In today's increasingly compact urban space and constantly improving educational environment, how to meet the needs of campus broadcasting teaching and activities while also considering the quality of the surrounding acoustic environment is becoming an important issue in campus acoustic environment governance.

Recently, Suzhou Zhenhua Middle School and Suzhou Industrial Park Fangzhou Primary School have successively introduced the quiet playground system (campus directional sound system) independently developed by Qingting Acoustics, exploring new paths for campus sound environment governance through innovative acoustic technology.

　　The 'Silent Challenge' of Ancient City Campus

　　Source noise reduction achieves harmonious integration

-Suzhou Zhenhua Middle School-

Suzhou Zhenhua Middle School is located in the ancient city area, with the campus playground separated from the surrounding residential areas by only a wall. For a long time, the daily broadcast sound of the school has caused inconvenience to the lives of community residents. In order to balance teaching needs and community peace, the school actively seeks innovative sound environment solutions.

The Clear Listening Acoustics team conducted sound field detection and data analysis for the special location of Zhenhua Middle School, and tailored a "Quiet Playground System (Campus Directional Sound System)" solution. In the actual deployment process, the R&D team refined and debugged the angle and coverage range of each device. The system is based on the directional sound technology of Clear Listening Acoustics core, combined with local sound field control technology and A-AFC algorithm, and breaks through the problem of controlling the sound field at the back of the system, achieving strong "sound locking" of the sound field behind the equipment, making the maximum sound pressure difference between the front and rear of the equipment reach 40dB. The sound energy is confined to the target area for directional propagation, effectively reducing noise interference to surrounding residents.

After the system was put into use, the campus broadcasting was clear and orderly, and the noise in the surrounding communities was significantly reduced, truly achieving a win-win situation of "teaching without disturbing neighbors and a quieter campus".

　　Acoustic Upgrade of Modern Campus

　　From technology empowerment to sound field equalization

-Fangzhou Primary School in Suzhou Industrial Park-

Unlike Zhenhua Middle School's "silent appeal", Fangzhou Primary School located in Suzhou Park hopes to use acoustic technologyImprove the sound field balance and listening comfort in the playground area.

During the communication process of the Fangzhou Elementary School project, the Clear Listening Acoustics team deployed several quiet playground systems (campus directional sound systems) on both sides of the playground based on scientific planning and professional point design. They used beamforming and sound energy distribution optimization algorithms to achieve uniform coverage of broadcast sound in different areas, ensuring consistent sound perception in the center, sides, and runway areas of the playground. Students could hear clear and balanced broadcast sound in any corner of the playground, avoiding the problem of traditional broadcasting being "harsh in the near area and blurry in the far area"; At the same time, the system uses sound wave control to concentrate and cover the sound energy in the target playground area, effectively suppressing the overflow of sound to surrounding communities and achieving a non-interference effect of "clear inside the playground and peaceful outside the playground".

From noise control in the ancient city area to sound field optimization in modern campuses, the "Quiet Playground System (Campus Directional Sound System)" in clear acoustics has gradually become a new standard for campus sound environment construction, with directional sound propagation and professional sound field design as its core. It not only helps schools eliminate noise disturbance problems from the source, but also creates more comfortable and efficient teaching and activity sound fields through scientific acoustic design, helping to build a new campus sound state that is "quiet, audible, clear, and harmonious".

　　From National Honor to Thousand School Verification

　　Witness solid and stable hard power

In the field of sports, Guo is a family level professional, refined, and innovative little giant

In April 2025, Qingting Acoustics' "Quiet Playground System (Campus Directional Sound System)" was successfully evaluatedA family level "specialized, refined, unique, and innovative" little giant in the field of sportsEnterprise, this honor is a national level certification of the company's technological depth and application breadth in specific fields. Guo family level+1! Qingting Acoustics has been listed as a "specialized, refined, and innovative" small giant enterprise in the sports field

The beamforming directional sound technology of the quiet playground system (campus directional sound system) has been around for a long timeIn 2021, it was selected for the National Advanced Pollution Prevention and Control Technology Catalogue (in the fields of air pollution prevention and control, noise and vibration control),Become a technical support unit. At the end of August 2024,13 ministries and units including the Ministry of Ecology and Environment and the Central Office for the Construction of Spiritual CivilizationIn the "China Noise Pollution Prevention and Control Report (2024)" released, it is stated thatHighly praised for the implementation of technology noise reduction through the installation of directional speakers.

In addition, the quiet playground system (campus directional sound system) has repeatedly won awardsCCTVandRecognition of special reports by local mediaTo demonstrate its leading position in the field of environmental noise reduction.

Up to now, the "Ten thousand proofreading and listening" action plan launched by the Institute of Acoustics, Chinese Academy of Sciences20+provinces and cities，60+cities, 5000+schoolsTo achieve practical deployment and become a benchmark for upgrading the campus acoustic environment, Clear Listening Acoustics, with reliable technical strength and extensive market verification, continues to promote the deep integration of acoustic technology and educational scenes, providing solid support for building a peaceful and harmonious educational environment.