Vehicle accessory microphone
First Claim
Patent Images
1. A vehicle accessory comprising:
- an accessory housing for attaching to a vehicle;
a first transducer carried by said accessory housing and generating a first audio signal;
a second transducer carried by said accessory housing and generating a second audio signal; and
a microphone interface circuit electrically coupled between said transducers and a remote processing circuit located remote from the vehicle accessory, said microphone interface circuit comprising;
a first electrical signal path extending between said first transducer and the remote processing circuit, and a second electrical signal path extending between said second transducer and the remote processing circuit, said second electrical signal path including a phase inverter circuit provided proximate said second transducer for inverting the phase of the second audio signal such that the second audio signal transmitted over the second electrical signal path has an inverted phase relative to the first audio signal transmitted over the first electrical signal path, and such that any line-induced noise present on the first electrical signal path will also be present on the second electrical signal path and will be in-phase with the line-induced noise on the first electrical signal path.
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Accused Products
Abstract
A microphone assembly includes one or more transducers positioned in one or more housings. A processing circuit is coupled to the transducer for outputting an electrical signal such that the microphone in combination with the processing circuit very effectively cancels noise. The microphone assembly can be employed in a vehicle accessory.
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Citations
49 Claims
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1. A vehicle accessory comprising:
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an accessory housing for attaching to a vehicle;
a first transducer carried by said accessory housing and generating a first audio signal;
a second transducer carried by said accessory housing and generating a second audio signal; and
a microphone interface circuit electrically coupled between said transducers and a remote processing circuit located remote from the vehicle accessory, said microphone interface circuit comprising;
a first electrical signal path extending between said first transducer and the remote processing circuit, and a second electrical signal path extending between said second transducer and the remote processing circuit, said second electrical signal path including a phase inverter circuit provided proximate said second transducer for inverting the phase of the second audio signal such that the second audio signal transmitted over the second electrical signal path has an inverted phase relative to the first audio signal transmitted over the first electrical signal path, and such that any line-induced noise present on the first electrical signal path will also be present on the second electrical signal path and will be in-phase with the line-induced noise on the first electrical signal path. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A vehicle accessory comprising:
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an accessory housing for attaching to a vehicle;
a first transducer carried by said accessory housing and generating a first audio signal;
a second transducer carried by said accessory housing and generating a second audio signal; and
a microphone interface circuit electrically coupled between said transducers and a remote processing circuit located remote from the vehicle accessory, said microphone interface circuit comprising;
a first electrical signal path extending between said first transducer and the remote processing circuit, and a second electrical signal path extending between said second transducer and the remote processing circuit, said second electrical signal path including a phase inverter circuit provided proximate said second transducer for inverting the phase of the second audio signal, wherein the audio signals generated by said transducers are high-gain audio signals.
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10. A vehicle accessory comprising:
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an accessory housing for attaching to a vehicle;
a first transducer carried by said accessory housing and generating a first audio signal;
a second transducer carried by said accessory housing and generating a second audio signal;
a microphone housing having a plurality of ports with windscreens provided across said ports, said first and second transducers positioned in said microphone housing, the front of said second transducer facing a different direction from the front of said first transducer, wherein said ports, windscreens and transducers are configured such that said microphone assembly exhibits a first polar pattern with null aimed at a driver of the vehicle, and a second polar pattern with a null aimed at a front passenger area of the vehicle; and
a microphone interface circuit electrically coupled between said transducers and a remote processing circuit located remote from the vehicle accessory, said microphone interface circuit comprising;
a first electrical signal path extending between said first transducer and the remote processing circuit, and a second electrical signal path extending between said second transducer and the remote processing circuit, said second electrical signal path including a phase inverter circuit provided proximate said second transducer for inverting the phase of the second audio signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 24)
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22. A vehicle accessory comprising:
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an accessory housing for attaching to a vehicle;
a first transducer carried by said accessory housing and generating a first audio signal;
a second transducer carried by said accessory housing and generating a second audio signal;
a high frequency boost circuit coupled to said transducers for receiving the audio signal and for boosting the frequency response at high frequencies to compensate for the effect of the vehicle on the frequency response of said transducers; and
a microphone interface circuit electrically coupled between said transducers and a remote processing circuit located remote from the vehicle accessory, said microphone interface circuit comprising;
a first electrical signal path extending between said first transducer and the remote processing circuit, and a second electrical signal path extending between said second transducer and the remote processing circuit, said second electrical signal path including a phase inverter circuit proximate said second transducer for inverting the phase of the second audio signal. - View Dependent Claims (23)
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25. A vehicle accessory comprising:
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an accessory housing for attaching to a vehicle;
a first transducer carried by said accessory housing and generating a first audio signal;
a second transducer carried by said accessory housing and generating a second audio signal; and
a microphone interface circuit electrically coupled between said transducers and a remote processing circuit located remote from the vehicle accessory, said microphone interface circuit comprising;
a first electrical signal path extending between said first transducer and the remote processing circuit, and a second electrical signal path extending between said second transducer and the remote processing circuit, said second electrical signal path including a phase inverter circuit provided proximate said second transducer for inverting the phase of the second audio signal, wherein said first transducer is disposed in a first microphone assembly supported by said accessory housing, and said second transducer is disposed in a second microphone assembly supported by said accessory housing at a location laterally spaced from said first transducer, wherein each of said first and second microphone assemblies include a front port and a rear port, wherein the distance between the front port and the rear port of each of said microphone assemblies is at least about 3.5 mm. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
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42. A vehicle accessory comprising:
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an accessory housing for attaching to a vehicle;
a first transducer carried by said accessory housing and generating a first audio signal;
a second transducer carried by said accessory housing and generating a second audio signal; and
a microphone interface circuit electrically coupled between said transducers and a remote processing circuit located remote from the vehicle accessory, said microphone interface circuit comprising;
a first electrical signal path extending between said first transducer and the remote processing circuit, and a second electrical signal path extending between said second transducer and the remote processing circuit, said second electrical signal path including a phase inverter circuit provided proximate said second transducer for inverting the phase of the second audio signal, wherein said second transducer is supported by said accessory housing at a location that is laterally spaced from said first transducer, and wherein the vehicle accessory further comprises a separator disposed between said first and second transducers to physically deflect airflow coming from the side of said first transducer away from said second transducer and to physically deflect airflow coming from the side of said second transducer away from said first transducer. - View Dependent Claims (43, 44, 45)
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46. A vehicle accessory comprising:
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an accessory housing for attaching to a vehicle;
a first transducer carried by said accessory housing and generating a first audio signal;
a second transducer carried by said accessory housing and generating a second audio signal; and
a microphone interface circuit electrically coupled between said transducers and a remote processing circuit located remote from the vehicle accessory, said microphone interface circuit comprising;
a first electrical signal path extending between said first transducer and the remote processing circuit, and a second electrical signal path extending between said second transducer and the remote processing circuit, said second electrical signal path including a phase inverter circuit provided proximate said second transducer for inverting the phase of the second audio signal, wherein said accessory housing is a mirror housing of a rearview mirror assembly, and said vehicle accessory further comprises;
a mirror disposed in said mirror housing and having a front surface;
a first microphone housing supported by said mirror housing, wherein said first and second transducers are disposed in said first microphone housing;
a second microphone housing supported by said mirror housing; and
third and fourth transducers disposed in said second microphone housing, wherein said first microphone housing is disposed closer to the front surface of said mirror than said second microphone housing, said second transducer and said fourth transducer being provided to respectively alter the polar pattern associated with said first and second microphone housings to compensate for frequency discrepancies caused by the proximity of said first microphone housing to the front surface of said mirror. - View Dependent Claims (47, 48, 49)
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Specification