Patent US3676655A successfully refreshed from Google Patents.
US3676655A
Expired / Lapsed
US
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Digital function generator for two independent variables with interpolation
Assignee: Colt Industries Operating Corp
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Filing: 1970-07-31
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Granted: 1972-07-11
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Expires: 1990-07-31
Abstract
Abstract A digital logic circuit for providing an output signal which is a function of a pair of independent variables is disclosed. The disclosed embodiment includes a two-dimensional function generator which operates as a pulse packet analyzer; the twodimensional function generator providing a binary output signal which is an arbitrary function of a third variable with respect to the actual value of a first variable and a known value of a second variable. The disclosed embodiment also includes circuitry for interpolating the regions between curves as represented by the output of the two-dimensional function generator, as a function of the difference between the actual and known values of the second independent variable, in order to provide a binary signal which may be added to the two-dimensional function generator output to produce the desired output signal.
Inventors
- 👤 Anthony Ancona
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:02
CPC Classifications
G; G06; G06F; G06F1/00; G06F1/02; G06F1/03; G06F1/035; G06F17/00; G06F17/10; G06F17/17; G06F17/175; G06F7/00; G06F7/60; G06F7/62; G06F7/64
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
244 words
A digital function generator comprising: first means responsive to input signals commensurate with actual values of first and second independent variables for generating a first control signal commensurate with the partial derivative of a third variable with respect to the first variable; second means responsive to said input signals commensurate with the actual values of the first and second independent variables for generating a second control signal commensurate with the partial derivative of the third variable with respect to the second variable; means providing a plurality of signals at different pulse repetition rates; means responsive to said first control signal and said plurality of pulsating signals for generating a first output signal commensurate with the value of the third variable with respect to the first variable for the actual value of the first variable and a predetermined value of the second variable; means responsive to said input signal commensurate with the actual value of the second variable for generating a signal commensurate with the difference between the actual value of the second variable and a preselected value of the second variable; means responsive to said second control signal and said difference signal for generating a second output signal commensurate with the difference between the value of said third variable as represented by said first output signal and the value of said third variable as a function of the actual value of said second variable; and means for summing said first and second output signals.
Claim 2
Dependent Claim
244 words
A digital function generator comprising: first means responsive to input signals commensurate with actual values of first and second independent variables for generating a first control signal commensurate with the partial derivative of a third variable with respect to the first variable; second means responsive to said input signals commensurate with the actual values of the first and second independent variables for generating a second control signal commensurate with the partial derivative of the third variable with respect to the second variable; means providing a plurality of signals at different pulse repetition rates; means responsive to said first control signal and said plurality of pulsating signals for generating a first output signal commensurate with the value of the third variable with respect to the first variable for the actual value of the first variable and a predetermined value of the second variable; means responsive to said input signal commensurate with the actual value of the second variable for generating a signal commensurate with the difference between the actual value of the second variable and a preselected value of the second variable; means responsive to said second control signal and said difference signal for generating a second output signal commensurate with the difference between the value of said third variable as represented by said first output signal and the value of said third variable as a function of the actual value of said second variable; and means for summing said first and second output signals.
Claim 3
Dependent Claim
72 words
The apparatus of claim 1 wherein said means for generating a first control signal commensurate with partial derivatives of the third variable with respect to the first variable comprises: a first storage device having information corresponding to known variations of the third variable with respect to the first variable for preselected variables of the second variable permanently recorded therein, said first control signal varying as the value of the first variable changes.
Claim 4
Dependent Claim
58 words
The apparatus of claim 2 wherein said means for generating a second control signal commensurate with partial derivatives of the third variable with respect to the second variable comprises: a second storage device having information corresponding to known variations of the third variable with respect to the second variable for values of the first variable permanently recorded therein.
Claim 5
Dependent Claim
63 words
The apparatus of claim 3 wherein said means for generating a first output signal comprises: logic circuit means responsive to said first control signal for passing preselected of said signals at different pulse repetition rates, said output signal pulse repetition rate varying with the first independent variable in accordance with a known function of said third variable with respect to said first variable.
Claim 6
Dependent Claim
66 words
The apparatus of claim 4 wherein said means for generating a second output signal comprises: means for multiplying the said second control signal by said signal commensurate with the difference between the actual valUe of said second variable and a preselected value of said second variable, said multiplying means interpolating the difference between known functions of said third variable as represented by said first output signal.
Claim 7
Dependent Claim
48 words
The apparatus of claim 5 wherein said multiplying means comprises: data storage means having information commensurate with the product of the partial derivative of said third variable with respect to said second variable and the difference between actual and known values of said second variable permanently stored therein.
Claim 8
Dependent Claim
75 words
The apparatus of claim 5 wherein said means for generating a first control signal further comprises: means responsive to pulse width modulated input signals commensurate with the first variable for generating pulse packets; first counter means for totalizing the pulses comprising each packet, the number in said counter means being delivered as an input to said first storage device; and means for clearing said counter means in the intervals between receipt of successive input signals.
Claim 9
Dependent Claim
57 words
The apparatus of claim 7 wherein said means for summing said first and second output signals comprises: second counter means for totalizing pulses delivered thereto; means for supplying the pulses at different frequencies passed by said logic circuit means to said second counter means; and means for delivering said second output signal to said second counter means.
Claim 10
Dependent Claim
127 words
The apparatus of claim 8 wherein said multiplying means comprises: a third data storage device having information commensurate with the product of the partial derivative of said third variable with respect to said second variable and the difference between actual and known values of said second variable permanently stored therein; pulse generator means connected to said third data storage device for providing a pulse packet commensurate with said product, the number of pulses in each packet being a function of the multiplication performed by said storage device; and means for interrogating said pulse generator means after said logic circuit means output signals have been loaded into said second counter means, said pulse generator means output pulses being loaded into said second counter means via said delivering means.
Claim 11
Dependent Claim
158 words
The apparatus of claim 9 wherein said pulse generator means comprises: third counter means connected to the output of said third data storage device, said third counter means being cleared and reloaded with the output of said storage device under the control of said interrogating means; gate circuit means, said gate circuit normally being in a closed state and having its control input connected to a preselected stage of said third counter means; free running oscillator means, said oscillator means providing pulses at a selected frequency to said counter means and to said gate means, clearing of said counter means removing the disabling input from said gate circuit means whereby said oscillator means output pulses will be passed to said delivering means until a sufficient number of said oscillator means pulses have been added to the number loaded in said third counter means from said third storage device to fill said third counter means to said preselected stage.
Claim 12
Independent Claim
117 words
A method of electrically simulating an arbitrary function for a variable Z with respect to a pair of independent variables X and Y comprising the steps of: generating a first binary signal commensurate with a first arbitrary function of Z with respect to the actual value of X and a known value of Y; providing a signal commensurate with the partial derivative of Z with respect to the actual value of Y for the actual value of X; multiplying the partial derivative by the difference between the actual value of Y and the known value of Y; generating a second binary signal commensurate with the product of said multiplication; and summing said first and second binarY signals.
Claim 13
Independent Claim
117 words
A method of electrically simulating an arbitrary function for a variable Z with respect to a pair of independent variables X and Y comprising the steps of: generating a first binary signal commensurate with a first arbitrary function of Z with respect to the actual value of X and a known value of Y; providing a signal commensurate with the partial derivative of Z with respect to the actual value of Y for the actual value of X; multiplying the partial derivative by the difference between the actual value of Y and the known value of Y; generating a second binary signal commensurate with the product of said multiplication; and summing said first and second binarY signals.
Claim 14
Dependent Claim
53 words
The method of claim 11 wherein the step of providing a signal commensurate with the partial derivative of Z with respect to Y comprises: employing the actual values of X and Y to look up the partial derivative in a memory device having data with respect to the values of Z stored therein.
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) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |