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US 7,443,988 B2Granted
Vehicle accessory microphone
AssigneeGentex Corporation
InventorsRobert R. Turnbull, Robert C. Knapp, Alan R. Watson, G. Bruce Poe
Life of this patent
Estimating the term…
Abstract
A microphone 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. The microphone transducers can advantageously include multiple transducers, which with the circuit produce a desired sensitivity pattern. The microphone can be employed in a vehicle accessory.
Claims18
A vehicle accessory, comprising:
- a housing;
- a mirror element;
- at least one first transducer positioned in the housing;
- at least one second transducer positioned in the housing, wherein the first and second transducers are positioned in spaced relation inside the housing;
- a circuit coupled to the first and second transducers for combining the output signal of the first and second transducers to produce a combined audio signal;
- a high pass filter for filtering the combined audio signal to produce an enhanced audio signal with a reduced noise component;
- and
- wherein a signal entering the second transducer is electronically delayed using a time delay circuit by an amount equal to the time period required for sound to travel a predetermined distance between the first transducer and the second transducer.
5 more elements
A vehicle rearview mirror accessory, comprising:
- a mirror element;
- a housing including at least one microphone port;
- at least one first transducer positioned in the housing;
- at least one second transducer positioned in the housing, wherein the first and second transducers are positioned in spaced relation inside the housing;
- a circuit for combining the output signal of the first and second transducers;
- a filter for producing an audio signal with a reduced noise component below a predetermined frequency;
- and
- wherein a signal entering the at least one second transducer is electronically delayed using a time delay circuit by an amount equal to the time period required for sound to travel a predetermined distance between the at least one first transducer and the at least one second transducer.
5 more elements
A vehicle rearview mirror accessory, comprising:
- a mirror element;
- at least one first transducer positioned in the housing;
- at least one second transducer positioned in the housing, wherein the first and second transducers are positioned in spaced relation inside the housing;
- a housing having at least one audio port for directing audio to the at lest one first transducer and the at least one second transducer;
- an amplifier circuit for combining the output signal of the first and second transducers;
- a high pass filter for providing an audio signal with a reduced noise component below that of the human voice;
- and
- wherein a signal entering the at least one second transducer is electronically delayed using a time delay circuit by an amount equal to the time period required for sound to travel a predetermined distance between the at least one first transducer and the at least one second transducer.
5 more elements
Dependencies are inferred from the claim text.