On June 27, the 20th China International Small and Medium Enterprises Fair (hereinafter referred to as "CISMEF") grandly opened in Area D of the Guangzhou Pazhou Complex. As the highest-level and largest international event for SMEs in the Asia-Pacific region, it attracted a dazzling array of innovative products.

Hainan Qingwen Yayin (a National Intellectual Property Advantage Enterprise) made a stunning appearance with the "Doctor of Directional Listening" directional audio system! When visitors stepped into the exhibition area, clear human voices immediately reached their ears: "Welcome to experience Doctor of Directional Listening." With a step sideways, the sound instantly dissipated as if touching an invisible barrier. "It's like sound magic!" exclaimed exhibitors. "No matter how noisy the venue gets, the sound only targets intended users!" This is the "sound barrier" created by Doctor of Directional Listening—using ultrasonic acoustic technology to direct sound waves like a flashlight beam, sparking a quiet revolution at CISMEF.

Ending Pain Points: Solving Noise Pollution!
Traditional sound diffusion causes mutual interference—unclear audio in exhibitions, disruptive advertisements, and square dance complaints all stem from "uncontrolled sound." Doctor of Directional Listening，enabling precise sound navigation:

1. Ultrasonic Modulation: Human voices/music are loaded onto 40kHz ultrasonic waves.

2. Air Self-Demodulation: Automatically5° narrow-angle sound beams.

3. Sound Zone Locking: Clear transmission within the target area, with a 90% sound pressure drop outside.

Core Strength: The "Chinese Solution" in Acoustics
Behind Doctor of Directional Listening lies Qingwen Yayin's decade of积淀: technical support from dual labs at Tsinghua University and Nanyang Technological University, validation from national-level venues like the National Museum and World Expo pavilions, and global accolades including the Pitch@Palace Global and Intel Innovation Award. "We design 'sound traffic rules'—using technology to restore order to noise and make tranquility universally accessible."

The debut of Doctor of Directional Listening at CISMEF is not just a product display but a重塑 of "sound civilization": technology will ultimately return clamor to order and make quietness a universal right.