【 Weak current College 】 commonly used functions of the public broadcasting system and application---Power By 【 China power house network 】

Public broadcasting system called PA system (PublicAddress) widely used in stations, airports, hotels, commercial buildings, hospitals and various buildings provide background music and radio program over the past few years the public broadcasting system also serves as an emergency broadcast. Its main purpose is business advocacy, events and policies for radio, broadcast background music and radio public paging, fire and emergency incidents.

Today's public broadcasting set to play background music, broadcast propaganda, paging and fire emergency broadcast. This is a versatile strong broadcasting system, the general public broadcasting system must have the following features and technical requirements:

1. play background music and playing paging

Background music, hereinafter referred to as BGM (BackGroundMusic), its role is to cover the environmental noise in public places, creating a relaxed atmosphere. Background music in the average sound pressure at a 70db around 60 to.

In the background music playing paging broadcast, should have a back door or bells sound, to draw public attention.

2, emergency broadcasting

Past the emergency broadcast system and fire alarm system, as an independent system, but later found that the emergency broadcast system for long-term reliability without the often big problem usually test without problems, but when used in officially became a mute, so now the fire alarm system and background music system integrated with the composition of the versatility of a strong public broadcasting system.

3. priority broadcasting rights features

Fire, fire broadcast signal has the highest priority broadcasting rights, namely, the use of fire broadcast signal can automatically break background music and paging someone, etc.

4. selection broadcast function

When building a fire alarm, in order to prevent confusion, only to the fire zone and its adjacent regional broadcasting, withdrawal and the Organization for help command. This selection features should have automatic selection and two artificial selection, to ensure reliable implementation of the directive.

5. mandatory switching

Play background music when the speaker load input status usually differ, there is little volume status. There is off, but in the emergency broadcast, the speaker input status will become the most complete volume, volume by remote control instructions in force switch.

6, fire room must have an emergency broadcast console, this division controller should be able to remote control the public broadcasting system power on, power off. In the console to play with the microphone, the right of priority with strong switch right and selections broadcast rights.

Application of the public broadcasting system

1. campus public broadcasting system

Campus broadcasting system is currently using more widely and a broadcast system, campus broadcasting as school information dissemination of a tool that has gone through decades of history, with the development of science and technology, from the tube to the integrated circuit, from the phonograph to CD, experienced a few revolutions, but its equipment technical standards and grades of jagged, essentially to constant pressure amplifier plus Terminal speaker or loudspeaker, signal audio signal transmission mode of work, work in actual use and there are many shortcomings. Over the last few years FM technology in campus radio continues to mature, its relative to traditional broadcast methods have incomparable advantages, its functions are continuously improved, has gradually replacing traditional broadcasting and the current campus radio's major implementations.

The new campus radio system for various peripheral devices (such as tape recorder, CD, MD, your turn and digital audio hard disk, etc.) to intelligently centralized management and control, in accordance with the requirements of the school on program content, program length, edit it, dial-out hours be set in advance, PC watch computer can automatically manage the whole process of broadcasting, according to the settings of the program, make sure that the automatic broadcast program integrity, accuracy, timeliness of thereby eliminate the phenomenon without interrupting broadcasting. On the school routine radio programmes, such as up exercises, songs, music, can realize the Bell broadcast unattended. System with very high reliability, low noise transmission network signals, the system matches without power in the network and voltage matching requirements, single speaker fault does not affect the entire system, the complete machine in no signal is automatically turned off. To be a start signal or power-on instructions received after speakers automatically turn on. Achieve unattended.

2. hotel, hotel public broadcasting system

For a hotel, hotel public broadcasting system, room broadcast system is essential. Room broadcast system usually sets the multicast signals for guests choose to listen to, star hotel, hotel rooms broadcasting system at least 2 set of broadcast signals, more then 4 set of broadcast signals. Achieve virtually broadcast room are the following:

(1), in the room, by a power amplifier a broadcast signal, multi-core cables transmit multiple broadcast signals; in the end, guests through room bedside Control Panel select listen to broadcasts.

(2), in the room, several sets of broadcast signals through multiple RF modulator hybrid amplifier, use an RF cable for signal transmission; in the end, guest rooms bedside Control Panel through the internal FM receiver choose to listen to broadcasts.

(3), in the room, several sets of broadcast signals through multiple RF modulator mixed zoom, integrated into the cable TV extra channels, and cable TV signal to the signal transmission; in the end, guests choose to listen to by television broadcasts. 4, in the room, several sets of broadcast signals through multiple RF modulator hybrid amplifier, preset code, use an RF cable for signal transmission; in the end, guest rooms bedside Control Panel through the internal FM receiver choose address code to listen to broadcasts.

3. the hospital public broadcasting system

Hospital broadcasting system has a very large audience, influence a lot of information, education and entertainmentMusic stage, how to effectively manage and efficient application is a need to solve the problem. General Hospital-level broadcast to have specialized staff on duty management devices and broadcast work as well as outdoor line maintenance, the workload is very big, but also not easy to the competent Department.

The modern hospital broadcasting on the broadcast of various regions, at different times, you may need to broadcast different programmes, each broadcast program source of uniform and reasonable management, etc., all have different levels of demand. For example, in a different area, room or bed broadcast different programmes (health care knowledge) and individuals want to listen to different programmes can be broadcast control as needed.

4. Metro public broadcasting system

Metro radio system is Metro communications system in a specific subsystem, in the subway trains, passenger services, disaster recovery, equipment maintenance, and so have a very important role. Usually in different areas of the Metro stations for ticket sales, ticket, get in, waiting, and stopping, outbound, transfer and other broadcast different service terms and related considerations, to provide various services, maintaining the station order, effectively passengers, travelling after first, shorten the time to train stops to ensure that train, created the conditions, as the station staff provide other job; in Depot yard, tunnels and other underground workplaces interval for dispatching, yard shunting, vehicle testing, equipment maintenance, line maintenance, electricity power failure, equipment of rail sent sent off, with safety tips and advise, and other broadcasting services; in the event of major events, meetings, competitions, festivals, etc. caused by mutation in the subway passenger flows, as implementing emergency important means of passenger transport organizations, to ensure that the largest passenger operations organization and guarantees the safety of passengers; when accident hazards, and other emergencies, emergency relief, directing relief of important tools. For subway passenger transport, travelling, disaster prevention, equipment maintenance, and other departments to provide full-featured advanced job tool that improves the quality of subway passenger services and the ability to handle emergencies.
5. the major shopping malls, supermarkets, public broadcasting system

In General, major shopping malls, supermarkets, public broadcasting system has the function of the fire emergency broadcast system. Under normal circumstances, the public broadcasting system in addition to play background music, broadcast, soundtrack broadcast notification systems feature, when it encounters a fire alarm, the scene of the regional implementation manual selection for emergency broadcast.

Major shopping malls, supermarkets, public broadcasting system, the source is typically set three: CD player, dual-card recording and broadcast receiver. CD-selects multiple disc CD player, advance into more than one CD, all the tracks available for advance loop play background music. Recording, select double card recording, dual SIM card, you can cycle to work, play background music cassette tapes, you can also notice the temporary recording for broadcasting.

Radio microphone selection of desktop Gooseneck microphone, convenient operation, the built-in clock generator and speak the former may make crisp Bell, to remind the audience attention, primarily for broadcast use.

Many large shopping centres, supermarkets for one-story building, in accordance with the requirements of China fire system specification, its internal zone must be set up multiple fire shutter, designed the large shopping malls, supermarkets, public broadcasting system, it must comply with the relevant provisions of the internal fire zone broadcast partition.