ASA S3/SC1.100-2014 / S12.100-2014 American National Standard Methods to Define and Measure the Residual Sound in Protected Natural and Quiet Residential Areas
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This standard specifies measurement procedures for characterizing residual sound levels in protected natural areas and quiet residential areas. The standard specifies instrumentation, measurement durations, and statistical procedures for summarizing the data. A filtering procedure is provided that can be applied to A-weighted data to exclude high frequency sound energy where appropriate or warranted. The statistical procedure for calculating exceedance values like L90 is specified.