Public broadcasting is a broadcast that serves the public in a certain area. It is used to publish various news and internal information transmissions, release work signals, provide background music, and use for calling and forcibly inserting accidental accidents. And an indispensable part of various public places in the modern city.
The scope of public address applications can be broadly divided into four categories:
1. Broadcasting systems in public areas such as shopping malls, stations, terminals, shopping malls, corridors, teachers and parking lots. This type of system is mainly used for voice broadcasting, so clarity is paramount. Moreover, such systems often broadcast background music in peacetime, and can be converted to emergency broadcasts in the event of a disaster or emergency.
Second, hotel room broadcasting system. Such systems include room audio broadcasts and emergency broadcasts, often delivered by bedside tables located in the guest rooms. The room broadcasts contain a number of freely selectable bands. In the case of emergency broadcasts, room broadcasts are automatically interrupted and automatically switched to emergency broadcasts.
Third, the hall sound reinforcement system. Refers to the broadcasting system of auditoriums, theaters, stadiums and other places. The broadcasting system in these places requires a professional sound reinforcement system, which not only considers electro-acoustic technology problems, but also involves architectural acoustics. Both of them must be balanced and should not be neglected. Such broadcast systems often have comprehensive multi-purpose requirements, which can be used not only for the sound reinforcement of the venue language, but also for cultural performances. For large live performance sound systems, less electric power. Then tens of thousands, more than hundreds of thousands of watts. Therefore, it is necessary to use high-powered speakers and power amplifiers, and there are certain requirements in system configuration and equipment selection, and attention should be paid to the load problem of power lines.
Fourth, conference room, lecture hall broadcast sound system. Such systems are generally also systems that are set up for background music and emergency broadcasts provided by public broadcasts, but because of their particularity, conference broadcast systems are often set up separately in conference rooms and lecture halls. For higher requirements or international conference halls, special audiovisual systems such as simultaneous interpretation systems, conference voting systems, and large-screen projection televisions are also required.
The functions of the public address system can be divided into three types:
1. Business broadcast system office buildings, commercial office buildings, schools, hospitals, railway passenger stations, airports, stations, banks and factories and other buildings set up business broadcasts to meet business and administrative management-based business broadcast requirements.
2. Service Broadcasting System Service broadcasting for hotels, hotels, shopping malls and entertainment facilities and large public events venues. The service broadcast range is background music and room program broadcasts, and the purpose is to provide people with an enjoyable music-like broadcast program with the main purpose of service. Four sets of service broadcasts such as hotels are generally selected. The content of the broadcast program should be arranged according to the service target and engineering level.
3. The fire accident broadcast system is mainly used for emergency notification and evacuation guidance in case of fire or accident.
The function of installing a broadcasting system in a general place is not single, and the application opportunity of a fire accident is less, but it is an indispensable function. While the commercial broadcast system and the service broadcast system play their own roles, they can also function as an emergency spread management at any time.
Note that public broadcasting systems should be used in use:
1. Special conditions should be paid attention to the following: Avoid using the machine in extremely low or high temperature environment, avoiding direct sunlight to the surface of the machine; avoid using the machine in a humid environment to avoid premature failure of the internal components. Or the machine rusts prematurely; you must confirm that the local power supply voltage matches the unit before use.
2, the use of the environment to avoid the use of the machine in dust and vibration environment; there should be enough space 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 for use In the process of use, should pay attention to the order of power on, shutdown. When starting up, you should first open the front device such as the sound source, and then turn on the power amplifier; when shutting down, you should turn off the power amplifier first, then turn off the front device such as the sound source. If the audio equipment has a volume knob, it is best to turn the volume knob to the minimum before turning it on and off. The purpose of this is to reduce the impact on the speaker when the phone is turned on or off.
Do not pull or plug the signal plug. In order to avoid damage to the machine or speaker caused by the electrical shock caused by this; if the machine is abnormal during operation, the power should be turned off immediately and the use should be stopped; if the operator does not understand the maintenance technology, he should not open the machine without authorization, so as not to cause the machine to suffer more. Damage, or cause an electric shock.
4, maintenance work Do not use volatile solutions to clean the machine, such as using gasoline, alcohol, etc. to wipe the surface of the machine, dusting with a soft cloth. Also, unplug the power supply when cleaning the machine casing. The machine is generally not waterproof. In case of wet water, it is necessary to wait until the water is dry before starting work; do not place heavy objects on the machine to avoid deformation of the machine.
In our lives, we will get all kinds of relatively large security aspects from various places. As long as we notice the elimination of security risks in the process of using, we will let public broadcasting play its bigger 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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