As everyone knows, with the change of people's living standards, public broadcasting systems have been widely used in hospitals, stations, airports, hotels, commercial buildings and various buildings to provide background music and radio programs. Let me introduce the functions of public broadcasting systems. And applications.
Today's public broadcasters integrate background music, publicity, paging broadcasts, and emergency broadcasts of fire accidents into one. This is a very versatile broadcasting system. This general public broadcasting system must have the following functions and technical requirements:
1.Play background music and play paging
Background music is abbreviated as BGM (Back Ground Music), and its role is to mask the environmental noise of public places and create a relaxed and happy atmosphere. The average sound pressure of background music is around 60 to 70db.
When the paging broadcast is played in the background music, there should be a reminder such as a jingle or a bell to remind the public.
2.Emergency broadcast
In the past, the emergency broadcast system was combined with the fire alarm system as an independent system. However, it was later found that the reliability of the emergency broadcast system has not become a problem for a long time. Usually it is no problem in normal tests, but it becomes dumb when it is officially used. Fire alarm systems and background music systems are now integrated to form a highly versatile public address system.
3. Priority broadcast right function
In the event of a fire, the fire broadcast signal has the highest priority broadcast right, that is, the use of the fire broadcast signal can automatically interrupt the background music and paging to find someone.
4.Selected area broadcast function
When a fire alarm occurs in the building, in order to prevent confusion, it only broadcasts to the fire and its adjacent areas, directs evacuation and organizes calls for help. This selection function should have automatic selection and manual selection to ensure reliable execution of instructions.
5.Forced switching function
The input state of each speaker load when playing background music is usually different, and some are in a low volume state. Some are turned off, but during emergency broadcasting, the input state of each speaker will be turned to the maximum full volume state, that is, the volume is forcibly switched by a remote control command.
6. The fire duty room must be equipped with an emergency broadcast console. This sub-control console should be able to remotely switch on and off the public broadcast system. The sub-console microphone has the priority to play right, and the sub-control has the right to switch strongly and broadcast the selection.
Application of public broadcasting system
1. Campus Public Broadcasting System
Campus broadcasting system is currently widely used and a broadcasting system. As a tool for school information transmission, campus broadcasting has gone through decades of history. With the development of science and technology, from electronic tubes to integrated circuits, from gramophones to CD has undergone several revolutions, but its equipment technology level and grades are uneven. Basically, it works with a constant-voltage power amplifier plus a terminal speaker or a tweeter, and a single audio signal transmission method. It exists in actual use and work. With many disadvantages. With the continuous maturity of FM technology in campus broadcasting in recent years, it has incomparable advantages over traditional broadcasting methods, and its functions have been continuously improved. It has gradually replaced traditional broadcasting methods and has become the main implementation of current campus broadcasting. the way.
The new campus broadcast system can intelligently manage and control various peripherals (such as recorders, CDs, MDs, radios, digital audio hard disks, etc.), and can edit program content and program length according to the requirements of the school. The dial-out time is set in advance, and the PC on duty can automatically manage the entire process of broadcasting, and automatically broadcast according to the set procedure to ensure the integrity, accuracy and punctuality of the program, thereby preventing the phenomenon of uninterrupted broadcasting. The school's routine radio programs, such as radio gymnastics, songs, music ringing, etc. can be broadcast unattended. The system has very high reliability, the system transmission network has low signal noise, and there is no requirement for power matching and voltage matching in the system network. The failure of a single speaker does not affect the overall system operation, and the whole machine automatically shuts down when there is no signal. The speaker will automatically turn on after a start signal or a start command is received. Achieve unattended.
2. Hotel, hotel public broadcasting system
For a hotel, hotel public broadcasting system, guest room broadcasting system is essential. Guest room broadcast systems usually require multiple broadcast signals for guests to choose to listen to. For star-rated hotels and hotel guest room broadcast systems, there are as few as two sets of broadcast signals and as many as four sets of broadcast signals. There are several ways to implement guest room broadcasting:
1) In the computer room, a set of broadcast program signals is amplified by a power amplifier, and multiple sets of broadcast signal are transmitted by the multi-core cable; at the terminal, the guest chooses to listen to the broadcast program through the control panel of the bedside table in the guest room.
2) In the computer room, multiple sets of radio program signals are mixed and amplified by multiple radio frequency modulators, and a radio frequency cable is used for signal transmission. At the terminal, the guest chooses to listen to the radio program through the FM receiver built in the control panel of the bedside table in the guest room.
3) In the computer room, multiple sets of broadcast program signals are mixed and amplified by multiple radio frequency modulators, merged into the extra channels of the cable TV, and transmitted with the cable of the cable TV; at the terminal, the guest chooses to listen to the broadcast programs through the TV. In the computer room, multiple sets of broadcast program signals are mixed and amplified through multiple RF modulators, the address code is preset, and a radio frequency cable is used for signal transmission. At the terminal, the guest selects the address code through the FM receiver built in the control panel of the bedside table in the guest room. Listen to radio programs.
3. Hospital public broadcasting system
The hospital's broadcasting system has a large audience, which has a large impact on the stage of publicity, education and entertainment. How to effectively manage and effectively apply it is a problem that needs to be solved. Generally, hospital-level broadcasts require dedicated personnel to manage the equipment and broadcast work, as well as the maintenance of outdoor lines. The workload is very large, and it is not convenient for the unified management of superior authorities.
Modern hospital broadcasts may require different programs to be broadcast in different areas of the broadcast network at different times. The unified production and reasonable management of the broadcast network program sources have different levels of requirements. For example, broadcasting different programs (health care common sense) in different wards, rooms or beds, and individuals who want to listen to different programs, can be individually broadcasted and controlled as needed.
4. Subway public broadcasting system
The subway broadcast system is a special subsystem in the subway communication system. It plays a very important role in subway traffic organization, passenger service, disaster prevention and rescue, and equipment maintenance. In different areas of subway stations, they usually broadcast different service terms and related notices for ticket sales, ticket checking, pit stop, waiting, boarding, exit, transfer, etc. In order to provide various services, maintain station order and effectively guide passengers, The train gets on and off in succession, shortening the stop time of the train station, ensuring the punctuality of the train, creating conditions, and providing other job broadcasts for station staff; at the same time, it is used for dispatching and commanding and depot shunting at subway stations such as vehicle depots and tunnel sections. , Vehicle commissioning, equipment maintenance, line maintenance, power supply rail power outage, equipment power outage, etc. to provide safety prompts and notifications and other broadcast services; when major events, assemblies, events, festivals, etc. cause sudden changes in subway passenger flow, as an emergency The important means of passenger transport organization is to ensure the safety of large passenger flow operation organizations and passengers; when an emergency such as an accident or disaster occurs, it is an important tool for emergency guidance and disaster relief. It provides advanced functional tools for subway passenger transportation, traffic, disaster prevention, equipment maintenance and other departments to improve the quality of subway passenger transportation services and the ability to handle emergencies.
5. Public broadcasting system for large shopping malls and supermarkets
In general, the public address system of large shopping malls and supermarkets should also have the function of a fire emergency broadcast system. Under normal circumstances, in addition to the background music broadcasting system functions such as playing background music and broadcast notifications, the public address system can implement manual selection of the emergency area for emergency broadcasts when encountering fire alarms.
In public broadcasting systems of large shopping malls and supermarkets, there are usually three program sources: a CD player, a dual-card recording stand, and a broadcasting microphone. The CD player uses a multi-disc CD player, and multiple CDs are placed in advance, and all tracks can be played in advance for background music. The recording stand uses a dual-card recording stand. The dual-card can work in a loop, play background music tapes, and can also be used for temporary notification of broadcast notifications.
The broadcasting microphone is a desktop gooseneck microphone, which is easy to operate and has a built-in bell generator. It can emit crisp bells before speaking to remind the audience to pay attention. It is mainly used for broadcast notification.
Many large shopping malls and supermarkets are single-story buildings. According to the requirements of China's fire protection system regulations, multiple fire shutter doors must be set up in the internal area. When designing public broadcasting systems for large shopping malls and supermarkets, they must also follow the relevant regulations to perform broadcasting partitions according to the internal fire prevention areas .
Wuxi Xianglongxin ventilation equipment Factory , https://www.xlx-fan.com