Public broadcasting is a broadcasting service for the public in a certain area. It is used to publish all kinds of news and internal information transmission, publish work signals, provide background music, and be used to call and forcibly insert emergency broadcasts of disaster accidents. It is also urban and rural. And an indispensable part of various public places in modern cities.
The scope of public broadcasting applications can be roughly divided into four categories:
1. Broadcasting system for public areas such as shopping malls, stations, docks, shopping malls, corridors, teachers and parking lots. This system is mainly used for voice broadcasting, so clarity is of primary importance. Moreover, this system often broadcasts background music at ordinary times, and it can be converted to emergency broadcast in the event of a disaster or emergency.
2. Hotel guest room broadcasting system. This system includes guest room audio broadcasting and emergency broadcasting. It is often broadcast by the bedside table in the guest room. The guest room broadcasting contains multiple freely selectable bands. During emergency broadcasting, the guest room broadcasting is automatically interrupted. , Automatically switch to emergency broadcast.
3. Hall sound reinforcement system refers to the broadcasting system in auditoriums, theaters, gymnasiums and other places. The broadcasting system in these places requires a highly professional sound reinforcement system, which not only needs to consider electro-acoustic technical issues, but also involves architectural acoustics. Both must be balanced, and must not be discarded. This type of broadcast system often has comprehensive and multi-purpose requirements. It is not only available for venue language sound reinforcement, but also often used in cultural performances. For large-scale live performance sound systems, the electric power is low. Tens of thousands of tens of thousands of watts. Therefore, high-power speakers and power amplifiers must be used. There are certain requirements in system configuration and equipment selection. At the same time, attention should be paid to the load of power lines.
4. Broadcasting and sound systems for conference rooms and lecture halls. Such systems are generally set up as both background music and emergency broadcast systems provided by public broadcasting. However, due to their special characteristics, conference broadcasts are often set up separately in conference rooms and lecture halls. system. For more demanding or international conference halls, special audiovisual systems such as simultaneous interpretation systems, conference voting systems, and large-screen projection TVs need to be designed separately.
The functions of the public address system can be divided into three types:
1. Business Broadcasting System
Office buildings, commercial office buildings, schools, hospitals, railway passenger stations, airports, stations, banks, factories and other buildings have set up operational broadcasts to meet the business and administrative management-based business broadcast requirements.
2. Service Broadcast System
Service broadcasts are set up in hotels, inns, shopping mall entertainment facilities and large public event venues. The scope of service broadcasting is background music and guest room program broadcasting, the purpose is to provide people with enjoyable music broadcasting programs, with service as the main purpose. 4 sets of service radio programs such as hotels are generally selected. The broadcast program content arrangement should be determined according to the service target and engineering level.
3. Fire accident broadcasting system
It is mainly used for emergency notification and evacuation guidance in case of fire or accident.
The function of installing the broadcasting system in general places is not single. After all, the application opportunities of fire accidents are relatively few, but they are indispensable functions. While the business broadcasting system and the service broadcasting system play their own role, they can also play the role of emergency diffusion management at any time.
The public broadcasting system should pay attention to:
1. Conditions of use
Pay special attention to the following: avoid using the machine in extremely low or high temperature environments, and avoid direct sunlight on the surface of the machine; avoid using the machine in a humid environment to avoid premature failure or premature components in the machine Rusting; before use, make sure that the local power supply voltage is consistent with the unit.
2. Use environment
Avoid using the machine in dust and vibration environments; there should be enough clearance around the machine to facilitate the heat dissipation of the machine; for the power amplifier, special attention should be paid to keep the heat dissipation channel clear.
3. Instructions
In the process of use, attention should be paid to the sequence of starting up and shutting down. When turning on the power, you should first turn on the front-end equipment such as the audio source, and then turn on the power amplifier; when turning off, you should turn off the power amplifier first, and then turn off the front-end equipment such as the audio source. If the audio equipment has a volume knob, turn the volume knob to the minimum before turning it on and off. The purpose of this is to alleviate the impact on the speaker when it is turned on and off.
It is strictly forbidden to pull out and insert the signal plug with power on. In order to avoid damage to the machine or sound box caused by the electric shock; if an abnormality occurs during the work of the machine, the power supply should be turned off immediately and stopped. If the operator does not understand the maintenance technology, do not open the machine without authorization, so as not to cause the machine to suffer greater damage. Damage or cause electric shock.
4. Maintenance work
Do not use volatile solutions to clean the machine. For example, wipe the surface of the machine with gasoline, alcohol, etc., and use a soft cloth to wipe the dust. Also, unplug the power supply when cleaning the casing of the machine. The machine is generally not waterproof. In case of wet water, the machine can be turned on only after the water is completely dry; do not place heavy objects on the machine to avoid deformation of the machine.
In our lives, we will obtain various major security issues in various places from various aspects. As long as we notice the elimination of hidden safety hazards in the process of use, we will let public broadcasting play its greater role. Practical value. Because security issues are no small matter, ensuring national security is an important prerequisite for doing everything well.
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