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An NYPD LRAD on top of a police humvee An LRAD operator wearing hearing protection LRAD on a navy ship. A long-range acoustic device (LRAD), acoustic hailing device (AHD) or sound cannon is a specialized loudspeaker that produces sound at high power for communicating at a distance.
A patent horn loudspeaker. Loudspeakers are often built into horn-shaped enclosures or use horns. Most often the higher-frequency elements (tweeters and midranges) use horns, sometimes with acoustic diffraction lenses to spread the sound waves in a horizontal pattern at ear-level and limit the vertical pattern. An audio driver (e.g., a speaker ...
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A horn loudspeaker is a loudspeaker or loudspeaker element which uses an acoustic horn to increase the overall efficiency of the driving element(s). A common form (right) consists of a compression driver which produces sound waves with a small metal diaphragm vibrated by an electromagnet, attached to a horn, a flaring duct to conduct the sound waves to the open air.
An air horn is a pneumatic device designed to create an extremely loud noise for signaling purposes. It usually consists of a source which produces compressed air, which passes into a horn through a reed or diaphragm. The stream of air causes the reed or diaphragm to vibrate, creating sound waves, then the horn amplifies the sound making it louder.
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Hughes Aircraft Company: AN/AAR-31: Infrared (IR) detection set for Anti-submarine warfare: Barnes Engineering AN/AAR-34: Infrared (IR) Tracking & Missile Warning System, replacing the AN/ALR-23: F-111 Aardvark: Cincinnati Electronics AN/AAR-37: Infrared (IR) Detector: P-3A/B Orion, EP-3E: Hughes Aircraft Company: AN/AAR-38: COMPASS COOL ...
Lethal Company is a cooperative video game for up to four players played in first-person perspective. Set in a retro-futuristic setting, players work as contracted employees of "The Company". They can communicate with each other through the in-game proximity chat , as well as proximity text chat.