US3872465A
Expired / Lapsed
US
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Seismic playback/monitor system
Assignee: Texaco Inc
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Filing: 1973-04-27
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Granted: 1975-03-18
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Expires: 1993-04-27
Abstract
Abstract Hereinafter disclosed is methodology and apparatus for converting wide dynamic amplitude range digital data recorded in floating point digital word form, comprising a binary coded mantissa and a binary coded exponent, to an analog signal or visible display, such as an oscillogram, or ''''wiggle trace,'''' of selectively compressed dynamic amplitude range. The digital word occupying a number of binary digit, or bit, positions is, in algebraic form, + OR - AG E; wherein A represents the mantissa or argument, G represents the base, or radix, of the number system employed, and E represents the exponent. Since the radix G is constant, the only bits that have to be recoreded are those bits representing the mantissa A and the exponent E. In reconverting the aforementioned digital data to analog form data for making an oscillogram, wiggle trace or other visible display, the invention involves the selective compression of the dynamic amplitude range of the analog signals and, at the same time, avoiding the introduction of serious distortions.
Inventors
- 👤 Robert J Loofbourrow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:10
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/28; G01V1/34; H; H03; H03M; H03M1/00; H03M1/66; H03M1/74
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
244 words
A method for providing analog signals Vo, suitable for making a visible display, in accordance with the following equation: ein + OR - AG E wherein ein represents the amplitude of a particular analog signal among a wide dynamic range of analog signals, A represents a matissa, G represents a radix of the number system used, and E represents an exponent and wherein G is a constant, which comprises; providing digital signals forming a digital word for each analog signal in said range of analog signals, some of said signals in a digital word represent A and some represent E; generating a periodic analog reference signal Vref which has maximum and minimum signal levels; generating a digital signal corresponding to a number K, changing said K digital signal so as to change the value of the number K each time Vref reaches its maximum level; combining the digital signals corresponding to K and E to produce another digital signal corresponding to (K - E); shifting the position of the digital signals corresponding to the term A in accordance with the K - E digital signal to produce another digital signal representing a modified A; combining the analog signal Vref and the signal representing a modified A to produce an analog signal Vo for each digital word; averaging each of the analog signals Vo developed from each digital word; and producing said analog signal Vref as a function of the analog signals Vo so averaged.
Claim 2
Independent Claim
244 words
A method for providing analog signals Vo, suitable for making a visible display, in accordance with the following equation: ein + OR - AG E wherein ein represents the amplitude of a particular analog signal among a wide dynamic range of analog signals, A represents a matissa, G represents a radix of the number system used, and E represents an exponent and wherein G is a constant, which comprises; providing digital signals forming a digital word for each analog signal in said range of analog signals, some of said signals in a digital word represent A and some represent E; generating a periodic analog reference signal Vref which has maximum and minimum signal levels; generating a digital signal corresponding to a number K, changing said K digital signal so as to change the value of the number K each time Vref reaches its maximum level; combining the digital signals corresponding to K and E to produce another digital signal corresponding to (K - E); shifting the position of the digital signals corresponding to the term A in accordance with the K - E digital signal to produce another digital signal representing a modified A; combining the analog signal Vref and the signal representing a modified A to produce an analog signal Vo for each digital word; averaging each of the analog signals Vo developed from each digital word; and producing said analog signal Vref as a function of the analog signals Vo so averaged.
Claim 3
Dependent Claim
32 words
A method as described in claim 1 further comprising the steps of holding And filtering each analog signal Vo to produce a final analog signal; and visibly displaying the final analog signals.
Claim 4
Independent Claim
248 words
A system for providing analog signals Vo, suitable for making a visible display, in accordance with the following equation: ein + or - AG E wherein ein represents the amplitude of a particular analog signal among a wide dynamic range of analog signals, A represents a matissa, G represents a radix of the number system used and E represents an exponent and wherein G is a constant, comprising means for providing digital signals forming a digital word for each analog signal in said range of analog signals, some of said digital signals in each digital word represent A and some represent E; means for generating a periodic analog reference signal Vref which has maximum and minimum signal levels; means for generating a digital signal representing a number K and changing said digital signal and hence the number E each time Vref reaches its maximum level; means for combining the digital signal representing K and E to produce another digital signal representing (K - E); means for shifting the position of digital signals representing A in response to the digital signal representing (K - E) to produce another digital signal representing a modified A; means for combining the analog signal Vref and the signal representing a modified A to produce an analog signal Vo for each digital word; means for averaging each of the analog signals Vo developed from each digital word; and means for producing said signal Vref as a function of the analog signals Vo so averaged.
Claim 5
Independent Claim
248 words
A system for providing analog signals Vo, suitable for making a visible display, in accordance with the following equation: ein + or - AG E wherein ein represents the amplitude of a particular analog signal among a wide dynamic range of analog signals, A represents a matissa, G represents a radix of the number system used and E represents an exponent and wherein G is a constant, comprising means for providing digital signals forming a digital word for each analog signal in said range of analog signals, some of said digital signals in each digital word represent A and some represent E; means for generating a periodic analog reference signal Vref which has maximum and minimum signal levels; means for generating a digital signal representing a number K and changing said digital signal and hence the number E each time Vref reaches its maximum level; means for combining the digital signal representing K and E to produce another digital signal representing (K - E); means for shifting the position of digital signals representing A in response to the digital signal representing (K - E) to produce another digital signal representing a modified A; means for combining the analog signal Vref and the signal representing a modified A to produce an analog signal Vo for each digital word; means for averaging each of the analog signals Vo developed from each digital word; and means for producing said signal Vref as a function of the analog signals Vo so averaged.
Claim 6
Dependent Claim
34 words
A system as described in claim 3 comprising means for holding and filtering each analog signal Vo to produce a final analog signal; and means for visibly displaying the final analog signals thus produced.
Claim 7
Dependent Claim
22 words
A system as described in claim 4 in which the means for providing signal Vref includes means for providing a saw-tooth signal.
Claim 8
Dependent Claim
93 words
A system as described in claim 5 in which the shifting means includes means connected to the first combining means for converting the digital signal representing K - E from the first combining means to provide control pulses, switching means connected to the coverting means and receiving the digital signals corresponding to the term A for shifting the received digital signals in accordance with the control pulses; and means connected to the switching means and to the second combining means for storing and providing the shifted digital signals to the second combining means.
Claim 9
Dependent Claim
67 words
A system as described in claim 6 further comprising means connected to the first combining means, to the switching means and to the storing means for controlling the switching means and the storing means so that the storing means provides digital signals to the second combining means having the same amplitude when the digital signal representing K - E corresponds to predetermined values for K - E.
Claim 10
Independent Claim
261 words
A method for providing final analog signals suitable for making a visible display, in accordance with the following equation: ein + or - AG E wherein ein represents the amplitude of a particular analog signal among a wide dynamic range of analog signals, A represents a matissa, G represents a radix of the number system used, and E represents an exponent and wherein G is a constant, which comprises providing digital signals forming a digital word for each analog signal in said range of analog signals, some of said signals in a digital word represent A and some represent E; generating a periodic analog reference signal Vref which has maximum and minimum signal levels; generating a digital signal corresponding to a number K, changing said K digital signal so aS to change the value of the number K each time Vref reaches its maximum level; combining the digital signals corresponding to K and E to produce another digital signal corresponding to (K - E); shifting the position of the digital signals corresponding to the term A in accordance with the K - E digital signal to produce another digital signal representing a modified A; combining the analog signal representing Vref and the signal representing a modified A to produce an analog signal Vo for each digital word; holding and filtering the analog signals Vo to produce corresponding final analog signals; summing the final analog signals to produce a sum signal; averaging the sum signal to provide an average signal; and providing said Vref signal as a function of the average signal.
Claim 11
Independent Claim
261 words
A method for providing final analog signals suitable for making a visible display, in accordance with the following equation: ein + or - AG E wherein ein represents the amplitude of a particular analog signal among a wide dynamic range of analog signals, A represents a matissa, G represents a radix of the number system used, and E represents an exponent and wherein G is a constant, which comprises providing digital signals forming a digital word for each analog signal in said range of analog signals, some of said signals in a digital word represent A and some represent E; generating a periodic analog reference signal Vref which has maximum and minimum signal levels; generating a digital signal corresponding to a number K, changing said K digital signal so aS to change the value of the number K each time Vref reaches its maximum level; combining the digital signals corresponding to K and E to produce another digital signal corresponding to (K - E); shifting the position of the digital signals corresponding to the term A in accordance with the K - E digital signal to produce another digital signal representing a modified A; combining the analog signal representing Vref and the signal representing a modified A to produce an analog signal Vo for each digital word; holding and filtering the analog signals Vo to produce corresponding final analog signals; summing the final analog signals to produce a sum signal; averaging the sum signal to provide an average signal; and providing said Vref signal as a function of the average signal.
Claim 12
Dependent Claim
18 words
A method as described in claim 8 further comprising the step of visibly displaying the final analog signals.
Claim 13
Independent Claim
289 words
A system for providing final analog signals suitable for making a visible display, in accordance with the following equation: ein + or - AG E wherein ein represents the amplitude of a particular analog signal among a wide dynamic range of analog signals, A represents a matissa, G represents a radix of the number system used and E represents an exponent and wherein G is a constant, comprising means for providing digital signals forming a digital word for each analog signal in said range of analog signals, some of said digital signals in each digital word represent A and some represent E; means for generating a periodic analog reference signal Vref which has maximum and minimum signal levels; means for generating a digital signal representing a number K and changing said digital signal and hence the number E each time Vref reaches its maximum level; means for combining the digital signals representing K and E to produce another digital signal representing (K - E); means for shifting the position of digital signals representing A in response to the digital signal representing (K - E) to produce another digital signal representing a modified A; means for combining the analog signal Vref and the signal representing a modified A to produce an analog signal Vo for each digital word; means for holding and filtering the analog signals Vo to produce corresponding final analog signals; means for summing the final analog signals and to providing a corresponding sum signal, means connected to the summing means and to the Vref signal generating means for averaging the sum signal and providing a corresponding average signal to the Vref generating means so that the Vref signal is generated as a function of the average signal.
Claim 14
Independent Claim
289 words
A system for providing final analog signals suitable for making a visible display, in accordance with the following equation: ein + or - AG E wherein ein represents the amplitude of a particular analog signal among a wide dynamic range of analog signals, A represents a matissa, G represents a radix of the number system used and E represents an exponent and wherein G is a constant, comprising means for providing digital signals forming a digital word for each analog signal in said range of analog signals, some of said digital signals in each digital word represent A and some represent E; means for generating a periodic analog reference signal Vref which has maximum and minimum signal levels; means for generating a digital signal representing a number K and changing said digital signal and hence the number E each time Vref reaches its maximum level; means for combining the digital signals representing K and E to produce another digital signal representing (K - E); means for shifting the position of digital signals representing A in response to the digital signal representing (K - E) to produce another digital signal representing a modified A; means for combining the analog signal Vref and the signal representing a modified A to produce an analog signal Vo for each digital word; means for holding and filtering the analog signals Vo to produce corresponding final analog signals; means for summing the final analog signals and to providing a corresponding sum signal, means connected to the summing means and to the Vref signal generating means for averaging the sum signal and providing a corresponding average signal to the Vref generating means so that the Vref signal is generated as a function of the average signal.
Claim 15
Dependent Claim
19 words
A system as described in claim 10 further comprising means for visibly displaying the final analog signals thus produced.
Claim 16
Dependent Claim
22 words
A system as described in claim 11 in which the means for providing signal Vref includes means for providing a saw-tooth signal.
Claim 17
Dependent Claim
92 words
A system as described in claim 12 in which the shifting means includes means connected to the first combining means for converting the K - E digital signal from the first combining means to provide control pulses, switching means connected to the converting means and receiving the digital signals corresponding to the term A for shifting the received digital signals in accordance with the control pulses; and means connected to the switching means and to the second combining means for storing and providing the shifted digital signals to the second combining means.
Claim 18
Dependent Claim
66 words
A system as described in claim 13 further comprising means connected to the first combining means to the switching means and to the storing means for controlling the switching means and the storing means so that the storing means Provides digital signals to the second combining means having the same amplitude when the (K - E) digital signal corresponds to predetermined values for K - E.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |