Sound Attenuation means reducing the intensity or the pressure level of sound, which is transmitted from one point to another.
STC (Sound Transmission Class) is the ability of a barrier to stop sound from passing through it. A material with an STC of 21 will prevent 21 decibels of sound from passing through it. The most sound that can be expected to be blocked between open workstations is 21 decibels. This is because sound will bend over the top and around the sides of partial height partitions.
Normal Speech Privacy is where the Articulation Index (AI) is less than 0.20.
Confidential Speech Privacy is where the Articulation Index (AI) is less than 0.05.
Speech Privacy is measured by ASTM E-1130 and rated using an Articulation Index that classifies speech privacy levels as minimal, normal or confidential.
