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.
American National Standard Electroacoustics - Simulators of human head and ear - Part 8: Acoustic coupler for high-frequency measurements of...
American National Standard for Measurement of Sound Pressure Levels in Airstandard by American National Standards of the Acoustical Society of...
American National Standard Quantities and Procedures for Description and Measurement of Environmental Sound - Part 4: Noise Assessment and Prediction...
Shaft alignment methodology, Part 3: alignment of vertically oriented rotating machinerystandard by American National Standards of the Acoustical Society of...