The public address system is an electrical sound amplification and distribution system. It can provide multiple function which can be:

Boarding announcements (for airports and railway station for example)

  • Individual calls
  • Employee notification
  • Safety and security calls
  • Background music into selected areas
  • Call to prayers

The public address system can also be used as a voice evacuation system, as seen in the Fire Detection System sub-chapter. This system will be a part of the high-end alarm system. It uses spoken messages to evacuate public facilities in orderly fashion during emergencies.