There are hundreds of thousands call center workers wearing acoustic device. However, researches
and noise exposure measurements on the noise transmitted from acoustic devices have seldom been
performed due to the difficulty of measurement and to the absence of the measuring method in
Korea. The aim of this study is to set up management measures to protect hearing loss on the call
operator by acquiring measurement data of noise transmitted from the headset. Noise exposure measurements
of 17 operators were performed in 7 call centers and head and Torso simulator method in
compliance with the ISO standard 11904-2 was used for the measurement of noise transmitted from
the headset. Sound pressure levels(SPL) transmitted from the headset were 73.2~86 dB(A). The operator
exposed to the highest SPL set up his volume control at 9 which was the highest volume level.
The volume control level, adjustable from 1 to 9, could be identified 12 out of 17 operators and the
range of volume levels was 4.5~9. As a result of pearson correlation analysis, the correlation between
volume level and SPL transmitted from the headset showed high relation as significance at the
measure to limit the volume level below the noise exposure level, i.e. 85 dB(A), rather than to
carry out noise monitoring considering cost-effective aspect.