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What is the public address system?


Broadcasting system is widely used in schools, shopping malls, hotels, parks and other public places of sound system, it can provide background music, emergency broadcasting and other functions for these places. A complete broadcasting system usually consists of the following parts:No matter what kind of broadcast sound system, it can be divided into four parts: program equipment, signal amplification processing equipment, transmission line and speaker system.

Sound source equipment: The sound source equipment is the starting point of the broadcasting system, which can produce sound signals. The sound source device includes a microphone, a recorder, a player, etc.

Transmission medium: Transmission medium is the transmission way of sound signal in broadcasting system. Common transmission media are cables, optical cables, radio waves and so on.

Modulator: A modulator is a device used to modulate a sound signal to a specific frequency. Common modulators are amplitude modulators, frequency modulators, etc.

Transmitter: A transmitter is a device that sends a modulated signal over the air. According to the different modulation methods, transmitters are also divided into AM transmitters and FM transmitters.

Receiver: A receiver is a device used to receive broadcast signals. Common receivers are radios, televisions, etc.

Speaker: A speaker is a device that converts a received broadcast signal into sound. According to different application scenarios, different types of speakers may be selected, such as indoor speakers, outdoor speakers, etc.

The above are several main components of the broadcasting system, which cooperate with each other to complete the functions of the broadcasting system. In practical applications, according to different needs and scenarios, the broadcast system may have more components and more complex designs. However, no matter how complex the system, the above parts are indispensable components of the broadcast system.

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