A research for efficiency of hearing protection device using a small acoustic filter

Abstract

A ready -made hearing protection device (HPD) is effective on preventing noise induced hearing loss (NIHS), but workers in noisy environment often resist to wear it. Because the ready -made products are uncomfortable and are hard to understand the others. To prevent hearing loss effectively it is important that workers keep wearing a HPD. So we proposed a made -to -order HPD in which a small acoustic filter is inserted. And we researched about the actual efficiency of a new developed custom-made HPD using a small size acoustic filter. Also, we found out that workers are more satisfied with new development than a former protection device from a workers' response.

On-line sensing of the interlacing process

“…For this reason, we decided to avoid to excite the microphone with components outside the frequency range of interest, using acoustic filters. The employment of acoustic filters is widely studied for example in the development of hearing protection devices in order to avoid the exposure of workers to damaging high frequency noise components [64]. Before going into the details of the design and test of the acoustic filters, I would like to give you an idea of the physics behind this concept.…”