| 摘要 |
The invention relates to a hearing protection earplug comprising a shell ( 10 ) to be worn at least in part in a user's ear canal, said shell being adapted to provide for a mechanical acoustic attenuation of at least 10 dB averaged over the audible frequency range when worn by the user, an active unit ( 12 ) comprising an acoustic output transducer ( 26 ) and means ( 30, 32, 60 ) for producing output audio signals for said output transducer, and means ( 34, 36, 38, 40, 56, 58, 80, 82, 84 ) for detachably connecting said active unit to said shell, wherein said shell comprises a sound passage ( 16, 16 ') extending between an outer opening ( 14 ) of said shell and an inner sound output opening ( 18, 18 ') at the distal end of said shell and comprising valve means ( 20, 120, 320 ) which are moveable, upon connecting said active unit to said shell, from a closed position in which said valve means acoustically close said sound passage into an open position in which said valve means acoustically open said sound passage, said valve means being biased towards said closed position in order to acoustically close said sound passage when said active unit is removed from said shell, and wherein said output transducer is acoustically connected to said sound output opening via said sound passage when said active unit is connected to said shell. The invention also relates to the use of such a hearing protection earplug.
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