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With the advancement of new industrialization and urbanization, noise pollution has become a prominent environmental problem. In 2023, there were 5.706 million noise complaints nationwide, accounting for 61.3% of all environmental complaints, ranking first among all types of pollution. Automatic noise monitoring systems, through real-time monitoring and data management, provide effective solutions for the construction of smart and environmentally friendly cities.
01 Policy background and market demand drive the construction of monitoring systems
The state attaches great importance to noise pollution prevention and control. The Noise Pollution Prevention and Control Law came into effect in June 2022, clearly stipulating the monitoring of various types of noise. The "Ten Measures for Noise Control" in 2023 required prefecture-level cities to complete the construction and networking of automatic monitoring systems by the end of 2024. By the end of 2024, 338 prefecture-level and above cities nationwide had built 4,005 automatic monitoring points, achieving a leap from manual to automatic monitoring.
02 Core technologies of the system enable precise monitoring and intelligent analysis
Modern automatic noise monitoring systems are based on advanced digital filtering and digital detection technologies, enabling simultaneous and accurate measurement of sound pressure levels using various time-weighted and frequency-weighted methods, and supporting real-time 1/3 octave band spectrum analysis.
System architecture and perception layer
An automatic environmental noise monitoring system typically consists of a primary sound level meter, a network transmission layer, and a sound environment monitoring platform. Through front-end data acquisition, transmission, and calculation, and back-end display on a large screen, combined with AI voiceprint recognition technology, it achieves functions such as real-time noise monitoring, anomaly alarms, exceeding-standard events, remote supervision, data query, and compliance evaluation.
The system's perception layer includes a noise monitor, a meteorological monitoring unit, an outdoor full-color LED display screen, a video surveillance + sound source localization + voiceprint recognition module, and a traffic flow monitoring substation. Among them, the voiceprint recognition technology can effectively identify hundreds of noise sources in four categories: traffic, industry, construction, and social life, and perform analysis and early warning, with an accuracy rate of over 85%.
03 Sanyuan Environment's Case Study: Technology Empowering Noise Control
Wuhou District, Chengdu
Sanyuan Environment provides a solution for public noise control that combines technology and humanism with its integrated solution of "automatic noise monitoring + directional sound transmission" .
Smart monitoring: Digital ears accurately capture noise
The Sanyuan Environmental Noise Automatic Monitoring System provides a precise and digital management tool for public noise control:
Real-time monitoring: Employs high-precision sensors for 24/7 continuous monitoring, with data uploaded to the cloud platform in real time.
Intelligent Recognition: Based on AI algorithms, it automatically identifies the type of noise source, distinguishing between square dance music, traffic noise, construction noise, etc.
Early warning and response: When noise levels exceed the standard, the system automatically sends an early warning message to the mobile phone of the management personnel to guide on-site handling.
Data tracing: Generate noise variation curves to provide objective evidence for law enforcement and management.
Chaoyin Waterfront, Wuhou District, Chengdu
Directional sound transmission: allowing sound to propagate within a designated area.
The 3D ambient directional sound system uses ultrasonic carrier technology to achieve directional sound wave propagation, precisely controlling the coverage area. Sound is clear directly in front, with significant attenuation from the sides and rear. It supports independent management of multiple zones, ensuring no interference between content in each zone, and automatically adjusts the volume according to ambient noise to guarantee optimal listening quality.
Actual measurements show that the sound pressure level can reach 75 decibels at 20 meters directly in front of the speaker, while it drops to below 55 decibels at 10 meters to the side, effectively reducing the impact on the surrounding environment.
Collaborative Applications: Creating Closed-Loop Management
Sanyuan Environment has organically combined an automatic noise monitoring system with a directional sound transmission system to form a complete noise control solution. Through comprehensive measures, noise complaints at Chaoyin Waterfront have decreased by 95% year-on-year, the satisfaction rate in follow-up visits has reached 96%, the police dispatch rate has decreased by 90% year-on-year, and the overall law enforcement cost has decreased by 80%.
04. The system plays a key role in building smart and environmentally friendly cities.
The automatic noise monitoring system uses voiceprint recognition and sound source localization technology to accurately trace the location and frequency of noise, providing a basis for noise control. The system transmits and analyzes data in real time, enabling hourly problem identification and rapid information flow, significantly improving regulatory response efficiency. It also promotes data transparency; many cities have already released monitoring data in real time, enhancing public participation.
05 Future Development Trends
To date, more than 3,800 automatic monitoring stations have been built in prefecture-level and above cities across the country, fully realizing automatic monitoring of the acoustic environment quality in functional areas.
With the continuous development of IoT, big data, and AI technologies, automatic noise monitoring systems will become more intelligent and precise. Future smart and environmentally friendly cities will be quiet, harmonious, and livable environments, and automatic noise monitoring systems are laying a solid foundation for this, making cities more peaceful and beautiful.
Through technological innovation and effective case studies, Sanyuan Environment has identified the greatest common denominator of public needs, making urban life more beautiful and harmonious.