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Community Response to High-Energy Impulsive Sounds An Assessment of the Field Since 1981 (1996) / Chapter Skim
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C Glossary
Pages 46-52

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From page 46...
... With no additional modifier, the words "sound exposure level" and its abbreviation "SEL" are usually understood to be A-weighted sound exposure level. This report makes such frequent reference to both A-weighted and C-weighted sound exposure levels that the abbreviations ASEL and CSEL are used throughout to minimize confusion.
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From page 47...
... Note: Night average sound level in decibels is related to the corresponding night sound exposure level, LEn, according to:
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From page 48...
... Note: Procedures for computing perceived noise level are stated in Federal Aviation Regulation Part 36, Noise Standards: Aircraft Type and Airworthiness Certification, Appendix B and in International Civil Aviation Organization Annex 16, Volume 1, Aircraft Noise, Third Edition, July 1993.
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From page 49...
... sound exposure level: Ten times the logarithm to the base ten of the ratio of a given time integral of squared instantaneous A-weighted sound pressure, over a stated time interval or event, to the product of the squared reference sound pressure of 20 micropascals and reference duration of 1 second. The frequency weighting and reference sound exposure may be otherwise if stated explicitly.
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From page 50...
... Initiation of the running time average from some time in the past is indicated by -A for the beginning of the integral. ANSI S 1.4-1983, American National Standard Specification for Sound Level Meters, gives standard frequency weightings A and C and standard exponential time weightings fast (F)
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From page 51...
... . time-average sound level; time-interval equivalent continuous sound level; time-interval equivalent continuous A-weighted sound pressure level; equivalent continuous sound level: Ten times the logarithm to the base ten of the ratio of time-mean-square instantaneous A-weighted sound pressure, during a stated time interval T
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From page 52...
... energy average: Colloquial term for time-mean-square average of the sound pressures for a series of sound signals. energy summation: Colloquial term loosely used to indicate addition of noncoherent sound signals by the sum of the squares of their sound pressures or the sum of their sound exposures.
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Key Terms

  • sound exposure
  • sound level
  • time interval
  • exposure level
  • reference sound

  • stated time
  • pressure level
  • sound pressures
  • ten times
  • peak sound

  • base ten
  • average sound
  • squared instantaneous
  • night sound
  • instantaneous sound

  • day sound
  • frequency weighting
  • equivalent continuous
  • specified time
  • sound signals

  • pressure signal
  • absolute instantaneous
  • squared sound
  • colloquial term
  • continuous sound

  • standard frequency
  • stated frequency
  • exponential time
  • instantaneous pressure
  • squared reference


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