Microphone signal attenuating apparatus for oxygen masks

Details Microphone signal attenuating apparatus for oxygen masks Microphone signal attenuating apparatus for oxygen masks

1992-06-29

1994-05-03

Burr, Edgar S.

Surgery

Respiratory method or device

Means for transmitting, or facilitating, voice communication...

12820525, A62B 1808

Patent

active

053077938

ABSTRACT:
The microphone of a breathing mask such as an aircraft flight crew oxygen mask is disabled during inhalation to prevent transmission of air flow sounds. In the preferred embodiments, selected mechanisms determine when breathable gas has been delivered to the mask and in response, disable the microphone by disconnecting it during this time. In another embodiment, a cover shifts into position over the microphone to prevent or reduce reception of sounds thereby during delivery of gas to the mask.

REFERENCES:
patent: 3347229 (1967-10-01), Heitman
patent: 3415245 (1968-12-01), Yamamato et al.
patent: 3850168 (1974-11-01), Ferguson et al.
patent: 4799263 (1989-01-01), Banziger et al.

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