A - Human Necessities – 61 – F
Patent
A - Human Necessities
61
F
2/78, 181/11.5
A61F 11/14 (2006.01) A61F 11/08 (2006.01)
Patent
CA 1168589
ABSTRACT OF THE DISCLOSURE: Hearing protectors having an earshell and ear cushion enclose a volume of air. A membrane in the earshell has a predetermined stiffness and mass so as to flatten the attenuation response of the protector from low frequencies (200Hz or less) up to frequencies important for understanding speech tat least 2kHz). Alternate or additional structures for flattening the response include further membranes and barriers dividing the enclosed volume of the shell with interconnecting tubes. An ear plug is also disclosed.
377426
Racal Acoustics Limited
Robic Robic & Associes/associates
LandOfFree
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