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False alarms may occur with residential burglary alarms, smoke detectors, industrial alarms, fire alarms and in signal detection theory. False alarms have the potential to divert emergency responders away from legitimate emergencies, which could ultimately lead to loss of life. In some cases, repeated false alarms in a certain area may cause ...
The false positive rate is calculated as the ratio between the number of negative events wrongly categorized as positive (false positives) and the total number of actual negative events (regardless of classification). The false positive rate (or "false alarm rate") usually refers to the expectancy of the false positive ratio.
However, in most fielded systems, unwanted clutter and interference sources mean that the noise level changes both spatially and temporally. In this case, a changing threshold can be used, where the threshold level is raised and lowered to maintain a constant probability of false alarm. This is known as constant false alarm rate (CFAR) detection.
An airline spokesperson said an indicator light was later confirmed to be false. An American Airlines jet made an emergency landing Sunday after the crew reported a "possible electric issue."
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The L.A. County Fire Department determined that a reported plane crash off Rancho Palos Verdes was a false alarm and ended their search around 6:30 p.m. Wednesday, authorities said.
In the case of fire alarms, aerosol sprays, smoking, or burning food can all lead to a false alarm. [5] Many avoid the risk of false alarms by ensuring their alarms are secured in an appropriate location, such as placing a smoke detector or fire alarm away from the kitchen where smoke from burned food or large quantities of steam which may ...
Francis Barlow's illustration of the fable, 1687. The Boy Who Cried Wolf is one of Aesop's Fables, numbered 210 in the Perry Index. [1] From it is derived the English idiom "to cry wolf", defined as "to give a false alarm" in Brewer's Dictionary of Phrase and Fable [2] and glossed by the Oxford English Dictionary as meaning to make false claims, with the result that subsequent true claims are ...