Patent US4752961A successfully refreshed from Google Patents.
US4752961A
Expired / Lapsed
US
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Microphone arrangement
Assignee: Nortel Networks Ltd
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Filing: 1985-09-23
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Granted: 1988-06-21
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Expires: 2005-09-23
Abstract
Abstract A microphone arrangement, suitable for a telephone handset, comprises an array of microphone transducers, conveniently pressure transducers arranged at the vertices of a cube. Signal processing circuitry derives from the transducer outputs signals representing the magnitude and direction of the pressure gradient of the sound field at the array. In response to these signals, the microphone transducer outputs are weighted so as to direct the directional sensitivity lobe of the microphone towards the source of the maximum sound detected thereby.
Inventors
- 👤 David A. Kahn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:35
CPC Classifications
H; H04; H04R; H04R3/00; H04R3/005; H04M; H04M1/00; H04M1/02; H04M1/19; H04R5/00; H04R5/027
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
85 words
A microphone arrangement comprising: an array of microphone transducers, each having an output for coupling a signal therefrom, the transducers being orthogonally spaced from each other; means for deriving from the outputs of said microphone transducers a signal representing the magnitude and direction of a pressure gradient of a sound field at the array; means responsive to said signal for weighting said outputs individually such that an axis of maximum sensitivity of the transducers is directed towards a source of maximum instant sound detected thereby.
Claim 2
Dependent Claim
85 words
A microphone arrangement comprising: an array of microphone transducers, each having an output for coupling a signal therefrom, the transducers being orthogonally spaced from each other; means for deriving from the outputs of said microphone transducers a signal representing the magnitude and direction of a pressure gradient of a sound field at the array; means responsive to said signal for weighting said outputs individually such that an axis of maximum sensitivity of the transducers is directed towards a source of maximum instant sound detected thereby.
Claim 3
Dependent Claim
29 words
A microphone arrangement as defined in claim 1, wherein said arrangement comprises three pressure gradient microphone transducers arranged such that their respective axes of maximum sensitivity are not coplanar.
Claim 4
Dependent Claim
39 words
A microphone arrangement as defined in claim 1, wherein said arrangement comprises four pressure microphone transducers arranged mutually spaced in a non-planar configuration, three spaced apart in mutually intersecting planes, the fourth positioned at the intersection of such planes.
Claim 5
Dependent Claim
101 words
A telephone set comprising a pressure gradient microphone arrangement comprising three microphone transducers each having an axis of maximum sensitivity, the three axes each extending in a respective one of three mutually intersecting orthogonal planes, means for deriving from respective outputs of said microphone transducers a signal representing the magnitude and direction of a pressure gradient of a sound field at the arrangement, and means for weighting each of said outputs of said microphone transducers, in response to said signal, so as to maximize the sensitivity of the microphone arrangement in a direction towards a source of maximum sound detected thereby.
Claim 6
Dependent Claim
101 words
A telephone set comprising a pressure gradient microphone arrangement comprising three microphone transducers each having an axis of maximum sensitivity, the three axes each extending in a respective one of three mutually intersecting orthogonal planes, means for deriving from respective outputs of said microphone transducers a signal representing the magnitude and direction of a pressure gradient of a sound field at the arrangement, and means for weighting each of said outputs of said microphone transducers, in response to said signal, so as to maximize the sensitivity of the microphone arrangement in a direction towards a source of maximum sound detected thereby.
Claim 7
Dependent Claim
29 words
A telephone set as defined in claim 4, wherein said arrangement comprises three pressure gradient microphone transducers arranged such that their respective axes of maximum sensitivity are not coplanar.
Claim 8
Dependent Claim
27 words
A telephone set as defined in claim 4, wherein said means for deriving comprises means responsive to said outputs for deriving the direction of said pressure gradient.
Claim 9
Dependent Claim
23 words
A telephone set as defined in claim 6, wherein said means for deriving said signal serves to generate a set of orthogonal vectors.
Claim 10
Dependent Claim
27 words
A telephone set as defined in claim 5, 6 or 7, comprising a handset and a base member wherein said microphone transducers are mounted in said handset.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-06-21 | 1991-12-21 | 1992-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-21 | 1995-12-21 | 1996-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-21 | 1999-12-21 | 2000-06-21 | $7700.00 | Window Closed / Lapsed |