Electrical audio signal processing systems and devices – Hearing aids – electrical – Specified casing or housing
Patent
1983-03-23
1985-05-14
Rubinson, Gene Z.
Electrical audio signal processing systems and devices
Hearing aids, electrical
Specified casing or housing
381 86, 381 91, 179187, 179107FD, H04R 108, H04R 128
Patent
active
045174172
ABSTRACT:
A microphone unit for mounting in a protective headwear including a housing member for housing the microphone unit and a sound introducing passage forming an aperture in the housing member for introducing a sound pressure into the microphone unit. The sound introducing passage includes a configuration wherein an area of the aperture thereof increases as the distance increases away from a sound collecting surface of the microphone unit. A communication passage is formed in the housing member which provides communication between a surface of the microphone unit other than the sound collecting surface and the exterior of the housing member. The housing for the microphone unit is mounted at a position displaced a predetermined distance away from a central axis of said protective headwear. The microphone unit selectively receives audible sounds generated by a user of the protective headwear. Sound tubes are connected to the speaker case and positioned along an inner surface of the protective headwear. The sound tubes are for transmitting a sound from said speaker unit to an ear of a user of the protective headwear. An audio signal control system is provided for transmitting an audio signal from a signal source including a microphone for sensing a sound from outside. A detector means is provided for detecting when the level of a frequency component of sound sensed by said microphone exceeds a predetermined reference level for a time period longer than a predetermined interval and for producing a detection signal. A control means is provided for stopping a transmission of at least one frequency component of said audio signal corresponding to said frequency component of sound upon presence of said detection signal.
REFERENCES:
patent: 3786519 (1974-01-01), Aileo
Hatcom.RTM. publication, 1979.
Dwyer James L.
Honda Giken Kogyo Kabushiki Kaisha
Rubinson Gene Z.
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