Before the physicists studied the sound, even before the advent of physics, the ancient Chinese had a good understanding of "acoustics". For example, the "Mojing" in the Warring States period recorded how to apply the "resonance principle" to defending the city. Fortifications. From the idiom "there are ears in the wall", it can be inferred that the ancients also understand that sound waves must spread everywhere. However, for various reasons, human beings have been eager to control the direction of sound waves. Therefore, in fantasy literature such as martial arts novels, there is naturally a mysterious imagination of "passing into the secret." In the real world, it is extremely difficult to make the direction of the sound. Even at the end of the twentieth century, "Science Changming", acoustic technology is still committed to the improvement of sound quality. As for the direction of sound, it is always the subject of "Arabian Nights". Nowadays, into the new century, the relevant theories and technologies have matured one by one, and the research on "directional sound" has finally become a prominent school. "Transmission into the secret" has finally waited until the dream comes true. What is directional sound technology? Ultrasound-based audio directional propagation technology Ultrasound-based audio directional propagation technology is a new sound source technology that allows sound to propagate in a certain direction. The basic principle is to modulate the audible sound signal onto the ultrasonic carrier signal, and The ultrasonic transducer is emitted into the air. During the propagation of ultrasonic waves of different frequencies in the air, due to the nonlinear acoustic effect of the air, these signals interact and self-demodulate, and the frequency is the sum of the original ultrasonic frequencies. New sound waves (and frequency) and frequency difference (difference frequency). If the ultrasonic wave is selected properly, the difference frequency sound wave can fall in the audible sound area. In this way, the process of directional transmission of sound is achieved by the high directivity of the ultrasonic wave itself. Directional sound technology has been very mature in foreign countries (USA, UK, France, etc.). With the improvement of people's environmental awareness, it has been widely used in life and industrial production. However, in China, it was still in a blank until 2015, until the emergence of Juyinbao... The example of concentrating sound technology is currently in the media (LCD/LED advertising), the exhibition hall of the Expo Pavilion, and other cultural and cultural projects, large-scale exhibitions, shopping malls, supermarkets, hotels, public transportation and other dozens of industries. Examples of some of the following scenarios: Media LED/LCD advertising, digital signage: completely break the history of silent advertising, Juyinbao allows advertisers to convey the most beautiful voice to the target users, greatly improving the efficiency of advertising and the visibility of advertisers. Culture Cobo: Installed the museum exhibition hall of Juyinbao. Whenever you stand in front of Mona Lisa, there is a voice that tells you: Under what circumstances Da Vinci captured the mystery smile... not only can it be quiet The key to accepting the art of edification is that you no longer have to use Baidu anymore. Traffic lights: Juyinbao integrated system can automatically capture the red light in real time, and send an audio reminder: do civilized people, refuse to red light. Shopping mall super: Imagine the summer sun, you sweated and walked to an aisle, suddenly came in the ear, "Thirsty, come in and drink a glass of water" looked up and found a convenience store in front of the right... Or, you are visiting the fruit area of ​​the supermarket. When you enter a certain area, there is a sound outside the sky. "The banana you see is a fair trade banana. You know that you should buy this bunch of bananas... ...the key is that this kind of voice can only be heard by one person, and everyone else is shopping like no one else... Car: With the exclusive personalized sound system of Juyinbao, drivers and passengers can enjoy independent audio space without disturbing each other. Through this personalized and exclusive sound experience, the driver's seat and passengers' driving experience during driving is greatly improved. And entertainment life, enriching the user's car experience. There are also hospitals, gyms, cinemas, banks, hotels, smart homes, schools, smart transportation, blind aids... Watch the world, listen to more application scenarios, please pay attention Others Washing Machine Motor,Drain Motor Washing Machine,Washing Machine Dryer Motor,Inverter Motor Washing Machine WUJIANG JINLONG ELECTRIC APPLIANCE CO., LTD , https://www.jinlongmotor.com
Directional sound, as the name implies, means that the sound no longer spreads 360 degrees like a traditional speaker, but has a direction that transmits sound along a certain path.
There are three main types of directional sound technology:
(1) The sound-absorbing cover technology, the simplest of which is to cover a large hemispherical cover on the high-frequency speaker, and the sound can be clearly heard under the sound-absorbing cover;
(2) It is a speaker array technology, which uses a large number of high-frequency horns to form an array to form a beam, and the beam direction is the highest energy in the direction of the main lobe;
(3) It is an audio-based directional propagation technology based on ultrasound. This method is to modulate the sound to the ultrasonic transmission. After hitting the interface, it uses the self-demodulation in the air to generate sound. This technique is reliable and effective. The third technology to achieve directional sound largely fills the gap in the field of acoustic innovation at home and abroad. Below we will explain in detail this major acoustic technology revolution. 
Square dance: First of all, Chinese aunts who love square dance. With the sound-sounding artifact, the aunts can finally sing and dance without worrying about disturbing the people. 
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