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ASTM E3492-25
Standard Practice for Commonly Referenced Acoustical Calculation Procedures
Standard Practice for Commonly Referenced Acoustical Calculation Procedures
E3492-25
ASTM|E3492-25|en-US
Standard Practice for Commonly Referenced Acoustical Calculation Procedures
Standard
E3492 Standard Practice for Commonly Referenced Acoustical Calculation Procedures>
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BOS Vol. 04.06 Committee E33
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ASTM International
Significance and Use
5.1 The general approach to adjusting measurements for the presence of background noise is to subtract the background noise from the average level measurement, leaving only the adjusted average level. The procedure is to make two otherwise identical measurements in any order, and then calculate the adjusted average level from the two measurements. One of the measurement conditions is with the acoustic signal of interest present, in combination with the background noise. The other measurement condition is without the acoustic signal of interest, so it is only a measurement of the background noise.
5.2 The intent is to characterize identical conditions in both measurements with respect to the background noise, the only difference being the presence or absence of the acoustic signal of interest. To the extent possible all conditions should match between the two measurements, including the presence of all sources which contribute to the background noise, as well as matching the microphone positions or traverse paths and matching the instrument settings.
Scope
1.1 This practice is intended to be a compendium of commonly referenced calculations used in completing acoustical measurements in accordance with ASTM standards and guides.
1.1.1 The practice in its current iteration includes only the procedure for the calculation of adjusted average level based on measured background noise level.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.