| 摘要 |
The invention relates to a hearing protection earplug for being worn at least in part in the ear canal ( 28 ) of a person, comprising an integral shell ( 10 ) having an outer surface shaped for fitting at least in an outer part of the person's ear canal, an outer opening ( 18 ) for sound input, an acoustic filter element ( 20 ) within the shell for attenuating sound transmission through said earplug, and a resonance cavity ( 30 ) formed within the shell, the cavity being located between the outer opening and the filter element and being shaped as a resonator comprising an inner mechanical structure ( 32, 34, 38 ) which is designed such that the resonator has a basic resonance frequency between 800 Hz and 5 kHz, wherein the resonator is individually designed according to a desired sound frequency response of the person's outer ear and ear canal when wearing the earplug. The invention also relates to a corresponding manufacturing method.
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