ASA S12.8-1998
METHODS FOR DETERMINING THE INSERTION LOSS OF OUTDOOR NOISE BARRIERS

Standard No.
ASA S12.8-1998
Release Date
1998
Published By
Acoustical Society of America (ASA)
Latest
ASA S12.8-1998
Scope
1.1 This Standard adopts insertion loss—the difference between acoustical levels before and after a noise-barrier installation—as the basis for evaluating the acoustical effectiveness of an outdoor noise barrier. Methods are provided to determine the insertion loss of outdoor noise barriers at selected receiver locations and under conditions of interest. 1.2 This Standard covers insertion loss determination, by measurement or by the combination of measurement and prediction, for outdoor noise barriers of all types. Sound sources at a site may be those that are naturally present, controlled natural sound sources, or controlled artificial sound sources. Preferred acoustical descriptors are time-average, A-weighted sound level, Aweighted sound exposure level, or octave-band sound pressure level. Other acoustical descriptors of the BEFORE and AFTER sound are not precluded. 1.3 Standardized receiver locations or measurement conditions are not prescribed. Measured insertion losses apply only for the stated conditions and are not to be generalized to represent other conditions, sites, receiver locations, or sound sources. 1.4 This Standard may be used for routine checking of the insertion loss of an outdoor noise barrier, or for engineering or diagnostic evaluations. The methods of the Standard may be used in situations where a barrier is to be installed, or has already been installed. 1.5 This Standard does not present methods for comparing the insertion loss of outdoor noise barriers at different sites, nor does it specifically address sound transmission loss through a barrier. While comparisons of the insertion loss of outdoor noise barriers at different sites or extrapolations to other conditions may be possible, such comparisons or extrapolations are not within the scope of this Standard. 1.6 Reliable and repeatable results may be expected when the distances between all receivers and their closest and strongest sound sources (or closest point of approach for mobile sound sources) are within 70 m. The methods of the Standard may be applied for other conditions, but the experimental uncertainties likely will increase, perhaps substantially. 1.7 This Standard presents two methods for indirectly determining the level of the BEFORE sound. The two methods are (1) by measurement at a second site that is equivalent to the desired site prior to installation of the barrier, or (2) by prediction of the BEFORE sound levels. Equivalence here is in terms of sound-source characteristics, receiver locations, and terrain, atmospheric, and ground conditions. The Standard presents principles, not procedures, for assessing soundsource, atmospheric and terrain equivalence, as well as for choosing a model to predict the level of BEFORE sound. 1.8 This Standard presents a method to determine a lower bound to the insertion loss when background noise prevents clear measurement of the source sound level at a receiver location. In many applications, reporting a barrier insertion loss for a given receiver location as ‘‘equal to or greater than X dB’’ is sufficient. This Standard also presents a method to determine the total experimental uncertainty associated with the barrier insertion loss. 1.9 Because of many factors affecting the sound levels at receiver locations, it may not be possible to determine the insertion loss of an outdoor noise barrier for conditions of interest.

ASA S12.8-1998 Referenced Document

  • ANSI S1.26-1995 Method for the Calculation of Absorption of Sound by the Atmosphere
  • ANSI S1.43-1997 Specifications for Integrating-Averaging Sound Level Meters

ASA S12.8-1998 history

  • 1998 ASA S12.8-1998 METHODS FOR DETERMINING THE INSERTION LOSS OF OUTDOOR NOISE BARRIERS

ASA S12.8-1998 -All Parts

ASA S12.1-1983 Guidelines for Preparation of Standard Procedures to Determine the Noise Emission from Sources ASA 49 ASA S12.10 PART 1-2010 American National Standard Acoustics - Measurement of Airborne Noise Emitted by Information Technology and Telecommunications Equipment - Part 1: Determination of Sound Power Level and Emission Sound Pressure Level ASA S12.10 PART 2-2011 American National Standard Acoustics - Measurement of Airborne Noise Emitted by Information Technology and Telecommunications Equipment - Part 2: Declaration of Noise Emission Levels ASA S12.10-2002 Acoustics ?Measurement of airborne noise emitted by information technology and telecommunications equipment ASA S12.11 PART 1-2013 American National Standard Acoustics - Measurement of airborne noise emitted and structure‐borne vibration induced by small air-moving devices - Part 1: Airborne noise measurement (a nationally adopted international standard) ASA S12.11 PART 2-2013 American National Standard Acoustics - Measurement of airborne noise emitted and structure-borne vibration induced by small air-moving devices - Part 2: Structure-borne vibration measurements (a nationally adopted international standard) ASA S12.12-1992 Engineering Method for the Determination of Sound Power Levels of Noise Sources Using Sound Intensity ASA S12.13 TR-2002 Evaluating the Effectiveness of Hearing Conservation Programs through Audiometric Data Base Analysis ASA S12.13-1991 (Obsolescent)Evaluating the Effectiveness of Hearing Conservation Programs Draft ASA 97 ASA S12.14-1992 Methods for the Field Measurement of the Sound Output of Audible Public Warning Devices Installed at Fixed Locations Outdoors ASA S12.15-1992 For Acoustics - Portable Electric Power Tools, Stationary and Fixed Electric Power Tools, and Gardening Appliances - Measurement of Sound Emitted ASA S12.16-1992 Guidelines for the Specification of Noise of New Machinery ASA 107 ASA S12.17-1996 Impulse Sound Propagation for Environmental Noise Assessment ASA S12.18-1994 Procedures for Outdoor Measurement of Sound Pressure Level ASA S12.19-1996 Measurement of Occupational Noise Exposure ASA S12.2-2019 American National Standard for Criteria for Evaluating Room Noise. ASA S12.23-1989 Method for the Designation of Sound Power Emitted by Machinery and Equipment ASA 83 ASA S12.3-1985 Statistical Methods for Determining and Verifying Stated Noise Emission Values of Machinery and Equipment ASA 57 ASA S12.30-1990 Guidelines for the Use of Sound Power Standards and for the Preparation of Noise Test Codes ASA 94 ASA S12.35-1990 Precision Methods for the Determination of Sound Power Levels of Noise Sources in Anechoic and Hemi-Anechoic Rooms ASA 90 R(2001) ASA S12.42-2010 American National Standard Methods for the Measurement of Insertion Loss of Hearing Protection Devices in Continuous or Impulsive Noise Using Microphone-in-Real-Ear or Acoustic Test Fixture Procedures ASA S12.43-1997 Methods for Measurement of Sound Emitted by Machinery and Equipment at Workstations and other Specified Positions ASA S12.44-1997 Methods for Calculation of Sound Emitted by Machinery and Equipment at Workstations and other Specified Positions from Sound Power Level ASA S12.5-2016 American National Standard Acoustics - Requirements for the performance and calibration of reference sound sources used for the determination of sound power levels (a nationally adopted international standard) ASA S12.50-2002 Acoustics ?Determination of sound power levels of noise sources ?Guidelines for the use of basic standards ASA S12.51-2012 American National Standard Acoustics - Determination of sound power levels and sound energy levels of noise sources using sound pressure - Precision methods for reverberation test rooms ASA S12.53 PART 1-2011 Acoustics - Determination of sound power levels and sound energy levels of noise sources using sound pressure - Engineering methods for small movable sources in reverberant fields - Part 1: Comparison method for a hard-walled test room ASA S12.53 PART 2-1999 American National Standard Acoustics - Determination of sound power levels of noise sources using sound pressure - Engineering methods for small, movable sources in reverberant fields - Part 2: Methods for special reverberation test rooms ASA S12.53/1-1999 Acoustics - Determination of Sound Power Levels of Noise Sources - Engineering Methods for Small, Movable Sources in Reverberant Fields - Part 1: Comparison Method for Hard-Walled Test Rooms ANSI S12.53/1-1999; ISO 3743-1: 1994 ASA S12.53/2-1999 Acoustics ?Determination of sound power levels of noise sources using sound pressure ?Engineering methods for small, movable sources in reverberant fields - Part 2: Methods for special reverberation test rooms ASA S12.54-1999 Acoustics - Determination of Sound Power Levels of Noise Sources Using Sound Pressure - Engineering Method in an Essentially Free Field over a Reflecting Plane Erratum; ANSI S12.54-1999; ISO 3744: 1994 [Replaced: ASA S12.34] ASA S12.55-2012 American National Standard Acoustics - Determination of sound power levels and sound energy levels of noise sources using sound pressure - Precision methods for anechoic rooms and hemi-anechoic rooms ASA S12.56-1999 Acoustics - Determination of Sound Power Levels of Noise Sources Using Sound Pressure - Survey Method Using an Enveloping Measurement Surface over a Reflecting Plane ANSI S12.56-1999; ISO 3746: 1995 [Replaced: ASA S12.36] ASA S12.57-2011 American National Standard Acoustics - Determination of sound power levels and sound energy levels of noise sources using sound pressure - Engineering/survey methods for use in situ in a reverberant environment ASA S12.58-2012 American National Standard Sound Power Level Determination for Sources Using a Single-source Position ASA S12.6-2016(R2020) American National Standard Methods for the Measuring the Real-Ear Attenuation of Hearing Protectors


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