Most schools are located in urban centers, particularly elementary, middle, and high schools. Campuses are filled with various sounds, especially high-decibel broadcast systems. The issue of campus noise has caused significant distress to residents in surrounding communities, making it imperative to resolve this problem!

Conflicts between schools and neighboring areas include:

• Existing broadcast systems are too close to adjacent buildings, causing serious noise disturbances.

• Conflicts between teaching and activities: uneven distribution of broadcast systems results in unclear announcements, and sports activities disrupt normal classes.

• Internal school conflicts: widely spaced broadcast systems cause prolonged reverberation, reducing clarity and causing audio delays.

To prevent noise pollution, protect public health, improve the campus and surrounding environment, maintain social harmony, promote ecological civilization, and support sustainable economic development, Doctor of Directional Listening HOLORAY and Qingwen Yunyin’s Smart Campus Broadcast System have launched the "Campus Noise Reduction" initiative. Using technological means, we transform campus broadcast systems to eliminate noise at its source, restoring an excellent, quiet, and pleasant living and working environment for all. The Doctor of Directional Listening HOLORAY and Smart Campus Solution fundamentally address noise pollution by enabling highly directional sound transmission, achieving zonal noise reduction and ideal quiet community effects.

How Doctor of Directional Listening Solves Campus Broadcast Issues:

• Noise Disturbance Resolution: Based on directional sound propagation principles, sound attenuates as the angle increases, confining audio to specific areas and reducing impact on surrounding zones.

• Reverberation Elimination: Scientific placement design resolves reverberation issues caused by open spaces and varying sound intensities, ensuring balanced sound fields without echoes or delays.

• Enhanced Speech Clarity: Proprietary directional audio technology uses air demodulation to generate targeted audible sound, enabling directional transmission with superior clarity.

• Synchronized Audio: Hardware-software compatibility ensures true audio synchronization, maintaining consistent information across near and far areas.

• Durability Improvement: HOLORAY® coating technology (Petalite of Bikita) passes最高等级IP65 testing, operating reliably in extreme temperatures and humidity while enhancing longevity.

Doctor of Directional Listening L-Series products and Qingwen Yunyin’s Smart Campus Broadcast System use proprietary sound field control technology to concentrate audio energy in designated directions and spaces, ensuring clear and melodious broadcasts within schools while instantly reducing external noise.

Post-renovation, dynamic sound field balance is achieved, eliminating reverberation and improving clarity.

After renovation, impact on surrounding residential areas is minimized, with noise levels reduced to below environmental standards.

Key Features of Doctor of Directional Listening L-Series Products:

• High directivity with precise coverage control; effective range of 60 meters per unit without disturbing surroundings.

• Eco-efficient audio delivery within the main sound field, minimizing distortion.

• Globally领先的beam control algorithms and multi-channel real-time audio processing.

• Compatibility with infrared sensors, wireless Bluetooth, IP networks, and 4G/5G controls.

• Proprietary adaptive volume adjustment and multi-unit cascading功能.

• Broadcast-grade system control for multi-network and multi-platform operation.

• Weather-resistant design (rain, mold, sun, corrosion) for harsh environments, tested under extreme temperatures.

• Easy installation, low maintenance, and flexible adjustments.

 Example installation along school perimeter walls.

Example installation along school perimeter walls.

Example installation on teaching building walls.

Example installation on rubber track playground fences at a Beijing school.

Example installation on both sides of a podium at a Beijing school.

Using unique directional sound technology, campus broadcast audio is concentrated in fixed areas, achieving balanced sound fields. Over 50 schools in Beijing, Chongqing, Shenzhen, and other regions have completed installations. Post-renovation, zero complaints have been reported, with ambient noise controlled below 55 dB, meeting Class 1 standards of China’s Noise Pollution Prevention and Control Law.