Static and dynamic noise transmission over an oxygen mask [military aircrew applications]

Author

Darlington, P. ; Powell, G.A.

Author_Institution

Wyoming Univ., Laramie, WY, USA

fYear

1988

fDate

11-14 Apr 1988

Firstpage

2606

Abstract

A description is given of experimental work investigating the acoustic attenuation of an oxygen mask typical of those worn by military aircrew. Dominant noise transmission paths over the mask are identified, and the behaviour of the expiration valve during speech is reported. This valve, which constitutes the most important noise transmission path, opens and closes at a surprisingly high rate during speech. This introduces a time variance into the mask´s noise transmission, which is shown to complicate the application of adaptive cancellation techniques to the aircrew oxygen mask problem

Keywords

acoustic noise measurement; acoustic wave transmission; military equipment; noise abatement; oxygen; O₂; acoustic attenuation; adaptive cancellation techniques; adaptive noise canceller; dynamic noise transmission; expiration valve; military aircrew; noise abatement; noise transmission paths; oxygen mask; static noise transmission; time variance; Acoustic noise; Attenuation; Microphones; Noise cancellation; Noise measurement; Oxygen; Seals; Speech coding; Speech enhancement; Valves;

fLanguage

English

Publisher

ieee

Conference_Titel

Acoustics, Speech, and Signal Processing, 1988. ICASSP-88., 1988 International Conference on

Conference_Location

New York, NY

ISSN

1520-6149

Type

conf

DOI

10.1109/ICASSP.1988.197180

Filename

197180