Abstract: OBT is a high-tech enterprise in Shenzhen and a listed company in Shenzhen Qianhai Equity Exchange Center. Since its establishment in 2003, OBT has been committed to designing a high-quality public broadcasting system for the public building sector. In 2016, it successfully established Shenzhen Longhua Niulan Front School. The IP digital public address system was designed to integrate background music, publicity, paging broadcasts and emergency broadcasts of fire accidents to build a harmonious and safe learning environment.

 Background of the project

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In front of Niulan in Bao'an District, Shenzhen, it is a nine-year-old private school approved by the Baoan District Education Bureau. So far, more than 70 million yuan has been invested. The school is located next to the Niulanqian Community in Minzhi Street. The transportation is very convenient, the campus is quiet and elegant, and the air is fresh. The school covers an area of 17,000 square meters and a building area of 13,356 square meters. The sports area, teaching area and living area are relatively independent. The design is safe and scientific, and the layout is reasonable. The building is a major square, the campus is full of flowers and the four seasons are green. It is a collection of "schools." "Beautiful school" with "garden" and "park".

There are 35 classes and 1639 students. Among them, there are 6 classes in junior high school, 309 students, 29 classes in primary schools and 1,330 students. There are 75 faculty members in the school, including 58 full-time teachers and 5 executives. College degree or above is 49. Among them, there are 22 undergraduate degrees, and the academic achievement rate is 100%. There are 17 senior teachers in secondary schools, senior teachers in primary schools and teachers in secondary schools, accounting for 22% of the total number of full-time teachers. The average age of teachers is 27 years old. In the past three years, the school's education and teaching work has achieved fruitful results. In 2007, it was awarded the "National Chinese Teaching Demonstration School" and the district-level school by the National Education Association of the National Education Association. In 2006, it was named "Advanced Unit of Family Education" in Baoan District, and the "Three Items" of the Street Private School in 2005. second prize. The school won a total of 6 awards, and teachers and students received 176 awards at various levels.

At the beginning of the school, the school established the idea of "governing schools according to law, standardizing management, uniting and fighting, and creating a harmonious atmosphere". The school conscientiously implements the national education policy, adheres to "the moral education is the first, the teaching is the main, and the education is the basis", and comprehensively, solidly and effectively promotes quality education, ensuring the socialist school-running direction and the implementation and implementation of the party's educational policy. It has clearly established the school-running direction of "survive by quality, develop by characteristics, and thrive by service", and strive to realize the mission of "loyal education, educating people, serving the society, and benefiting future generations". After nearly three years of hard work, it has laid a solid foundation for the creation of a high-quality private school with high starting point, excellent equipment, strict management, excellent team, good quality, beautiful environment and determined innovation. Now the school motto of "thickness, wisdom, beauty, innovation", the school spirit of "unity, love school, honesty, and civilization", the teaching style of "love, rigor, enlightenment, innovation", "respecting teachers, obedience, diligence, The academic style of "going forward" has taken root in the hearts of teachers and students and constitutes a cultural force that promotes the sustainable development of schools. The school in front of the bullpen will never give up in the education and teaching service, and will always contribute to the party's education.

 customer demand

1. Realize regular ringing, background music, and test English listening.

2. The online courseware can be played in the classroom, and the self-made courseware can be ordered on demand.

3. In the sports field, the broadcasting demand for morning exercise and sports meeting can be realized. In the playground broadcasting room, the leader can speak remotely and meet the use of playgrounds, sports fields and other areas.

 solution

The whole system design is as follows: The school public broadcasting system requires strict design according to the campus public broadcasting design requirements, combined with relevant design standards and campus drawings. The public broadcasting system design requirements meet the campus background music broadcasting, information broadcasting, broadcast notification, emergency broadcasting. The broadcast server is located in the school broadcast room, etc. The classroom uses wall-mounted broadcast terminals and speakers to achieve point-to-point broadcasting; the playground is equipped with wireless microphones, high-power amplifiers, and high-power outdoor waterproof sound columns to meet the broadcasting needs of playground remote speech.

Achieve the effect:

The main function of the broadcasting system is to play the eye-protection, play background music, conference radio, English listening test and the school's daily school bell ringing, to meet the school's campus broadcasting, multimedia teaching, etc., to broadcast campus programs in after school hours, to enrich students' extracurricular activities. The entire broadcast system is designed to meet the following functions.

1. The system is based on IP network and follows the TCP/IP protocol.

Multi-purpose, multi-use, make full use of IP network resources, avoid repeating the installation of lines, and have Ethernet interfaces to connect digital broadcast terminals, truly realize the multi-network integration of broadcasting and computer networks. The external audio (card, CD, radio, microphone, etc.) is connected to the audio server software for real-time compression into a high-quality data stream, and the broadcast data is transmitted through the computer network, and the digital broadcast terminal can receive and play through the built-in speaker in real time.

2. Multiple sets of programs play simultaneously

Each terminal can be set to play different content, that is, one set of programs corresponds to one terminal, and does not interfere with each other. The terminal volume is independently controlled.

3. Arbitrarily choose paging

By paging the mic on the IP network or a computer on the network and installing the workstation software, you can broadcast the speech and specify to broadcast to all, part or a single terminal.

4. Timed ringing

The system can automatically turn on and off the power of the device according to the settings, and the set of working hours is programmed 24 hours a day (accurate to the second). User-friendly music ringtones, inter-class exercises, and automatic broadcast of radio programs. Different school bells and breaks can be set every day to play campus songs and flag-raising, class exercises, eye-protection keys, etc., to enrich campus life. The schedule of work and rest can be automatically adjusted according to the spring and autumn to issue a notification broadcast to timely convey various information.

5, can achieve remote control and paging function

Through the management room's main control room broadcast microphone or remote call station, the principal can send out the management information of the school in his own office without going to the computer room; the remote paging station can broadcast the speech to all grades or a certain grade of the whole school.

6. Voice real-time broadcast

The real-time broadcast function of the IP network broadcast program can compress and store the programs from other sound sources in real time to the server, and can simultaneously broadcast to the designated workshop terminal as required. The source of the broadcast can be other commercial or self-use radios, recorder decks, CD players, MP3 players, microphones, and the like.

7. Free on demand

The leader controls the digital broadcast terminal distributed in each area to complete any on-demand of the data library in the audio server through the remote controller. The operation is simple and convenient.

8, offline operation

The entire broadcast system has both networked and offline modes of operation, and can still perform scheduled tasks in the event of a network failure.

9, unattended

The IP digital broadcast server can realize automatic power on and off, automatically recognize the date after booting every day, and then call the playlist of the day to automatically play, and realize unattended operation.

10. Audio amplification

The voice terminal of the company's IP network broadcast provides audio access. When there is no broadcast signal, the audio output of the computer can be connected to the voice terminal and broadcasted by sound reinforcement.

11. Emergency fire broadcast

The system can access fire alarm signals to achieve fire linkage and support adjacent layer alarms. The terminal has a strong cut function to control the three-wire sound controller.

12. Amplifier power control

The digital broadcasting terminal can automatically switch the power of the power amplifier according to the presence or absence of the voice signal, and avoid the power amplifier to work for a long time for 24 hours.

13. Audio material production

Enable recording, conversion, and editing of digital material. The system server can store music programs or voice programs for thousands of hours or more.

 client feedback

1. The software operation is very user-friendly; it is easy to learn and easy to operate. It can realize unified management and unified broadcasting in the broadcast control center.

2. The system has stable performance, low failure rate and simple maintenance. The server can monitor the working status of each area in real time through the server.

3, the broadcast microphone is convenient to talk, can be divided into broadcast, the whole district broadcast, no need to go to the broadcast room, as long as there is a network place to access can speak.

4. The system partition is more flexible, freely combinable, freely distributed, and breaks the traditional physical partition. Once the pre-design is completed, it is very troublesome to adjust the partition later. After adopting the IP network broadcast system, there is no need to worry about the partition. And the partition name can be edited at will.

5, the broadcast program is very rich: IP network system is equipped with CD player, tuner, music program library, to meet the music playback of each classroom, and can play different content at different time in different areas. The front-end partition terminal can also freely order, the music program on the server or the local terminal, and can repeat AB in English teaching to improve the students' English word memory ability.