A fire alarm system has a number of devices working together to detect and warn people through visual and audio appliances when smoke, fire, carbon monoxide or other emergencies are present. These alarms may be activated automatically from smoke detectors, and heat detectors or may also be activated via manual fire alarm activation devices such as manual call points or pull stations. Alarms can be either motorized bells or wall mountable sounders or horns. They can also be speaker strobes which sound an alarm, followed by a voice evacuation message which warns people inside the building not to use the elevators.
Automatic or Manual
Fire Alarm Systems
Automatic fire alarm systems are activated through fire detectors, such as smoke or heat sensors. Manual fire alarms are activated with manual call points or pull stations. There is no reason for a fire alarm system to exclude one or the other. Both can be included in the same system.
Conventional fire alarms work as one unit and cannot pinpoint the exact area of activation unless inspected. Addressable fire alarms have a specially dedicated address for each fire alarm detector that is connected to the control panel, for easier identification of the source of the danger.
Fire Command Station
One-stage fire alarm systems warn everyone in the building that a sensor has been activated. Two-stage fire alarm systems warn only certain people who are authorized to take appropriate action before the second stage. This system is designed to serve large public areas (for example, healthcare facilities) to prevent panic and inadequate frightful response.
Public Address System PA
A public address system is an electronic system comprising microphones, amplifiers, loudspeakers, and related equipment. It increases the apparent volume (loudness) of a human voice, musical instrument, or other acoustic sound source or recorded sound or music. PA systems are used in any public venue that requires that an announcer, performer, etc. be sufficiently audible at a distance or over a large area. A PA system may include multiple microphones or other sound sources, a mixing console to combine and modify multiple sources, and multiple amplifiers and loudspeakers for louder volume or wider distribution.
Background music refers to a mode of musical performance in which the music is not intended to be a primary focus of potential listeners, but its content, character, and volume level are deliberately chosen to affect behavioral and emotional responses in humans such a concentration, relaxation, distraction, and excitement. Background music is commonly played where there is no audience at all, such as empty hallways and restrooms and fitting rooms. It is typically played at low volumes from multiple small speakers distributing the music across broad public spaces. The widespread use of background music in offices, restaurants, Malls etc.