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Campus wireless FM broadcasting system solution

(Summary description)User requirements: In order to improve the management of the campus and build a digital campus, instead of the traditional bell-type ringing system with a single function, a set of intelligent campus broadcast systems are constructed.

Campus wireless FM broadcasting system solution

(Summary description)User requirements: In order to improve the management of the campus and build a digital campus, instead of the traditional bell-type ringing system with a single function, a set of intelligent campus broadcast systems are constructed.

Information
1. User requirements:
In order to improve the management of the campus and build a digital campus, instead of the traditional bell-type ringing system with a single function, a set of intelligent campus broadcasting systems was constructed. Because the school covers a large area and has been used for many years, the pavement of each channel has been hardened. It is very inconvenient and unattractive to broadcast the large area of ​​the broadcasting system. Considering the actual situation of the school and the site environment, a set of The main intelligent broadcast system. Specific requirements are as follows:
1.1 The system has a unified and centralized management function.
1.2 The system has the functions of timing, fixed point, whole area, partition, group automatic, manual play ringtones, etc.
1.3 The system has the function of broadcasting the information of the whole area, district and group.
1.4 The system can independently broadcast and play background music to the classroom.
1.5 requires the dormitory building to be able to receive campus broadcasts as well as information broadcasts and background music separately.
1.6 The dining hall is required to receive campus broadcasts normally. Outside teachers and students can play background music locally while dining.
1.7 Requires the playground to be able to receive campus broadcasts in addition to the daily national flag raising, morning exercises, school meetings and other activities for local program broadcasting.
1.8 It is required that the passageway on the campus should be mainly equipped with outdoor waterproof sound columns, and some green belts should be equipped with animal-shaped grass speakers.
 
Solution:
The school is a key middle school. The function of intelligent broadcasting mainly focuses on maintaining the order of the campus, ringing bells and information broadcasting at regular intervals, and also providing a safe and stable listening system support for the school's examination system. After investigation and analysis, our company decided to use the campus wireless addressable intelligent broadcasting system specially developed and produced for campus broadcasting in the HARMAN broadcasting series. This system uses radio transmission coverage technology, does not require large-area wiring, saves costs, and has simple system operation. , Strong functions, strong compatibility, unlimited expansion and other advantages are widely used in campus and other public places.
 
2.1 System Architecture Diagram
img
2.2 System Introduction:
2.2.1 wireless campus broadcast sound source design:
   The wireless campus broadcast sound source is composed of computer sound source, deck, DVD, digital tuner, microphone, mixer and so on. Users can choose one according to the actual situation: configure one deck for tape playback; configure one DVD for VCD, CD, DVD, MP3 and other optical disc playback. One digital tuner is configured to broadcast programs of the Central People's Broadcasting Station and local radio stations; one mixer is configured, and all audio sources first enter the mixer, and then enter the transmitting device for transmission through the mixer. This configuration That is, all the sound source equipment can be managed systematically and uniformly, and the volume of the playback sound source can be adjusted and the tone of the analog sound source can be corrected. As shown below:
img
2.2.2 wireless campus broadcast editor design:
   The audio editing software and computer are combined into a digital audio workstation, which digitizes audio signals, recordings, and line signals, and is compatible with multi-format digital signals in MD, DVD, MP3, and hard disks, and edited into complete high-quality broadcasts according to the requirements of the program program.
As shown below:
img
2.2.3 Wireless campus broadcast control design:
   The combination of a public multiple-address coding controller and a computer provides intelligent and automated control of campus wireless broadcasts. With coded remote control, you can freely control the broadcasting of a certain point or area on the interface, and you can also control it manually.
As shown below:
img
2.2.4 Wireless campus broadcast transmission design:
   The FM radio transmitter used in the campus radio broadcasting scheme is a high-quality transmitter that has been produced by the National Radio Commission and has been approved for production. It adopts advanced technologies such as microcomputer phase lock, flash storage, digital error correction, and switching power supply. In particular, its front stage uses the most advanced dual-frequency lock-frequency subcarrier remote control coding technology with accurate and stable frequency, and the remote control speaker is turned on and off reliably, ensuring that the broadcasting system can run stably for a long time.
2.2.5 Erection design of transmitting antenna:
   The transmitting antenna is erected on the edge of the playground, which is empty and surrounded by obstacles. The antenna pole is 6 meters in length to ensure that the wireless signal can be transmitted and covered farther.
As shown below:
img
2.2.6 campus radio broadcast receiving design:
(1) Outdoor channels, green belts are equipped with FM sound columns and animal-shaped grassy FM speakers.
(2) The classroom uses wooden FM speakers.
(3) The listening classroom is equipped with FM headphones to meet the needs of the listening test.
(4) The school's playground is usually a place for morning exercises to start school meetings and self-hosted programs. It is equipped with FM receivers + wireless microphones + outdoor waterproof fixed pressure sound columns to meet the needs, and it can normally receive daily campus broadcasts. It can broadcast and play background music locally through wireless microphones and FM receivers and receivers.
(5) Canteens and dormitories are equipped with FM receivers + wireless microphones + indoor fixed-pressure speakers to meet the needs. In addition to receiving daily campus broadcasts, wireless microphones and FM receivers can be used to locally broadcast and play background music. As shown below:
img
2.3 Features of campus wireless broadcasting system
 
2.3.1 Wireless transmission: adopts high-precision frequency phase-locked loop FM broadcast transmitter. The entire campus radio broadcasting system does not require pole pole wiring and is simple and convenient to install.
 
2.3.2 Auto play: It can be set to play the worksheet every Monday to Sunday, and regularly broadcast the bells for class, background music, radio gymnastics, song ringtones, etc. The system automatically plays according to the set program, and truly realizes unattended operation.
 
2.3.3 Digital Audio Editing: The current advanced digital audio workstation is used as the host to digitize audio signals, recordings, and line signals, and is compatible with MD, DVD, MP3, and multi-format digital signals in hard disks. Edited according to program requirements Complete high-quality broadcasts.
 
2.3.4 Remote speaker, addressable point-to-point broadcast: Using the most advanced digital coding at present, the remote speaker automatically switches on and off to ensure accuracy. 128-zone (area) speakers can be automatically addressed to point broadcast (expandable to countless zones). The receiving end requires no manual operation and has a strong audience.
 
2.3.5 Unlimited capacity expansion: Within the effective range covered by FM signals, countless FM receiving speakers can be used.
 
2.4 Equipment list

Product Name

Model

Function introduction

Number

Broadcasting room equipment

Audio server

HM-8000

Touch screen operation display, industrial chassis design, solid structure, with high efficiency of dust-proof, antimagnetic and impact force.

1

Intelligent broadcast control timing system

HM-W800

Play music regularly, ring the bell, realize unattended.Point to point zone control.

1

FM transmitter 50W)

HM-W650A

All solid state, frequency synthesis, large screen display, with microphone, line input, transmission distance 2-3km (for signal transmission)

1

Common multiple access coding controller

HM-W64

Addressable remote control coding technology, continuous code sending, ensuring the stability and reliability of the receiver's switch, and controlling the switch of the speaker in each area at will

1

One for two wireless microphone

HM-U100

100M handheld wireless microphone

1

Broadcast microphone

HM-MI2S

Chime tone

1

Stereo dual holder

HM-KZ32

Engineering type

1

Mixer

HM-1002

10Road mixer

1

DVD player

HM-CD32

Engineering type

1

Playground, canteen and dormitory broadcasting equipment

360W FM transceiver

HM-W536

Microcomputer lock-in, with frequency synthesis code, address code, double lock frequency code, addressable.With remote control.With frequency display.Constant resistance and pressure output interface.

3

One for two wireless microphone

HM-U100

100M handheld wireless microphone

3

Wooden indoor speaker (constant pressure)

HM-423

Rated power (W) 30W
Input voltage (V) 70v-100v
Frequency response (Hz) 130hz-15khz

14

Outdoor waterproof sound column (constant pressure)

HM-C40

Rated power (W) 40W
Input voltage (V) 70v-100v
Frequency response (Hz) 140hz-15khz

4

Indoor and outdoor FM receiving terminal

Outdoor FM column

HM-529

Microcomputer lock-in, with frequency synthesis code, address code, double lock frequency code, addressable.With remote control.With frequency display.

30

Indoor FM speaker

HM-W523

Microcomputer lock-in, with frequency synthesis code, address code, double lock frequency code, addressable.With remote control.With frequency display.

75

Animal shaped lawn speaker

HM-K26

Microcomputer lock-in, with frequency synthesis code, address code, double lock frequency code, addressable.With remote control.With frequency display.

15

Speaker remote control

HM-W10

LCD display, set the parameters, frequency, volume and location of the terminal speaker.

1

Antenna feeder system

Transmitting antenna

WT-30

Gain ≥ 5dB, standing wave ratio ≤ 1.2, bandwidth 3MHz

1

Lightning arrester

 

Frequency range: dc-2500mhz, impedance 50 Ω, insertion loss < 0.2db.

1

50-7High frequency cable

 

Sys50-7 high frequency cable 20 meters

1

Antenna pole

 

6rice

1

 

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