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Document ID (ISN)42728
CIS number 84-1565
ISSN - Serial title 0174-1098 - Zeitschrift für Lärmbekämpfung
Year 1984
Convention or series no.
Author(s) Ferekidis E., Papafrangos K., Adamopoulos G., Pantazopoulos P.
Title New objective measuring method for testing hearing protectors
Original title Eine neues objektives Messverfahren bei der Prüfung von Gehörschützern [in German]
Bibliographic information 1984, Vol.32, No.3, p.63-66. Illus. 6 ref.
Abstract In addition to comfort and worker acceptance, attenuation is a decisive property in the choice of hearing protectors. Attenuation of sound reaching one (test) ear can be determined by measuring the stapedius reflex of the other (reference) ear. This reflex is a movement of the eardrum caused by contraction of the muscles of the inner ear; it can be measured by plugging the reference ear with a pressure-sensing device. Results with and without various protective devices (medical cotton, glass fibre earplugs, wax earplugs) in the test ear showed that the threshold of the stapedius reflex increases with increasing attenuation, but also with the frequency of the applied sound (500-4000Hz). The advantages of the method are that it does not require judgements by the person being tested, and does not require expensive auxiliary facilities such as special testing chambers.
Descriptors (primary) hearing protection; noise; ear; hearing threshold; sound attenuation
Descriptors (secondary) evaluation of equipment; sound transmission loss; hearing conservation; human experiments; earplugs
Document type D - Periodical articles
Subject(s) Noise, hearing and vibration
Broad subject area(s)
Browse category(ies) Noise
Hearing protection