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A security alarm is a system designed to detect intrusions, such as unauthorized entry, into a building or other areas, such as a home or school. Security alarms protect against burglary or property damage, as well as against intruders. Examples include personal systems, neighborhood security alerts, car alarms, and prison alarms.
The Mosquito or Mosquito alarm is a machine used to deter loitering by emitting sound at high frequency. In some versions, it is intentionally tuned to be heard primarily by younger people. Nicknamed "Mosquito" for the buzzing sound it plays, the device is marketed as a safety and security tool for preventing youths from congregating in ...
It was the second in the BBC Sound Effects series to be credited to the Workshop. It featured sounds from popular television series Doctor Who (all from Season 18 ) and Blake's 7 , as well as effects for the first series of the radio versions of Douglas Adams ' The Hitchhiker's Guide to the Galaxy and James Follett 's Earthsearch .
The auditory warnings produced by these systems usually include a separate attention-getting sound, followed by one or more verbal commands to the pilot/crew. Perhaps the most widely known example, encountered in many video games and movies, is the "Pull up! Pull up!" command. Other common spoken warnings are "Terrain, terrain", "Windshear ...
They are widely used in electronic burglar-alarm systems. The detection process begins with a microphone that picks up noises and vibrations coming from the glass. If the vibrations exceed a certain threshold (which is sometimes user selectable), then they are analyzed by detector circuitry.
There are 8,200 alarm sirens for civil protection throughout Switzerland. They are tested once a year, on the first Wednesday in February. [1] Sound sample ⓘ An 1860s-era siren. [2] A siren is a loud noise-making device. There are two general types: mechanical and electronic.
A horn is a sound-making device installed on motor vehicles, trains, boats, and other types of vehicles. The sound it makes usually resembles a “honk” (older vehicles) or a “beep” (modern vehicles). The driver uses the horn to warn others of the vehicle's presence or approach, or to call attention to some hazard.
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