GB1365831A - Seismic playback/monitor system - Google Patents
Seismic playback/monitor systemInfo
- Publication number
- GB1365831A GB1365831A GB78972A GB78972A GB1365831A GB 1365831 A GB1365831 A GB 1365831A GB 78972 A GB78972 A GB 78972A GB 78972 A GB78972 A GB 78972A GB 1365831 A GB1365831 A GB 1365831A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signal
- digital
- analogue
- passed
- representing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000006243 chemical reaction Methods 0.000 abstract 1
- 230000000737 periodic effect Effects 0.000 abstract 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/28—Processing seismic data, e.g. for interpretation or for event detection
- G01V1/34—Displaying seismic recordings or visualisation of seismic data or attributes
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/66—Digital/analogue converters
- H03M1/74—Simultaneous conversion
Landscapes
- Engineering & Computer Science (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Acoustics & Sound (AREA)
- Environmental & Geological Engineering (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Geophysics (AREA)
- Analogue/Digital Conversion (AREA)
- Geophysics And Detection Of Objects (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
1365831 Producing visible displays from digital signals TEXACO DEVELOPMENT CORP 7 Jan 1972 [9 Feb 1971] 789/72 Heading G4H A visible display is formed from a set of digital words representing the equation; analogue value = ΠAG<SP>-E</SP> where G is constant and the digital word has some bits representing A, some bits representing E and a parity sign. A periodic reference signal V ref having a maximum and a minimum signal level is generated and is used to change a digital signal representing a number K every time V ref reaches its maximum. The signal representing A is entered into a shift register and is shifted by an amount K-E. The modified A is then converted to an analogue signal using V ref as reference voltage. The analogue values produced by a series of conversions are displayed on an oscillograph. The arrangement may be used for displaying seismic data. The digital word is stored in 18 stage register 20. Plus 8 volts is applied to comparator 34, and this is used to control sawtooth generator 32 producing a potential varying between 1 and 8 volts. The bits of signal A and parity sign S Πare entered into shift register 22. 3 Bit binary counter 26 is stepped by pulses from generator 32 and the output K of the counter is passed to subtractor unit 24 where E is subtracted from it. The resulting signal K-E is passed to shift register control 28 and shifts register 22 by the appropriate amount. After shifting the output of the register 22 is passed to D-A converter 30 and converted to analogue value V 0 . Signal V 0 is then passed to demultiplexer 38 and then to one of several chains of hold and filter circuits 42, 44 and thence to the oscillograph 46. The output of the converter may be averaged or the outputs of the filters summed and averaged and then used to control the frequency of generator 32. The signal K enables a fairly constant analogue output to be produced from the widely varying digital readings obtained from seismic readings as they decay.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US11384471A | 1971-02-09 | 1971-02-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1365831A true GB1365831A (en) | 1974-09-04 |
Family
ID=22351851
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB78972A Expired GB1365831A (en) | 1971-02-09 | 1972-01-07 | Seismic playback/monitor system |
Country Status (10)
| Country | Link |
|---|---|
| JP (1) | JPS53669B1 (en) |
| AR (1) | AR195862A1 (en) |
| BR (1) | BR7200690D0 (en) |
| CA (1) | CA974649A (en) |
| CH (1) | CH561899A5 (en) |
| DE (1) | DE2205530C3 (en) |
| FR (1) | FR2124585B1 (en) |
| GB (1) | GB1365831A (en) |
| IT (1) | IT947397B (en) |
| NL (1) | NL7200965A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3733470A1 (en) * | 1987-09-30 | 1989-04-20 | Prakla Seismos Ag | METHOD AND DEVICE FOR DISPLAYING SEISMIC TRACKS |
| JPH0278680U (en) * | 1988-11-29 | 1990-06-18 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3555540A (en) * | 1966-08-08 | 1971-01-12 | Sds Data Systems | Digital-to-analog converter with smooth recovery |
-
1972
- 1972-01-07 GB GB78972A patent/GB1365831A/en not_active Expired
- 1972-01-17 AR AR240105A patent/AR195862A1/en active
- 1972-01-25 NL NL7200965A patent/NL7200965A/xx not_active Application Discontinuation
- 1972-01-28 CA CA133,450A patent/CA974649A/en not_active Expired
- 1972-02-05 JP JP1258472A patent/JPS53669B1/ja active Pending
- 1972-02-05 DE DE2205530A patent/DE2205530C3/en not_active Expired
- 1972-02-07 CH CH173372A patent/CH561899A5/xx not_active IP Right Cessation
- 1972-02-07 BR BR690/72A patent/BR7200690D0/en unknown
- 1972-02-08 IT IT20341/72A patent/IT947397B/en active
- 1972-02-09 FR FR7204270A patent/FR2124585B1/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| BR7200690D0 (en) | 1973-05-24 |
| NL7200965A (en) | 1972-08-11 |
| IT947397B (en) | 1973-05-21 |
| CA974649A (en) | 1975-09-16 |
| JPS53669B1 (en) | 1978-01-11 |
| FR2124585B1 (en) | 1975-03-21 |
| CH561899A5 (en) | 1975-05-15 |
| DE2205530A1 (en) | 1972-09-14 |
| FR2124585A1 (en) | 1972-09-22 |
| AR195862A1 (en) | 1973-11-15 |
| DE2205530B2 (en) | 1975-01-09 |
| DE2205530C3 (en) | 1978-04-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |