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ASA/ANSI S12.2-2019 (R2023)
Criteria for Evaluating Room Noise
This Standard provides three primary methods for evaluating room noise: a survey method that employs the A-weighted sound level; an engineering method that employs expanded noise criteria (NC) curves; and a method for evaluating low-frequency fluctuating noise using room noise criterion (RNC) curves.
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Acoustical Society of America [asa]