Acoustic sensor for use in breathing masks

Abstract

A breathing mask adapted to be placed over a wearer's face, comprises a mask body including a gas inlet port to be disposed in flow communication with the wearer's breathing passage for flow of a gas in a predetermined flow stream there through upon inhalation by the wearer; a communications microphone (30) mounted to said mask body to capture the voice of the wearer, said communications microphone generating sound signals; an attenuation device (34) for attenuating said sound signals; a sound monitor (36) for monitoring the intensity of sound near the communications microphone in a predetermined frequency range, connected to a controller device (38) for activating the attenuation device when the sound intensity monitored by the sound monitor is in a predetermined level range.

Description

technical field [0001] The invention relates to a breathing mask with a built-in microphone. Background technique [0002] Most aircraft are equipped with breathing mask systems to supply oxygen to crew members in emergency situations, such as in oxygen depleted environments during aircraft decompression. During such emergency aircraft operations, pilots, navigators, and other flight crew members may wear breathing masks that incorporate the required breathing regulator and microphone systems. The breathing mask must contain a microphone in order to maintain communication with other crew members or with control tower personnel during the emergency. [0003] In most microphone systems, the sound emitted by the wearer activates a microphone which converts the received sound into an audio signal for transmission. Unfortunately, the sound picked up by the microphone contains not only the wearer's voice, but also background noise. The sound of air flowing through the mask's br...

AI Technical Summary

Problems solved by technology

[0008] However, such passivated devices are very sensitive to regulation

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