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2. Public address system - Wikipedia

   en.wikipedia.org/wiki/Public_address_system

   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.

3. Integrated Public Alert and Warning System - Wikipedia

   en.wikipedia.org/wiki/Integrated_Public_Alert...

   The Integrated Public Alert and Warning System (IPAWS) is an architecture that unifies the United States' Emergency Alert System, National Warning System, Wireless Emergency Alerts, and NOAA Weather Radio, under a single platform. IPAWS was designed to modernize these systems by enabling alerts to be aggregated over a network and distributed to ...

4. Emergency communication system - Wikipedia

   en.wikipedia.org/wiki/Emergency_Communication_System

   Audio Public Address Systems Audio public address speakers A system which can provide audio (usually spoken language) messaging capability, usually consisting of microphone devices, wiring, and speakers installed in public areas of buildings. These systems are typically located indoors or in smaller outdoor areas with multiple speakers, due to ...

5. Federal Signal Corporation - Wikipedia

   en.wikipedia.org/wiki/Federal_Signal_Corporation

   Federal Signal Safety and Security Systems Group manufactures campus alerting systems, emergency vehicle lighting, emergency sirens, alarm systems, outdoor warning sirens, and public address systems. Currently, the company has 14 manufacturing facilities in 5 different countries. [1]

6. Wi-Fi positioning system - Wikipedia

   en.wikipedia.org/wiki/Wi-Fi_positioning_system

   Wi-Fi positioning system (WPS, WiPS or WFPS) is a geolocation system that uses the characteristics of nearby Wi‑Fi access points to discover where a device is located. [1]It is used where satellite navigation such as GPS is inadequate due to various causes including multipath and signal blockage indoors, or where acquiring a satellite fix would take too long. [2]

7. Distributed antenna system - Wikipedia

   en.wikipedia.org/wiki/Distributed_antenna_system

   Ohio: The Public Utilities Commission of Ohio has issued a pole attachment rulings which require the utility to allow Distributed Antenna Systems in the utility right-of-way in August 2014. New York: In the aftermath of the 9/11 attacks on the World Trade Center in New York, all public safety agencies understood the importance of radio systems ...