Patent US3895342A successfully refreshed from Google Patents.
US3895342A
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Digital field compositing system
Assignee: AMF GEO SPACE Corp A CORP OF TEXAS
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Filing: 1968-10-16
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Granted: 1975-07-15
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Expires: 1988-10-16
Abstract
Abstract This invention relates to the processing of electrical signals and to an improved method and apparatus for combining or compositing in the field electric signals derived from a seismic exploration system, thereby obtaining a reduction in the cost of processing digital tapes by office computers as well as providing to the geologist in the field on-the-spot information useful to better guide the progress of the exploration crews. Each sample of raw data may be selectively eliminated from or added to the results of the compositing process.
Inventors
- 👤 A J Mallett
- 👤 Jerrell F Moffitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:12
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/28; G01V2210/00; G01V2210/20
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
238 words
In a method for digitally compositing seismic data derived from a plurality of analog channels, each channel containing a binary-gain-ranging amplifier for ampLifying the individual trace data in each channel, the trace data including (a) an indication of the amplitude of the trace data at the output of said amplifier and (b) an exponent corresponding to the gain of the amplifier for said amplitude indication, the steps of: providing a plurality of recording tracks on a continuous-loop movable magnetic tape; grouping a number of said tracks to form a composite data file for periodically recording thereon composited data including (a) an indication of the amplitude of the composited data and (b) an initial exponent corresponding to an initial gain value of the trace data; grouping another number of said tracks to form a trace data file for periodically recording thereon the output trace data from said analog channel; periodically and simultaneously reading out from said tape both said recorded composited data and said trace data; determining the magnitude of the difference between the readout trace gain exponent and said initial exponent; normalizing said readout trace data so that the gain exponent of said readout trace data corresponds to said initial exponent, only when said magnitude is within predetermined acceptable limits; combining the normalized trace data with the readout composited data to form new composited data; and recording said new composited data in said composite file on said tape.
Claim 2
Dependent Claim
238 words
In a method for digitally compositing seismic data derived from a plurality of analog channels, each channel containing a binary-gain-ranging amplifier for ampLifying the individual trace data in each channel, the trace data including (a) an indication of the amplitude of the trace data at the output of said amplifier and (b) an exponent corresponding to the gain of the amplifier for said amplitude indication, the steps of: providing a plurality of recording tracks on a continuous-loop movable magnetic tape; grouping a number of said tracks to form a composite data file for periodically recording thereon composited data including (a) an indication of the amplitude of the composited data and (b) an initial exponent corresponding to an initial gain value of the trace data; grouping another number of said tracks to form a trace data file for periodically recording thereon the output trace data from said analog channel; periodically and simultaneously reading out from said tape both said recorded composited data and said trace data; determining the magnitude of the difference between the readout trace gain exponent and said initial exponent; normalizing said readout trace data so that the gain exponent of said readout trace data corresponds to said initial exponent, only when said magnitude is within predetermined acceptable limits; combining the normalized trace data with the readout composited data to form new composited data; and recording said new composited data in said composite file on said tape.
Claim 3
Dependent Claim
265 words
In a system for digitally compositing seismic data derived from a plurality of analog channels, each channel containing a binary-gain-ranging amplifier for amplifying the individual trace data in each channel, the trace data including (a) an indication of the amplitude of the trace data at the output of said amplifier and (b) an exponent corresponding to the gain of the amplifier for said amplitude indication, comprising: a movable, continuous-loop, magnetic tape defining a plurality of recording tracks, a number of tracks being arranged to form a composite data file for periodically recording composited data thereon including (a) an indication of the amplitude of the composited data and (b) an initial exponent corresponding to an initial gain value of the trace data; another number of tracks being arranged to form a trace data file for periodically recording thereon the output trace data from said analog channels; readout means for periodically and simultaneously reading out from said tape both said recorded composited data and said trace data; means for determining the magnitude of the difference between the readout trace gain exponent and said initial exponent; normalizing means coupled to said readout means and adapted to normalize said readout trace data so that the exponent of said readout trace data corresponds to said initial exponent, only when said magnitude is within predetermined acceptable limits; combining means coupled to said normalizing means for combining the normalized trace data with the readout composited data to form new composited data; and recording means coupled to said combining means for recording said new composited data in said composite file on said tape.
Claim 4
Dependent Claim
265 words
In a system for digitally compositing seismic data derived from a plurality of analog channels, each channel containing a binary-gain-ranging amplifier for amplifying the individual trace data in each channel, the trace data including (a) an indication of the amplitude of the trace data at the output of said amplifier and (b) an exponent corresponding to the gain of the amplifier for said amplitude indication, comprising: a movable, continuous-loop, magnetic tape defining a plurality of recording tracks, a number of tracks being arranged to form a composite data file for periodically recording composited data thereon including (a) an indication of the amplitude of the composited data and (b) an initial exponent corresponding to an initial gain value of the trace data; another number of tracks being arranged to form a trace data file for periodically recording thereon the output trace data from said analog channels; readout means for periodically and simultaneously reading out from said tape both said recorded composited data and said trace data; means for determining the magnitude of the difference between the readout trace gain exponent and said initial exponent; normalizing means coupled to said readout means and adapted to normalize said readout trace data so that the exponent of said readout trace data corresponds to said initial exponent, only when said magnitude is within predetermined acceptable limits; combining means coupled to said normalizing means for combining the normalized trace data with the readout composited data to form new composited data; and recording means coupled to said combining means for recording said new composited data in said composite file on said tape.
References Cited (Backward Citations)
US3437991A
Cited
US3466596A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-14 | 1979-01-13 | 1979-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-14 | 1983-01-13 | 1983-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-14 | 1987-01-13 | 1987-07-15 | $7700.00 | Window Closed / Lapsed |