Patent US3838389A successfully refreshed from Google Patents.
US3838389A
Expired / Lapsed
US
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Space monitoring gradient system
Assignee: Fried Krupp AG
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Filing: 1973-08-08
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Granted: 1974-09-24
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Expires: 1993-08-08
Abstract
Abstract A space monitoring gradient system including at least a plurality of transducers arranged to produce at least two pairs of transducers with the spacing of the transducer of each pair being less than one wavelength of the received signals produced by a noise source at the highest receivable frequency. The axes of the two pairs of transducers are perpendicular to one another with the axis of one pair being parallel to the ground and the axis of the other pair being perpendicular to the ground. A separate automatic gain control (AGC) amplifier is connected in series with the output of each of the transducers, and first and second difference circuits are provided for forming respective gradient voltage signals from the outputs from the respective AGC amplifiers of each pair of transducers. A first comparator compares the gradient voltage signal at the output of the first difference circuit, which is associated with a pair of transducers parallel to the ground, with a first settable comparison voltage and produces an ''''L'''' signal at its output whenever the output of the first difference circuit is equal to or less than the first comparison voltage. A second comparator compares the gradient voltage signal at the output of the second difference circuit with a second settable difference voltage and produces an ''''L'''' signal output whenever the output of the second difference circuit is greater than the second comparison voltage. The outputs of the first and second comparators are fed to an AND gate which produces an ''''L'''' signal at its output when an ''''L'''' signal is present at each of its inputs.
Inventors
- 👤 K Triebold
- 👤 C Buddruss
- 👤 A Cronjaeger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:45
CPC Classifications
G; G01; G01S; G01S3/00; G01S3/80; G01S3/802; Y; Y10; Y10S; Y10S367/00; Y10S367/909
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
342 words
A space monitoring gradient system including: a plurality of electroacoustical transducers which are arranged to form at least two pairs of transducers whose axes are perpendicular to one another and with the spacing between the two transducers of each pair being less than one wavelength of the received signals originating from a noise source at their highest receivable frequency, a first of said pairs of transducers having its axis parallel to the ground and a second of said pairs of transducers having its axis disposed perpendicular to the ground; a plurality of automatic gain control amplifiers each of which is connected in series with the output of a respective one of said transducers, a first difference circuit means, having its inputs connected to the outputs of the two of said automatic gain control amplifiers which are associated with the transducers of said first pair of transducers, for providing a first gradient voltage signal at its output; a first comparator means connected in series with said first difference circuit means, for comparing said first gradient voltage signal with a first settable comparison voltage and for providing a signal ''''L'''' at its output whenever said first gradient voltage is equal to or less than said first settable comparison voltage; a second difference circuit means, having its inputs connected to the outputs of the two of said automatic gain control amplifiers which are associated with the transducers of said second pair of transducers, for providing a second gradient voltage signal at its output; a second comparator means, connected in series with said second difference circuit means, for comparing said second gradient voltage signal with a second settable comparison voltage and for providing an ''''L'''' signal at its output whenever said second gradient voltage signal is greater than said second comparison voltage; and a first AND gate, having a respective input connected to the output of each of said first and second comparator means, said first AND gate providing an ''''L'''' signal at its output when an ''''L'''' signal is present at each of its inputs.
Claim 2
Dependent Claim
342 words
A space monitoring gradient system including: a plurality of electroacoustical transducers which are arranged to form at least two pairs of transducers whose axes are perpendicular to one another and with the spacing between the two transducers of each pair being less than one wavelength of the received signals originating from a noise source at their highest receivable frequency, a first of said pairs of transducers having its axis parallel to the ground and a second of said pairs of transducers having its axis disposed perpendicular to the ground; a plurality of automatic gain control amplifiers each of which is connected in series with the output of a respective one of said transducers, a first difference circuit means, having its inputs connected to the outputs of the two of said automatic gain control amplifiers which are associated with the transducers of said first pair of transducers, for providing a first gradient voltage signal at its output; a first comparator means connected in series with said first difference circuit means, for comparing said first gradient voltage signal with a first settable comparison voltage and for providing a signal ''''L'''' at its output whenever said first gradient voltage is equal to or less than said first settable comparison voltage; a second difference circuit means, having its inputs connected to the outputs of the two of said automatic gain control amplifiers which are associated with the transducers of said second pair of transducers, for providing a second gradient voltage signal at its output; a second comparator means, connected in series with said second difference circuit means, for comparing said second gradient voltage signal with a second settable comparison voltage and for providing an ''''L'''' signal at its output whenever said second gradient voltage signal is greater than said second comparison voltage; and a first AND gate, having a respective input connected to the output of each of said first and second comparator means, said first AND gate providing an ''''L'''' signal at its output when an ''''L'''' signal is present at each of its inputs.
Claim 3
Dependent Claim
38 words
A space monitoring gradient system as defined in claim 1 wherein there are four transducers disposed in a single plane perpendicular to the ground and forming said two pairs of transducers whose axes are perpendicular to one another.
Claim 4
Dependent Claim
167 words
A space monitoring gradient system as defined in claim 1 wherein said first and second pairs of transducers are disposed in a single plane perpendicular to the ground and further comprising: a third of said pairs of transducers, said third pair of transducers being disposed with its axis normal to said single plane; a third difference circuit means, having its inputs connected to the outputs of the two of said automatic gain control amplifiers which are associated with the transducers of said third pair of transducers, for providing a third gradient voltage signal at its output; and, a third comparator means, connected in series with said third difference circuit means, for comparing said third gradient voltage signal with a third settable comparison voltage and for providing an ''''L'''' signal at its output whenever said third gradient voltage signal is equal to or less than said third comparison voltage, the output of said third comparator means being connected to a further respective input of said first AND gate.
Claim 5
Dependent Claim
46 words
A space monitoring system as defined in claim 3 wherein said first and second pairs of transducers are formed by four transducers disposed in a single plane perpendicular to the ground, and said third pair of transducers is formed by a fifth and a sixth transducer.
Claim 6
Dependent Claim
112 words
A space monitoring gradient system as defined in claim 3 wherein said first, second and third pairs of transducers are formed by four of said transducers which define two planes which are perpendicular to one another in that one of said transducers is disposed at the origin of a three-dimensional, rectangular coordinate system and each one of the three other of said transducers is disposed at the same distance from said origin on one of said three coordinate axes, whereby each of said transducers on one of the coordinate axis forms a respective one of said pairs of transducers with the one of said transducers at said origin of said coordinate system.
Claim 7
Dependent Claim
197 words
A space monitoring gradient system as defined in claim 3 further comprising: first, second and third differentiating circuits connected to the outputs of said first, second and third difference circuit means, respectively, for providing output signal corresponding to the time differentiated curves of said first, second and third gradient voltages respectively; fourth and fifth comparator means, connected to the outputs of said first and third differentiating circuits respectively, for providing ''''L'''' signals at their respective outputs whenever the respective time differentiated curve of the associated gradient voltage is greater than or equal to zero; a sixth comparator means, connected to the output of said second differentiating circuit for providing an ''''L'''' signal at its output whenever the time differentiated curve of said second gradient voltage is less than or equal to zero; a second AND gate having its two inputs connected respectively to the outputs of said fourth and fifth comparator means; a NOR gate having its two inputs connected respectively to the outputs of said second AND gate and said sixth comparator means; and a third AND gate having its two inputs connected respectively to the outputs of said NOR gate and said first AND gate.
Claim 8
Dependent Claim
63 words
A space monitoring gradient system as defined in claim 6 further comprising an OR gate having its two inputs connected respectively to the output of said second AND gate and the output of said sixth comparator means; and a fourth AND gate having its two inputs connected respectively to the output of said OR gate and the output of said first AND gate.
Claim 9
Dependent Claim
165 words
A space monitoring gradient system as defined in claim 2 further comprising first and second differentiating circuits connected to the outputs of said first and second comparator means respectively for providing output signals corresponding to the time differentiated curves of said first and second gradient voltages respectively; a third comparator means connected to the output of said first differentiated circuit for providing an ''''L'''' signal at its output whenever the time differentiated curve of said first gradient voltage is greater than or equal to zero; a fourth comparator means connected to the output of saId second differentiating circuit for providing an ''''L'''' signal at its output whenever the time differentiated curve of said second gradient voltage is less than or equal to zero; a NOR gate having its two inputs connected respectively to the outputs of said third and fourth comparator means; and a second AND gate having its two inputs connected respectively to the outputs of said NOR gate and said first AND gate.
Claim 10
Dependent Claim
54 words
A space monitoring gradient system as defined in claim 8 further comprising an OR gate having its two inputs connected respectively to the outputs of said third and fourth comparator means; and a third AND gate having its two inputs connected respectively to the outputs of said OR gate and said first AND gate.
References Cited (Backward Citations)
US3319218A
Cited
US3464056A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-23 | 1978-03-25 | 1978-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-23 | 1982-03-25 | 1982-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-23 | 1986-03-25 | 1986-09-24 | $7700.00 | Window Closed / Lapsed |