THE ATTENUATION SURVEY OF A HIGH-LOW FREQUENCY EARPLUG
- VernacularTitle:高低频两用防噪声耳塞的研制和隔声效果观察
- Author:
Wenyuan GAO
- Publication Type:Journal Article
- Keywords:
earplug high-low frequency earplug attenuation for earplug noise preventive medicine hearing loss, noise-induced hearing loss, blast temporary threshold shift
- From:
Academic Journal of Second Military Medical University
1981;0(03):-
- CountryChina
- Language:Chinese
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Abstract:
Earplugs have effects on preventing noise. Many earplugs developed, when being used, may hinder speech communication because of their lack in frequency selectivity of attenuation.A new type earplug called a high-low frequency(HLF)earplug has been desingned. There is a Zigzag channel in the earplug, which lets speaking tones pass and absorbes high frequency noise. So it doesn't influence communication. And it could attenuate noise if channel be closed as well in an environemt with low frequency.According to Iso4869-1981 standard. HLF earplug's average attenuation is 29.1 dB. When the channel is opened its attenuation will be below 10 dB at low frequency; about 30 dB at high frequen-cy.
