Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Parameter related to the reproduction or fidelity of a...
Patent
1992-10-22
1994-05-31
Wieder, Kenneth A.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Parameter related to the reproduction or fidelity of a...
324602, 73646, 381 58, H04R 2900
Patent
active
053172736
ABSTRACT:
A portable hearing protection device evaluation apparatus which can be taken into the field to measure noise attenuation of a muff type hearing protection device under actual working conditions is provided. The apparatus includes two miniature microphones, one positioned inside a muff near the ear, the other positioned outside the muff to detect the noise in the environment. These two microphones simultaneously receive input signals which are provided to circuitry which determines and displays a single number output representing the noise attenuation.
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Effects of Cup, Cushion, Band Force, Foam Lining and Various Design Parameters on the Attenuation of Earmuffs, R. Paakkonen, Mar. 1991, vol. 38/No. 2, pp. 59-65.
Draft Standard, Working Group S12.10, Hearing Protector Attenuation Apr. 1992.
Hanson William J.
Teare Peter R.
Brown Glenn W.
Liberty Mutual
Wieder Kenneth A.
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