Sichuan monitoring installation company tells you that the public broadcasting system can be divided into the following categories according to the transmission and signal processing methods:
The analog power signal is transmitted to the terminal speaker through the audio cable. The power amplifier to the speaker in the computer room is transmitted at a high level, generally 100V or 70V. Its advantages are less line loss and convenient load connection. The speaker of the transformer can be connected in parallel to the line.
The real meaning of digital addressable public address system is that its audio signal, control signal and communication are all carried out in the digital domain. It has a longer transmission distance and better transmission effect, especially the audio signal and control signal are concentrated in one line. Transmission on a twisted pair of cores.
Regarding the classification of public broadcasting, in addition to what Sichuan Monitoring and Installation Company told you above, there are actually many, so do you not know anything after reading it?