Microphone system for communication devices
First Claim
Patent Images
1. A microphone system for communication devices comprising:
- a. a first input sound port that leads into a first omnidirectional microphone element;
b. a second input microphone port that leads into a second omnidirectional microphone element positioned near the first microphone element; and
c. a signal flow processor electrically connected to the first and second microphone elements;
wherein the signal flow processor provides an electrical time delay (“
τ
”
) only to the first microphone element and provides a compatible amplitude gain to the second microphone element;
wherein τ
=(w−
u)/c, the variable “
w”
equals the distance between the receiver and the second sound port, the variable “
c”
equals approximately 345,000 millimeters per second, and the variable “
u”
equals √
{square root over ( )}[w2+d22−
2 d2 w cos(κ
−
Ψ
)] with the variable “
d2”
being equal to the distance between the first and second input sound ports, with the variable “
κ
”
being equal to the angle of an ear reference point adjacent to the receiver and the second input sound port, and with the variable “
Ψ
”
being equal to the angle of the first input sound port and the second input sound port; and
wherein the signal flow processor subtracts the outputs of the first and second microphone elements to create a null that reduces external acoustic coupling.
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Abstract
The microphone system for communication devices that comprises an electric circuit comprising two microphone elements connected to a signal flow processor. This processor uses a digital signal processor or comparable analog circuitry to provide a particular electrical time delay (τ) to one of the microphone elements (nearest the ear or loudspeaker) and a compatible amplitude gain (Gm1) to the other microphone element (nearest the user'"'"'s mouth) in order to substantially reduce the external acoustic coupling and echo of communication devices in the receive and doubletalk state. Further, this processing system allows the microphone system to reduce the pickup of ambient noise in the send and idle state, while still being sensitive to the user'"'"'s speech.
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Citations
15 Claims
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1. A microphone system for communication devices comprising:
-
a. a first input sound port that leads into a first omnidirectional microphone element; b. a second input microphone port that leads into a second omnidirectional microphone element positioned near the first microphone element; and c. a signal flow processor electrically connected to the first and second microphone elements; wherein the signal flow processor provides an electrical time delay (“
τ
”
) only to the first microphone element and provides a compatible amplitude gain to the second microphone element;wherein τ
=(w−
u)/c, the variable “
w”
equals the distance between the receiver and the second sound port, the variable “
c”
equals approximately 345,000 millimeters per second, and the variable “
u”
equals √
{square root over ( )}[w2+d22−
2 d2 w cos(κ
−
Ψ
)] with the variable “
d2”
being equal to the distance between the first and second input sound ports, with the variable “
κ
”
being equal to the angle of an ear reference point adjacent to the receiver and the second input sound port, and with the variable “
Ψ
”
being equal to the angle of the first input sound port and the second input sound port; andwherein the signal flow processor subtracts the outputs of the first and second microphone elements to create a null that reduces external acoustic coupling. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for producing a null towards an acoustical driver of a communication device for reducing external acoustic coupling in the communication device, the method comprising the steps of:
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providing a microphone system for telecommunications having (i) a first input sound port that leads into a first omnidirectional microphone element having a first output; and (ii) a second input microphone port that leads into a second omnidirectional microphone element positioned near the first microphone element, the second microphone element having a second output; (iii) a signal flow processor electrically connected to the first and the second microphone elements; utilizing the signal flow processor to provide an electrical time delay (“
τ
”
) to the first output, wherein τ
=(w−
u)/c, the variable “
w”
equals the distance between the receiver and the second sound port, the variable “
c”
equals approximately 345,000 millimeters per second, and the variable “
u”
equals √
{square root over ( )}[w2+d22−
2 d2 w cos(κ
−
Ψ
)] with the variable “
d2”
being equal to the distance between the first and second input sound ports, with the variable “
κ
”
being equal to the angle of an ear reference point adjacent to the receiver and the second input sound port, and with the variable “
Ψ
”
being equal to the angle of the first input sound port and the second input sound port;utilizing the signal flow processor to provide an amplitude gain to the second output; and utilizing the signal flow process to subtract the first output from the second output to create a null that reduces external acoustic coupling. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification
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Current AssigneeMWM Acoustics LLC (Samsung Electronics Co. Ltd.)
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Original AssigneeMWM Acoustics LLC (Samsung Electronics Co. Ltd.)
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InventorsMcAteer, Jeffrey Phillip, Baumhauer, John C. Jr., Welsh, Christopher T., Michel, Alan D., Marcus, Larry A.
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Primary Examiner(s)Chin; Vivian
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Assistant Examiner(s)LAO, LUN S
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Application NumberUS10/670,899Time in Patent Office2,476 DaysField of Search381/92, 381/94.1, 381/98, 381/103, 381 7111- 7112, 455/63.1, 455/67.13, 455295-296, 455/570US Class Current381/92CPC Class CodesH04R 2410/05 Noise reduction with a sepa...H04R 3/005 for combining the signals o...
