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A public address system (or PA 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.
Police can simply follow the signal emitted by the tracking system and locate the stolen vehicle. When used as a security system, a Vehicle Tracking System may serve as either an addition to or replacement for a traditional car alarm. Some vehicle tracking systems make it possible to control the vehicle remotely, including block doors or engine ...
The StarChase system, as of mid-2013 was in use by the Arizona Department of Public Safety, [5] Los Angeles Sheriff's Department, Austin Police Department, [6] and other agencies globally including the Ontario Provincial Police. [7] By early 2023, the company released a variation using a rifle platform called the 'Guardian-HX'.
CAD systems may be interconnected with automatic vehicle location systems, mobile data terminals, office telephones, and selective calling and push-to-talk ID.. Computer-assisted dispatch systems use one or more servers located in a central dispatch office, which communicate with computer terminals in a communications center or with mobile data terminals installed in vehicles.
The Dubai police use ANPR cameras to monitor vehicles in front and either side of the patrol car. A Merseyside Police car equipped with mobile ANPR During the 1990s, significant advances in technology took automatic number-plate recognition (ANPR) systems from limited expensive, hard to set up, fixed based applications to simple "point and ...
1980s MirTone intercom system. An intercom, also called an intercommunication device, intercommunicator, or interphone, is a stand-alone voice communications system for use within a building, small collection of buildings or portably within a small coverage area, which functions independently of the public telephone network. [1]
ITS graphical user interface displaying the Hungarian highway network and its data points. An intelligent transportation system (ITS) is an advanced application that aims to provide services relating to different modes of transport and traffic management and enable users to be better informed and make safer, more coordinated, and 'smarter' use of transport networks.
The most common way of facilitating public communications is by using devices that are incorporated into some public venue, such as public-address systems or digital signage. Using public devices for the purpose of public warning empowers people at risk to take actions to reduce losses from natural hazards, accidents, and acts of terrorism.