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What equipment is included in the composition of the public address system?


  What equipment is included in the composition of the public address system?Generally, a simple public broadcasting system is equipped with a power sequencer, audio source equipment, audio source processing equipment, broadcast power amplifier, broadcast partition, transmission line, speaker, etc.

Power sequencer: because of the public broadcasting and all sound reinforcement systems, the on-off sequence of the equipment is required. when the system is started, the sound source equipment-processor-power amplifier must be turned on first. When the machine is turned off, the order is reversed. If the machine is not turned on and off in the normal order, the power amplifier equipment will be damaged, and the sound of popping will be heard at the speaker end when the equipment is turned on.

Audio source equipment: mainly microphones, CD, DVD, MP3 and other players, radios, computers, public broadcasting servers and other equipment.

Audio source processing equipment: mainly preamplifiers, mixer, audio processors, etc., mainly used for audio source selection, audio signal processing, etc.

Power amplifier for broadcasting system: small public broadcasting system can use combined power amplifier, which is the integration of preamplifier and power amplifier, so that preamplifier and pure post-stage power amplifier can be used. digital ip broadcasting system is generally equipped with ip broadcasting adapter (with its own power amplifier). some of them only receive network broadcasting signals, and the back-end is equipped with pure post-stage power amplifier. this mainly depends on the reasonable selection of all speaker power under the partition.

Broadcast Partitioner: The main function of the broadcast partitioner is to control and manage the broadcast service area. The broadcast service area covered by the same broadcast system may be very large, including many functional areas, and these areas may need different broadcast states at the same time, so it is necessary to partition processing and control these areas with different functions. In the era of analog broadcasting, partitions are generally used. At present, partitions are used less in IP digital broadcasting.

Transmission line: IP broadcasting adapters in each area of IP digital broadcasting are connected to the general control room because network transmission is used, and network transmission lines, optical cables or network cables are used. Power amplifier to the speaker is generally the use of broadcast lines, usually 2 x 0.5-2 x 1 mm² multi-strand sheath line.

Speakers: outdoor sound column (generally used in outdoor places such as playgrounds), wall-mounted speakers, ceiling speakers, landscape speakers, etc. Power is 6W/10W/12W/20W, etc. In general schools, teachers use small wall-mounted speakers, and outdoor sound columns are used in playgrounds and outdoor places.

The traditional public broadcasting system consists of: sound source equipment-preamplifier-pure post-amplifier-partition-speaker.

Digital IP broadcasting is also used more now, which has greatly improved its advantages over traditional broadcasting. The following is a general introduction to digital IP broadcasting:

Digital IP broadcasting system: a public broadcasting system based on TCP/IP protocol, which digitally encodes the broadcast audio signal, sends it in the form of IP data packets through the network, and then decodes it by the terminal to restore the audio signal. It is called a digital IP network broadcasting system. All digital signal transmission, no attenuation, no interference, high fidelity. Relying on the IP network and Internet built by users, the coverage area is not limited. Identified by an IP address, the partition can be refined to each broadcast point. Change the broadcasting system from one-way broadcast to two-way interaction. Users can use the broadcasting system remotely through a computer. IP network broadcast will not completely replace the traditional broadcast, each product has its advantages of the occasion.

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