Articulation Class

A measure for rating the speech privacy performance of a ceiling in an open plan environment where sound is reflected off the ceiling between two adjacent spaces divided by partial-height furniture panels.

A high Articulation Class gives some speech privacy; a lower AC value means lower privacy. American acoustic consultants usually refer to suspended ceiling systems with minimum AC 180 in order to achieve some kind of acceptable speech privacy for normal working tasks.

Reference

ASTM E 1110 Standard specification for the determination of Articulation Class

ASTM E 1130 Standard test method for objective measurement of Speech Privacy in open offices using the Articulation Index

See also: Articulation Index, Ceiling Attenuation Class, Percentage Articulation Loss of Consonants.

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Subjects: Noise & Vibration