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With the advancement of new industrialization and urbanization, noise pollution has become a prominent environmental issue. In 2023, noise complaints reached 5.706 million nationwide, accounting for 61.3% of all environmental petitions, ranking first among all types of pollution. Automatic noise monitoring systems, through real-time monitoring and data management, provide an effective solution for the development of smart and environmentally friendly cities.
01 Policy background and market demand promote the construction of monitoring system
The country attaches great importance to noise pollution prevention and control. The "Noise Pollution Prevention and Control Law" came into effect in June 2022, specifying the monitoring requirements for all types of noise. The 2023 "Ten Measures on Noise" mandated that prefecture-level cities complete the construction and networking of automatic monitoring systems by the end of 2024. By the end of 2024, 4,005 automatic monitoring points had been established in 338 cities at the prefecture level and above, marking a significant leap from manual to automated monitoring.
02 System core technology enables precise monitoring and intelligent analysis
Modern automatic noise monitoring systems are based on advanced digital filtering and digital detection technologies. They can simultaneously and accurately measure multiple time-weighted and frequency-weighted sound pressure levels and support real-time 1/3 octave spectrum analysis.
System architecture and perception layer
An automatic environmental noise monitoring system typically consists of a first-level sound level meter, a network transmission layer, and an acoustic environment monitoring platform. Through front-end data collection, transmission, and calculation, back-end large-screen display, and AI voiceprint recognition technology, it enables real-time noise monitoring, anomaly alarms, over-the-limit events, remote supervision, data query, and compliance evaluation.
The system's perception layer includes noise monitors, a weather monitoring unit, an outdoor full-color LED display, video surveillance, sound source localization, and voiceprint recognition modules, as well as a vehicle flow monitoring substation. Voiceprint recognition technology can effectively identify hundreds of noise sources across four categories: traffic, industry, construction, and social life. It can also analyze and issue warnings, with an accuracy rate exceeding 85%.
03 Sanyuan Environmental Practice Case: Technology Empowers Noise Control
Wuhou District, Chengdu
Sanyuan Environment’s integrated solution of “automatic noise monitoring + directional sound transmission” provides an answer to public noise management that emphasizes both technology and humanity.
Smart Monitoring: Digital Ears Accurately Capture Noise
The three-element environmental noise automatic monitoring system provides a precise and digital management tool for public noise control:
Real-time monitoring: Using high-precision sensors to conduct 24-hour uninterrupted monitoring, and uploading data to the cloud platform in real time
Intelligent identification: Based on AI algorithm, it can automatically identify the type of noise source and distinguish between square dance music, traffic noise, construction noise, etc.
Early warning and disposal: When the noise exceeds the standard, the system automatically sends an early warning message to the manager's mobile phone to guide on-site disposal
Data tracing: Generate noise change curves to provide an objective basis for law enforcement management.
Chaoyin Waterfront, Wuhou District, Chengdu
Directional sound transmission: allowing sound to spread in a specified area
The three-dimensional directional sound system uses ultrasonic carrier technology to achieve directional sound propagation, precisely controlling coverage. Sound is clear in front of you, while sound is significantly attenuated to the sides and rear. It supports independent management of multiple zones, ensuring content in each zone does not interfere with each other, and automatically adjusts volume based on ambient noise to ensure optimal listening.
Actual measurements show that the sound pressure level can reach 75 decibels 20 meters in front of the speaker, while the sound pressure level drops to below 55 decibels 10 meters to the side, effectively reducing the impact on the surrounding environment.
Collaborative application: creating closed-loop management
Sanyuan Environmental has integrated an automatic noise monitoring system with a directional acoustic system to create a comprehensive noise control solution. This comprehensive approach has resulted in a 95% year-on-year decrease in noise complaints at Chaoyin Waterfront, a 96% satisfaction rate among follow-up visits, a 90% year-on-year decrease in police response rates, and an 80% reduction in overall enforcement costs.
04 The system plays a key role in the construction of smart and environmentally friendly cities
The automatic noise monitoring system uses voiceprint recognition and sound source location technology to accurately trace the location and frequency of noise, providing a basis for governance. The system transmits and analyzes data in real time, enabling hourly problem identification and rapid clue transfer, significantly improving regulatory response efficiency. It also promotes data transparency, with many cities releasing monitoring data in real time to enhance public participation.
05 Future Development Trends
By now, more than 3,800 automatic monitoring stations will have been built in cities at the prefecture level and above across the country to fully realize automatic monitoring of the sound environment quality in functional areas.
With the continuous development of the Internet of Things, big data, and artificial intelligence technologies, automatic noise monitoring systems will become more intelligent and precise. The smart, environmentally friendly city of the future will be a quiet, harmonious, and livable environment. Automatic noise monitoring systems are laying a solid foundation for this, making cities more peaceful and beautiful.
Sanyuan Environment has found the greatest common denominator of public needs through technological innovation and case effectiveness, making urban life more beautiful and harmonious.