Do you know the classification and characteristics of public broadcasting?

According to the transmission and signal processing methods, public address system can be divided into the following categories:

1. Fold in the traditional way. The analog power signal is transmitted to the terminal speaker through the audio cable, and is transmitted to the speaker by the power amplifier in the machine room at a high level, which is generally 100V or 70 V. Its advantages are low line loss and convenient load connection, and it is only necessary to connect the speaker and the line in parallel with a step-down transformer.

2. Folding NC mode. In a real digital addressable public address system, the audio signal, control signal and communication are all carried out in the digital domain, and the transmission distance is longer and the transmission effect is better, especially the audio signal and control signal are concentrated on a twisted pair.