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E-mail: contactus@audfly.com
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Directional audio technology has gradually entered all aspects of life. For example, at intersections waiting for traffic lights, there are directional audio safety prompts, which can be directed to pedestrians waiting for traffic lights. Safety prompts do not produce noise effects, creating a good life for citizens. surroundings. How is the working principle of directional speakers different from ordinary speakers?
The audible sound wave emitted by most of our common speakers is a common mechanical wave. Its propagation in the air is spherical, divergent, easy to attenuate, and affects the propagation effect. The audible sound wave is radiated 360 degrees. 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 characteristics determine that the audible sound wave will spread in all directions, easily disturbing others;
the highly directional speaker uses the ultrasonic wave as a carrier signal, and then modulates the audio signal into a high-frequency signal to achieve directional transmission in the air, and finally realizes in the air. Self-demodulation enables the human ear to hear the restored audio signal.
In the 1960s, Westervelt, Berktay and others discovered the self-demodulation effect of nonlinear propagation of ultrasonic waves in the air. In the 1980s, Japanese Kamkura T and others successfully developed and produced a directional loudspeaker device. The experiment proved the effectiveness of directional audio technology. The principle is correct.
The key advantage of directional audio technology lies in its ability to control where sound is heard. By projecting audio as a narrow beam, it ensures privacy, reduces noise pollution, and allows multiple different messages to be broadcast in close proximity without interference. This makes it especially valuable in environments where quietness is important or where targeted communication is needed.
However, the technology is not without challenges. Directional loudspeakers typically have higher production costs, require precise installation angles, and their range is affected by air conditions. Furthermore, the perceived audio quality may differ from that of high-fidelity conventional speakers, especially in environments with significant air turbulence. Nevertheless, ongoing improvements in transducer design and digital signal processing are steadily overcoming these limitations.
At present, the directional audio technology series is widely praised by users in practical applications. Audfly directed sound technology also provides a variety of acoustic customization solutions, bringing different changes to more enterprises due to directional audio technology. The application scenarios of the directional audio speaker are very wide and can be applied to all walks of life:
Museums and exhibition halls – Delivering exhibit-specific narration without disturbing other visitors.
Retail stores and supermarkets – Targeting promotional messages to shoppers in a specific aisle.
Public transport hubs – Broadcasting announcements to passengers at a specific gate without creating noise across the entire terminal.
Libraries and study spaces – Providing audio instructions or multimedia content without disrupting a quiet environment.
Outdoor public areas – Giving localized safety instructions, such as at pedestrian crossings or construction sites.
Residential communities and parks – Offering targeted alerts, music, or information to residents in certain zones.
For example, in airports, directional speakers can inform only those passengers queuing at a specific counter about boarding changes, while nearby travelers remain undisturbed. In retail, customers browsing a particular product section can hear an audio advertisement relevant to those items without affecting the rest of the store. This level of audio precision is impossible with conventional speakers.
Looking ahead, directional audio is expected to integrate with AI and IoT systems to enable even more personalized sound experiences. Imagine walking into a store where sensors detect your preferences and beam relevant information directly to you, or an interactive museum guide that follows your position and speaks only when you approach an exhibit. Emerging applications in automotive design, augmented reality, and immersive entertainment will also benefit from this technology.
Furthermore, miniaturization of ultrasonic transducers may soon allow directional audio to be embedded into everyday devices, such as smartphones, kiosks, or digital signage. The potential for sound zoning in open-plan offices or public venues is enormous, allowing multiple independent sound environments to coexist in the same physical space.
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