Precision Sound Beams Safeguard Pedestrians, Quiet Nights Without Disturbanced | BESTAR Directional Sound Technology Powers Smart Traffic Systems in Multiple Cities

At intersections in Changzhou and on national highways in Yancheng, an innovative acoustic technology is quietly transforming traditional traffic safety warning systems. When pedestrians or vehicles enter a specific area in front of a traffic light, clear voice prompts such as “Pedestrians are prohibited from crossing” or “XX Road green light, please proceed quickly” can be distinctly heard. What makes it remarkable is that these voice prompts are projected only within a targeted, fan-shaped zone. Once outside that zone, the sound rapidly diminishes or even disappears—just like a “spotlight” precisely illuminating sound.

This “sound spotlight” effect is powered by BESTAR’s directional sound technology, delivering a revolutionary auditory experience. Traditional traffic warning systems often rely on high-volume loudspeakers, which have several limitations: their sound spreads in all directions and cannot be focused precisely; in noisy environments, messages are easily drowned out, reducing speech intelligibility; and the sound overflow causes serious disturbance to nearby residents. Field tests show that conventional loudspeakers can reach sound pressure levels exceeding 80 dB at 100 meters, creating significant noise pollution and frequent complaints.

Unlike conventional loudspeakers, BESTAR directional speakers strictly confine sound waves within a designated area. The core technology modulates audio signals onto an ultrasonic carrier wave and leverages the directional propagation characteristics of ultrasound combined with the nonlinear effects of air to achieve targeted audible sound projection. In simple terms, this technology “locks” sound within a defined zone—clear and intelligible within it, while drastically reduced or silent outside of it.

This innovation effectively addresses three major pain points of traditional traffic alert systems: unfocused sound diffusion, poor speech intelligibility in noisy environments, and noise pollution. Particularly at night—when ambient noise levels drop significantly—directional sound ensures that warning messages reach only pedestrians and vehicles at intersections, while surrounding residential areas remain quiet. The system operates reliably across a wide temperature range and under harsh weather conditions, ensuring 24/7 stability and safety support.

Currently, this groundbreaking technology has been piloted in multiple cities, offering a new acoustic solution for smart city development and marking a new stage of precision, intelligence, and environmental friendliness in sound propagation.

Beyond smart traffic, BESTAR directional speakers have been deployed in various other applications.

In exhibition halls and museums, they can create independent audio zones for each exhibit—visitors hear commentary only when approaching a specific display, allowing multiple zones to operate quietly and simultaneously. In school playgrounds, sound can be focused precisely on activity areas, significantly reducing noise impact on classrooms and nearby residents. Additionally, the technology can be applied to ATM voice prompts, community dance events, and other public scenarios—delivering necessary information directionally while avoiding disturbance to others.