ASA S12.55-2012/Amd.1-2021/ISO 3745:2012/Amd 1:2017
Amendment 1 to American National Standard Acoustics - Determination of sound power levels of noise sources using sound pressure - Precision methods for anechoic and hemi-anechoic rooms
Amendment by American National Standards of the Acoustical Society of America, 09/01/2021
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The performance of an anechoic or hemi-anechoic room is tested by comparing the spatial decrease of sound pressure emitted from a test sound source with the decrease of sound pressure that would occur in an ideal free sound field. The evaluation of this performance is based on the procedures outlined in ISO 26101.
