Ambient sound levels are often measured in order to map sound conditions over a spatial regime to understand their variation with locale.[2] In this case the product of the investigation is a sound level contour map.[3] Alternatively ambient noise levels may be measured to provide a reference point for analyzing an intrusive sound to a given environment. For example, sometimes aircraft noise is studied by measuring ambient sound without presence of any overflights, and then studying the noise addition by measurement or computer simulation of overflight events. Or roadway noise is measured as ambient sound, prior to introducing a hypothetical noise barrier intended to reduce that ambient noise level.
Ambient noise level is measured with a sound level meter.[4] It is usually measured in dB relative to a reference pressure of 0.00002 Pa, i.e., 20 μPa (micropascals) in SI units.[5] This is because 20 μPa is the faintest sound the human ear can detect.[5] A pascal is a newton per square meter. The centimeter-gram-second system of units, the reference sound pressure for measuring ambient noise level is 0.0002 dyn/cm2, or 0.00002 N/m2.[6] Most frequently ambient noise levels are measured using a frequency weighting filter, the most common being the A-weighting scale, such that resulting measurements are denoted dB(A), or decibels on the A-weighting scale.[4]
ambient, noise, level, atmospheric, sounding, noise, pollution, ambient, noise, level, sometimes, called, background, noise, level, reference, sound, level, room, noise, level, background, sound, pressure, level, given, location, normally, specified, reference. In atmospheric sounding and noise pollution ambient noise level sometimes called background noise level reference sound level or room noise level is the background sound pressure level at a given location normally specified as a reference level to study a new intrusive sound source 1 Integrating Sound Level Meter Ambient sound levels are often measured in order to map sound conditions over a spatial regime to understand their variation with locale 2 In this case the product of the investigation is a sound level contour map 3 Alternatively ambient noise levels may be measured to provide a reference point for analyzing an intrusive sound to a given environment For example sometimes aircraft noise is studied by measuring ambient sound without presence of any overflights and then studying the noise addition by measurement or computer simulation of overflight events Or roadway noise is measured as ambient sound prior to introducing a hypothetical noise barrier intended to reduce that ambient noise level Ambient noise level is measured with a sound level meter 4 It is usually measured in dB relative to a reference pressure of 0 00002 Pa i e 20 mPa micropascals in SI units 5 This is because 20 mPa is the faintest sound the human ear can detect 5 A pascal is a newton per square meter The centimeter gram second system of units the reference sound pressure for measuring ambient noise level is 0 0002 dyn cm2 or 0 00002 N m2 6 Most frequently ambient noise levels are measured using a frequency weighting filter the most common being the A weighting scale such that resulting measurements are denoted dB A or decibels on the A weighting scale 4 See also editA weighting Background noise Environmental noise Noise barrier Noise health effects Noise level in the sonar equation Noise pollution Noise regulationReferences edit Sound and Vibration Instrument Hire and Calibration Background Noise Measurement Gracey amp Associates Retrieved 22 October 2021 Jonah S A Baba Kutigi A N Uno U E Dangana M L Kolo M T Ofor N P Unuevho C I Abba F M Alhassan D U Amadi A N Umar M O Kimpa M I 2011 SPATIAL ANALYSIS AND GEOGRAPHICAL INFORMATION SYSTEM GIS MAPPING OF NOISE POLLUTION IN BOSSO LOCAL GOVERNMENT COUNCIL NIGER STATE NIGERIA Environmental Technology amp Science Journal SCHOOL OF ENVIRONMENTAL TECHNOLOGY FUT MINNA ISSN 2006 0459 Celik Cahit Tagi Guremen Lale 2008 Analytical Noise Contour Construction Using Inverse Square Law of Sound Propagation Environmental Engineering amp Management Journal 7 4 423 426 doi 10 30638 eemj 2008 061 a b What does dBA mean when someone talks about noise levels Nex Flow November 6 2018 Retrieved 22 October 2021 a b Decibels amp Pascals HeartAudio Retrieved 22 October 2021 PRESSURE Units Conversion micropascals to newton per square meter Justin Tools Retrieved 22 October 2021 nbsp This article incorporates public domain material from Federal Standard 1037C General Services Administration Archived from the original on 2022 01 22 in support of MIL STD 188 Further reading editAssessment of Ambient Noise Levels Retrieved from https en wikipedia org w index php title Ambient noise level amp oldid 1185159794, wikipedia, wiki, book, books, library,
