in daily life and industrial production. In China, however, this field remained largely unexplored until 2015, when Juyinbao introduced groundbreaking solutions.
Let’s explore some practical examples of this technology in action:
1. Square dancing: Chinese aunties, who adore square dancing, can now enjoy their music without disturbing others.
2. Media advertising: Juyinbao’s directional sound systems bring silent LCD/LED advertising to life, ensuring advertisers reach their intended audience more effectively.
3. Museums: At exhibitions like the Mona Lisa, visitors hear informative narration tailored to their location, enhancing the experience without background noise.
4. Traffic lights: Real-time reminders promote civility at intersections.
5. Shopping malls: Personalized audio cues guide customers to products they might need.
6. Cars: Drivers and passengers enjoy independent audio spaces, enhancing comfort and entertainment.
7. Hospitals, gyms, cinemas, banks, hotels, smart homes, schools, and more benefit from this technology.
For more information or customized solutions, contact us at 4001-581-281. The future of sound is here—listen to it unfold!
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