Microphone assembly having a windscreen of high acoustic resistivity and/or hydrophobic material
AssigneeGentex Corporation
InventorsAlan R. Watson, Robert C. Knapp, Robert R. Turnbull, William R. Spence, G. Bruce Poe, Michael A. Bryson
Life of this patent
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Abstract
A microphone assembly includes one or more transducers positioned in a housing. Circuitry is coupled to the transducer for outputting an electrical signal such that the microphone has a main lobe directed forwardly and attenuates signals originating from the sides and/or rear. The transducers can advantageously include multiple transducers, which, with the circuit, produce a desired sensitivity pattern. The microphone assembly can be employed in a vehicle accessory.
Claims25
A microphone assembly comprising:
- a housing having at least one acoustic port;
- a transducer disposed in said housing and acoustically coupled to said acoustic port;
- a windscreen sealed across said acoustic port, said windscreen having hydrophobic properties to prevent water from penetrating said housing through said acoustic port;
- and
- said windscreen having an acoustic resistivity of at least 1 acoustic Ω/cm2;
- a circuit board having a hole sized to receive at least a portion of said transducer, wherein said transducer is mounted within the hole in the circuit board such that a portion of said transducer extends below a bottom surface of said circuit board.
A vehicle accessory for mounting to a vehicle, comprising:
- a housing having at least one acoustic port;
- a transducer disposed in said housing and acoustically coupled to said acoustic port;
- and
- a windscreen disposed across said acoustic port, said windscreen having an acoustic resistivity of at least about 1 acoustic Ω/cm2.
The vehicle accessory for mounting to a vehicle, comprising:
- a housing having at least one acoustic port;
- a transducer disposed in said housing and acoustically coupled to said acoustic port,
- wherein said windscreen has an acoustic resistivity of at least about 2 acoustic Ω/cm2.
A rearview mirror assembly for a vehicle, comprising:
- a mirror subassembly including a mirror housing and adapted to be attached to the vehicle;
- a mirror disposed in said mirror housing;
- and
- a microphone assembly associated with said mirror subassembly comprising:
- a microphone housing having at least one acoustic port;
- a transducer disposed in said microphone housing and acoustically coupled to said acoustic port;
- and
- a windscreen disposed across said acoustic port, said windscreen having an acoustic resistivity of at least about 1 acoustic Ω/cm2.
Dependencies are inferred from the claim text.