US3564222A
Expired / Lapsed
US
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Digital function generator solving the equation f(x) {32 {0 mx {30 {0 b
Assignee: Bendix Corp
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Filing: 1968-07-01
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Granted: 1971-02-16
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Expires: 1988-07-01
Abstract
Abstract The novel air data computer constructed according to the present invention has digital means which utilizes linear approximation techniques for computing air data parameters from air data curves. For each parameter the computer retrieves a slope m and an intercept b corresponding to a selected linear segment of an air data curve from a permanent memory and repetitively adds the retrieved slope m under control of an independent variable x corresponding to a sensed condition until the sum of the slopes equals the product mx of the slope and independent variable. The computer further adds the intercept b to the product mx in accordance with the following equation to provide a sum which is the dependent variable y corresponding to a point on an air data curve:
Inventors
- 👤 Salvatore J Dipaolo
- 👤 Casimir S Smialowicz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:10
CPC Classifications
G; G06; G06F; G06F7/00; G06F7/38; G06F7/48; G06F7/50; G06F7/504; G06F7/544; G06F7/5443
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
146 words
A computer for providing a digital output corresponding to a condition in accordance with a nonlinear equation, comprising means for sensing the condition and providing a signal corresponding thereto, means for storing slope and intercept constants corresponding to approximate linear segments of the nonlinear equation, a programmer connected to the storing means for selecting the constants of a pertinent linear segment of the nonlinear equation in accordance with the sensed condition, computing means, and control means connecting the sensing means, the storing means, and the programmer to the computing means for applying the condition signal from the sensing means and the constants of the linear segment from the storing means to the computing means in response to commands from the programmer for calculating the parameter in accordance with the pertinent linear segment to provide an output corresponding to the condition in accordance with the nonlinear equation.
Claim 2
Dependent Claim
146 words
A computer for providing a digital output corresponding to a condition in accordance with a nonlinear equation, comprising means for sensing the condition and providing a signal corresponding thereto, means for storing slope and intercept constants corresponding to approximate linear segments of the nonlinear equation, a programmer connected to the storing means for selecting the constants of a pertinent linear segment of the nonlinear equation in accordance with the sensed condition, computing means, and control means connecting the sensing means, the storing means, and the programmer to the computing means for applying the condition signal from the sensing means and the constants of the linear segment from the storing means to the computing means in response to commands from the programmer for calculating the parameter in accordance with the pertinent linear segment to provide an output corresponding to the condition in accordance with the nonlinear equation.
Claim 3
Dependent Claim
58 words
A computer as defined in claim 1 in which the storing means includes a permanent memory connected to the programmer containing the slope and intercept constants and two registers, and in which the programmer provides signals for transferring selected pertinent slope and intercept constants from the permanent memory to the registers for storage until completion of a calculation.
Claim 4
Dependent Claim
17 words
A digital computer as defined in claim 1 in which the computing means is a full adder/subtractor.
Claim 5
Dependent Claim
80 words
A computer as defined in claim 1 further comprising a first register connected to the sensing means, to the control means and to the computing means for storing signals corresponding to the condition and for storing data from the computing means in response to the control means, and a second register connected to the first register and to the control means receiving the condition signals from the first register and controlling the control means in accordance with the condition signals.
Claim 6
Dependent Claim
28 words
A digital computer as defined in claim 4 which further comprises a readout device connected to the first register for reading the data stored in the first register.
Claim 7
Dependent Claim
35 words
A digital computer as defined in claim 4 in which the control means includes switching means for controlling shifting of only one character or the entire contents of the first register to the second register.
Claim 8
Dependent Claim
125 words
A digital computer as defined in claim 6 in which the switching means includes a first AND gate connected to the programmer for passing a shift pulse from the programmer in response to an enabling command from the programmer, a second AND gate connected to the programmer for passing a pulse train from the programmer in response to another enabling command from the programmer, and a third AND gate connected to the first and second AND gates and to the first and second registers for controlling transfer of one character from the first register to the second register in response to the shift pulse or the transfer of the entire contents of the first register to the second register in response to the pulse train.
Claim 9
Dependent Claim
47 words
A digital computer as defined in claim 4 in which the control means includes switching means for recirculating the contents of the first register while preventing its contents from entering the computing means and preventing the resultant data from the computing means form entering the first register.
Claim 10
Dependent Claim
168 words
A digital computer as defined in claim 8 in which the switching means includes a first AND gate connected to the first register, to the programmer And to the computing means for passing the contents of the first register to the computing means in response to signals from the programmer; a second AND gate connected to the first AND gate, the second register and the computing means for passing the contents of the first register to the computing means in response to condition signals from the second register; a first AND gate connected to the computing means and to the first and second registers and controlling the passage of the data from the computing means to the first register in response to condition signals from the second register; and a second AND gate connected to an input and an output of the first register and to the second register and permitting recirculation of the contents of the first register in response to condition signals from the second register.
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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |