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In the 1960s, Westervelt, Berktay and others discovered the self-demodulation effect of ultrasonic waves propagating nonlinearly in the air. In the 1980s, Japan's Kamkura T and others successfully developed a directional speaker device. Experiments have proved that the principle of directional ultrasound is correct. In 2002, American Joseph continued to promote the practical application of this technology on the basis of them. Until now, it has been applied to various industries in China.
Directional loudspeaker technology has gradually entered all aspects of life and directional sound speaker is increasingly popular in the market. For example, at the intersection waiting for traffic lights, there are directional audio safety prompts, directional pointing to pedestrians waiting for traffic lights, and safety prompts without generating noise, creating a good life for citizens. environment.
The audible sound waves emitted by the vast majority of our common speakers are a common mechanical wave, which propagates in the air as spherical, divergent, easy to attenuate, and affects the propagation effect. The audible sound waves are radiated 360 degrees, in different At different frequencies and angles, the energy of the sound wave will be different, and it is easy to attenuate when it propagates in the air; the 360-degree radiation characteristic determines that the audible sound wave will spread in all directions, and it is easy to disturb the people; the attenuation characteristic determines that the audible sound wave is at a certain distance. No sound can be heard at a distance.
Directional speaker equipment is also called directional speakers, directional speakers, directional speakers, directional speakers, ultrasonic directional speakers, directional speakers, directional playback speakers, directional propagation speakers, etc. The directional speaker is different in that it emits audible ultrasonic waves. Unlike traditional speakers, the loud ultrasonic speaker uses ultrasonic waves as a carrier signal and then modulates the audio signal into a high-frequency signal to achieve directional transmission in the air, and finally in the air. Realizing self-demodulation in the air enables the human ear to hear the restored audio signal.
At present, the series of directional loudspeaker technology has been widely praised by users in the actual application, and has been applied in all walks of life. For example, in the library, in the actual application process, using the super directivity of directional speakers to read Increase audio reading, do not make noise in the same space, and multiple reading methods coexist without interfering with each other, bringing a new audio reading experience.
The application scenarios of directional speakers are very wide and can be applied to all walks of life: exhibition halls, campuses, libraries, museums, supermarkets, parks, residential quarters, railway stations, bus stations, subways, airports, scenic spots and other industries. Due to the characteristics of directional audio, it is a good solution to the pain points caused by the disadvantages of traditional audio in various industries.