US3652979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Installation for the transmission of multiplexed seismic signals
Assignee: CGG SA
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Filing: 1970-03-05
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Granted: 1972-03-28
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Expires: 1990-03-05
Abstract
Abstract The electrical signals from different seismological pick-ups are recorded at a central recording unit by switching the units in succession to a single two wire transmission line. Switching is controlled by pulses transmitted on the line and by coding the pulses appropriately, e.g., pulse number coding or pulse pattern coding, the pick-ups can be switched at times such that the signals therefrom arrive at the central unit in any desired time sequence.
Inventors
- 👤 Philippe Angelle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:01
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/22; G08; G08C; G08C15/00; G08C15/06
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
152 words
An installation for the transmission to a central recording unit of electrical signals from different geophones spread on the ground along a recording zone or groups of geophones of seismological vibrations, this transmission installation being characterized in that it comprises a pulse generator and a single transmission line disposed in the zone of the geophones between the central recording unit and the pulse generator connected at the end of the line, and a plurality of connecting assemblages, each geophones being connected to the line by a corresponding assemblage comprising a multiplexing element including electronic gates for establishing communication between the geophones and the line, and an element for controlling the opening of the said gates in response to the specific reception of pulses from the pulse generator, such that the signals arrive at the central recording unit according to a multiplexing sequence corresponding exactly to the pulse emission sequence of the generator.
Claim 2
Dependent Claim
152 words
An installation for the transmission to a central recording unit of electrical signals from different geophones spread on the ground along a recording zone or groups of geophones of seismological vibrations, this transmission installation being characterized in that it comprises a pulse generator and a single transmission line disposed in the zone of the geophones between the central recording unit and the pulse generator connected at the end of the line, and a plurality of connecting assemblages, each geophones being connected to the line by a corresponding assemblage comprising a multiplexing element including electronic gates for establishing communication between the geophones and the line, and an element for controlling the opening of the said gates in response to the specific reception of pulses from the pulse generator, such that the signals arrive at the central recording unit according to a multiplexing sequence corresponding exactly to the pulse emission sequence of the generator.
Claim 3
Dependent Claim
42 words
An installation according to claim 1, characterized in that the generator is designed to transmit trains of successive identical pulses in number equal to that of the pick-ups, the element controlling the opening of each assemblage being connected to a pulse counter.
Claim 4
Dependent Claim
52 words
An installation according to claim 1, characterized in that the generator is designed to transmit in sequence complex pulse groups representing the addresses of the different pick-ups, each assemblage of each pick-up comprising a decoding circuit adapted to open the gates of the multi-plexing element on reception of the corresponding address group.
Claim 5
Dependent Claim
72 words
An installation according to claim 1, characterized in that each connection assemblage comprises means for the preliminary storage of a specific coded address, representative of its order of connection to the line, as well as coincidence means such that the opening of its multiplexing gates will be effected by coincidence of the stored address and of the pulses which the assemblage receives from the generator in the course of the recording stage.
Claim 6
Dependent Claim
66 words
An installation according to claim 4, characterized in that the storage means comprise an oscillator connected to a counter by means of an electronic gate, this gate being open on reception of a train of pulses transmitted by the central recording unit, then closed on reception of a second train of pulses transmitted in return by the generator on reception of the first train of pulses.
Claim 7
Dependent Claim
64 words
An installation according to claim 5, characterized in that the generator is designed to transmit trains of successive identical pulses in number equal at least to that of the pick-ups, and in that the Frequency of the oscillators is selected such that the address stored by the counter of each assemblage differs at least by one unit from the address of the adjacent assemblages.
Claim 8
Dependent Claim
28 words
An installation according to claim 1, characterized in that the electrical supply of each assemblage is effected from the central recording unit by means of the transmission line.
Claim 9
Dependent Claim
26 words
An installation according to claim 1 characterized in that the pulse generator is remote controlled from the central recording unit by means of the transmission line.
Claim 10
Dependent Claim
16 words
An installation according to claim 1, characterized in that the transmission line is a coaxial cable.
Claim 11
Dependent Claim
17 words
An installation according to claim 1, in which the transmission line is a two-wire protectively covered cable.
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) | 1975-03-28 | 1975-09-27 | 1976-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-28 | 1979-09-27 | 1980-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-28 | 1983-09-27 | 1984-03-28 | $7700.00 | Window Closed / Lapsed |