Übersetzung und Analyse von Wörtern durch künstliche Intelligenz
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average effectiveness level - Übersetzung nach arabisch
average effectiveness level
 1973 (2149089991).jpg?width=200 "Measuring elevation with a line level. Historical archaeology at the old Champoeg townsite, Champoeg, Oregon (USA) 1973 (2149089991)")
![bull's eye spirit level]] mounted in a camera tripod](https://commons.wikimedia.org/wiki/Special:FilePath/Spirit Level 5E5W0843.jpg?width=200 "bull's eye spirit level]] mounted in a camera tripod")
Definition
Wikipedia
The day-night average sound level (Ldn or DNL) is the average noise level over a 24-hour period. The noise level measurements between the hours of 22:00 and 07:00 are artificially increased by 10 dB before averaging. This noise is weighted to take into account the decrease in community background noise of 10 dB during this period. There is a similar metric called day-evening-night average sound level (Lden or DENL) commonly used in other countries, or community noise exposure level (CNEL) used in California legislation; that is, the DNL with the addition of an evening period from 19:00 to 22:00 when noise level measurements are boosted 5 dB (or 4.77 dB in the case of CNEL) to account for the approximate decrease in background community noise during this period.
In the US, the Federal Aviation Administration has established this measure as a community noise exposure metric to aid airport noise analyses under Federal Aviation Regulation Part 150. The FAA says that a maximum day-night average sound level of higher than 65 dB is incompatible with residential communities. Communities in affected areas may be eligible for mitigation such as soundproofing.
