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Effects of Aircraft Noise: Research Update on Select Topics (2008) / Chapter Skim
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Glossary
Pages 25-27

The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
Select key terms on the right to highlight them within pages of the chapter.


From page 25...
... -- a computer software program used to analyze spatial data that can be especially useful in examining noise distribution over a geographic area. Ground absorption -- as sound propagates near the ground, ground absorption is the interaction of the sound wave with the ground that results in attenuation of the sound.
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From page 26...
... Noise-induced permanent threshold shift -- permanent hearing impairment occurring as a result of noise exposure, often phrased permanent threshold shift. Norepinephrine -- a hormone produced by the adrenal medulla similar in chemical and pharmacological properties to epinephrine, but chiefly a vasoconstrictor with little effect on cardiac output.
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From page 27...
... WECPNL (Weighted Equivalent Continuous Perceived Noise Level) -- is a noise metric commonly used in Japan, it is similar in concept to DNL, but uses a different algorithm to compute and includes an evening weighting similar to CNEL and Lden.
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Key Terms

  • sound pressure
  • noise level
  • equivalent sound
  • sound exposure
  • maximum noise

  • exposure level
  • average sound
  • reference sound
  • stated time
  • pressure level

  • time interval
  • stated frequency
  • integrated noise
  • noise exposure
  • sound wave

  • sound propagates
  • analyzing noise
  • aircraft noise
  • noise levels
  • federal committee

  • federal interagency
  • local time
  • propagates near
  • committee organized
  • temporary threshold

  • permanent threshold
  • interagency committee
  • camp grounds
  • impairment occurring
  • threshold shift


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