Noise (acoustic) 3338743 221213525 2008-06-23T15:20:42Z Shaliya waya 5283838 see also '''Acoustic noise''', is any sound in the acoustic domain, both wanted (music, bird song, amplified speech, etc) and unwanted. Unwanted noise includes noise pollution in an otherwise quiet environment, unwanted noise on audio systems, appliance noise, factory noise, crowd noise and so on. It is important to recognise that the term "noise" is also used to refer to other, non-audible forms, especially in [[electronics]] and in the radio/radar spectrum. ==Environmental noise== {{main|Noise pollution}} [[Environmental noise]] is the comprehensive study of acoustic phenomena in the human environment which involve unwanted sound. The principal sources of environmental noise are surface motor vehicles, aircraft, trains and industrial sources. These noise sources expose millions of people to [[noise pollution]] that creates not only annoyance, but also significant health consequences such as elevated incidence of hearing loss and cardiovascular disease. There are a variety of mitigation strategies and controls available to reduce sound levels including source intensity reduction, land use planning strategies, [[noise barrier]]s and [[sound baffle]]s, time of day use regimens, vehicle operational controls and [[architectural acoustics]] design measures. ==Laws governing noise== {{main|Noise regulation}} [[Environmental noise]] is governed by laws and standards which set maximum recommended levels of noise for specific land uses, such as residential areas, areas of outstanding natural beauty, or schools. These standards usually specify measurement using a [[weighting filter]], most often [[A-weighting]]. ==See also== *[[Loud music]] ==External links== *[http://www.defra.gov.uk/environment/noise/research/climate/nannexb.htm European noise laws] *[http://www.daniel-alberts.info/Papers/AddressingWindTurbineNoise.pdf Addressing Wind Turbine Noise] *[http://www.nonoise.org/ Noise Pollution Clearing House] [[Category:Noise pollution|Noise (acoustic)]] [[de:Geräusch]]