Objective Measurement of the Attenuation of Hearing Protectors of the Circumaural Type.

摘要

Measurements have been made of the attenuation of five circumaural hearing protectors using dummy heads of three different designs. Results illustrate the variability on repeated attachment of the protectors to the dummy heads, and the effect of geometrical factors in the design of the latter. The results are also compared with the subjective calibration of the same five earmuffs carried out previously under directly comparable conditions. Attenuation measured on the dummy heads was consistently greater than that found subjectively, but was highly correlated to it at frequencies up to 2 kHz. This correlation is used to demonstrate that results in good agreement with subjective values may be predictable from objective measurements in simple test conditions.