ACOUSTIC SENSOR FOR USE IN BREATHING MASKS

摘要

A breathing mask adapted to be placed over a wearer's face, comprises a m ask body including a gas inlet port to be disposed in flow communication wit h the wearer's breathing passage for flow of a gas in a predetermined flow s tream there through upon inhalation by the wearer; a communications micropho ne (30) mounted to said mask body to capture the voice of the wearer, said c ommunications microphone generating sound signals; an attenuation device (34 ) for attenuating said sound signals; a sound monitor (36) for monitoring th e intensity of sound near the communications microphone in a predetermined f requency range, connected to a controller device (38) for activating the att enuation device when the sound intensity monitored by the sound monitor is i n a predetermined level range.