Lankao County No. 2 Senior High School and other primary and secondary schools, as core areas of regional education, urgently need a professional audio system adapted to teaching scenarios. This system needs to cover all scenarios, including classrooms, playgrounds, auditoriums, corridors, and canteens, meeting core needs such as multimedia teaching amplification, campus schedule management, and emergency notification broadcasting. It must also comply with national standards such as GB/T50526 "Technical Specifications for Public Broadcasting Systems," ensuring clear and understandable speech, simple and easy operation, and stable and reliable operation, creating a safe and efficient auditory learning environment for teachers and students.

1. Project Background and Core Requirements 

Lankao County's primary and secondary schools experience a daily student and teacher flow exceeding 10,000, with intensive and diverse teaching activities, placing multiple demands on the audio system:

• Full-Scene Coverage: The system must be adaptable to various spaces, including a 60㎡ standard classroom, a 400-meter running track, and an 800-seat auditorium, totaling over 50,000 square meters.

• Teaching Adaptability: Classroom sound reinforcement must achieve 3-5 meter pickup without feedback, with speech clarity ≥95%, meeting the needs of multimedia lectures and group discussions.

• Emergency Reliability: The system must support integration with the fire protection system, with emergency broadcast switching time ≤1 second and sound field unevenness ≤5dB, ensuring accurate transmission of evacuation instructions.

• Ease of Operation: The system must be adaptable to non-professional teacher operation, supporting remote control via mobile APP and automatic playback of scheduled alarms.

2. Core Technologies and Innovations

2.1 Full-Domain IP-Based Audio Network 

The system adopts a digital transmission architecture conforming to education industry standards, achieving synchronous transmission of audio signals and control commands through the existing campus LAN. Compared to traditional constant-voltage systems, wiring is reduced by 60%, supports cross-campus zone management, and can simultaneously play differentiated content to different grades (e.g., playing eye exercises for first-year junior high students while the classroom is quiet for senior high students).

2.2 Dedicated Teaching Amplifier System: 

A customized Class D intelligent amplifier integrates echo cancellation (≥512ms tail echo cancellation) and automatic gain control (-12dB to +12dB adjustment), improving acoustic gain by ≥15dB. It effectively filters environmental noise from air conditioners, fans, etc., ensuring distortion-free audio during recorded lessons and online teaching. Standby power consumption is ≤0.5W, saving over 40% more energy than traditional amplifiers.

2.3 Scene-Specific Speaker Configuration

3. Solution Performance Advantages

• Teaching-Grade Speech Intelligibility: Employing an adaptive noise reduction algorithm, speech intelligibility reaches 96% in noisy environments, meeting the requirements of GB3096 "Environmental Noise Quality Standard" for teaching areas.

• Dual-Mode Redundancy Guarantee: Supports IP network + constant-voltage backup dual modes, automatically switching in case of network failure to ensure uninterrupted operation during critical scenarios such as the National College Entrance Examination (Gaokao) and the Senior High School Entrance Examination (Zhongkao).

• Lightweight Operation and Maintenance Management: Equipped with a dedicated campus management platform, enabling remote monitoring of equipment status and batch updates of school bells, reducing on-site maintenance workload by 80%.

• Complete Compliance Certifications: All equipment has passed 3C mandatory certification and ISO9001 quality system certification. Speaker units have undergone CNAS salt spray testing, suitable for long-term use on campus.

4. Implementation and Service Guarantee

• Customized Acoustic Design: Addressing issues such as classroom reverberation time and wind speed interference in the playground, speaker layout is optimized after on-site surveying to ensure sound field uniformity meets standards.

• Phased Installation and Debugging: Construction will be carried out during winter and summer vacations to avoid disrupting teaching. Teacher training will be provided upon completion to ensure rapid system deployment.

• Long-Term After-Sales Service: A 5-year warranty (including speaker units) will be provided, along with a 24-hour emergency response mechanism. Faults within the county will be addressed within 4 hours.

Conclusion: 

This solution, through the deep integration of digital technology and educational scenarios, not only solves the pain points of traditional campus broadcasting such as poor sound quality, complex operation, and difficult maintenance, but also, through a design compliant with GB/T38186 "Guidelines for Smart Campus Construction," builds a scalable acoustic infrastructure for primary and secondary schools in Lankao County. After project implementation, teaching sound reinforcement efficiency has increased by 30%, and emergency response speed has been reduced to the second level, fully demonstrating the company's technological expertise in the field of educational audio and providing a standardized acoustic solution reference for the construction of smart campuses in primary and secondary schools.