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US3697877A
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Methods and apparatus for generating electrical waveforms and quadraturephase trapezoidal and/or sinusoidal waveforms
Assignee: Lockheed Martin Corp
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Filing: 1971-02-08
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Granted: 1972-10-10
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Expires: 1991-02-08
Abstract
Abstract Conic generator apparatus controlled by a digital program source for tracing conic or eliptical patterns on a cathode ray tube CRT screen. The conic generator responds to a stop signal from the program source to simultaneously produce during a conic trace interval one cycle of a sine and a cosine wave. This is done by first producing a pair of quadrature phased trapezoidal waveforms. Next, the quadrature phased trapezoidal waveforms are converted to a pair of quadrature phased triangular waveforms which are then shaped to produce the sine and cosine waves. The quadrature phased trapezoidal waveforms are produced by controlling the linear charge and discharge of a pair of capacitors between high and low clamping limits.
Inventors
- 👤 James P Godfrey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:42
CPC Classifications
H; H03; H03K; H03K4/00; H03K4/94; H03B; H03B19/00; H03K4/06
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
59 words
The method of simultaneously producing a pair of quadrature phased triangular waveforms, comprising the steps of generating a pair of quadrature phased trapezoidal waveforms; summing said trapezoidal waveform pair to produce a first triangular waveform; and subtracting one of said trapezoidal waveforms from the other to produce a second triangular waveform in quadrature phase with said first triangular waveform.
Claim 2
Independent Claim
59 words
The method of simultaneously producing a pair of quadrature phased triangular waveforms, comprising the steps of generating a pair of quadrature phased trapezoidal waveforms; summing said trapezoidal waveform pair to produce a first triangular waveform; and subtracting one of said trapezoidal waveforms from the other to produce a second triangular waveform in quadrature phase with said first triangular waveform.
Claim 3
Independent Claim
72 words
The method of simultaneously producing a pair of sine and cosine waveforms comprising the steps of generating a pair of quadrature phased trapezoidal waveforms; summing said trapezoidal waveform pair to produce a first triangular waveform; subtracting one of said trapezoidal waveforms from the other to produce a second triangular waveform in quadrature phase with said first triangular waveform; and shaping said first and second triangular waveforms to produce sine and cosine waveforms.
Claim 4
Independent Claim
72 words
The method of simultaneously producing a pair of sine and cosine waveforms comprising the steps of generating a pair of quadrature phased trapezoidal waveforms; summing said trapezoidal waveform pair to produce a first triangular waveform; subtracting one of said trapezoidal waveforms from the other to produce a second triangular waveform in quadrature phase with said first triangular waveform; and shaping said first and second triangular waveforms to produce sine and cosine waveforms.
Claim 5
Independent Claim
109 words
The method of simultaneously producing first and second quadrature phase trapezoidal waveforms across first and second capacitors, respectively, comprising the steps of charging the first capacitor from a first to a second voltage level while clamping the second capacitor to the first voltage level; charging the second capacitor from the first to the second voltage level while clamping the first capacitor to the second voltage level; discharging the first capacitor from the second level to the first level while clamping the second capacitor to the second level; and discharging the second capacitor from the second level to the first level while clamping the first capacitor to the first level.
Claim 6
Independent Claim
109 words
The method of simultaneously producing first and second quadrature phase trapezoidal waveforms across first and second capacitors, respectively, comprising the steps of charging the first capacitor from a first to a second voltage level while clamping the second capacitor to the first voltage level; charging the second capacitor from the first to the second voltage level while clamping the first capacitor to the second voltage level; discharging the first capacitor from the second level to the first level while clamping the second capacitor to the second level; and discharging the second capacitor from the second level to the first level while clamping the first capacitor to the first level.
Claim 7
Dependent Claim
107 words
Waveform generating apparatus comprising first and second capacitors; means for charging the first and second capacitors in successive first and second time intervals, respectively, from a first to a second voltage level; means for discharging the first and second capacitors in successive third and fourth time intervals from the second to the first voltage level, where the third time interval follows the second time interval; means for clamping the first capacitor to the second and first voltage levels during the second and fourth time intervals; and means for clamping the second capacitor to the first and second voltage levels during the first and third time intervals, respectively.
Claim 8
Dependent Claim
107 words
Waveform generating apparatus comprising first and second capacitors; means for charging the first and second capacitors in successive first and second time intervals, respectively, from a first to a second voltage level; means for discharging the first and second capacitors in successive third and fourth time intervals from the second to the first voltage level, where the third time interval follows the second time interval; means for clamping the first capacitor to the second and first voltage levels during the second and fourth time intervals; and means for clamping the second capacitor to the first and second voltage levels during the first and third time intervals, respectively.
Claim 9
Dependent Claim
89 words
Waveform generating apparatus as set forth in claim 4 and further including a first circuit responsive to the equality of the voltage across the first capacitor with the second voltage level to initiate the start of the second time interval; a second circuit responsive to the equality of the voltages across both capacitors to initiate the start of the third interval; and a third circuit responsive to the equality of the voltage across the first capacitor with the first voltage level to initiate the start of the fourth interval.
Claim 10
Dependent Claim
51 words
Waveform generating apparatus as set forth in claim 5 wherein said second circuit includes means for enabling said charging circuit and inhibiting said discharging circuit during the first and second time intervals and for inhibiting said charging Circuit and enabling said discharging circuit during the third and fourth time intervals, respectively.
Claim 11
Dependent Claim
59 words
Waveform generating apparatus as set forth in claim 6 and further including means for summing the voltages across said first and second capacitors to produce a first triangular waveform; and means for taking the difference between the voltages developed across the first and second capacitors to produce a second triangular waveform in quadrature phase with the first triangular waveform.
Claim 12
Dependent Claim
29 words
Waveform generating apparatus as set forth in claim 7 and further including a shaper circuit for shaping said first and second triangular waveforms to produce sine and cosine waveforms.
Claim 13
Dependent Claim
51 words
Waveform generating apparatus comprising means for generating a pair of quadrature phased trapezoidal waveforms; means for summing said trapezoidal waveform pair to produce a first triangular waveform; and means for taking the difference between said trapezoidal waveforms to produce a second triangular waveform in quadrature phase with said first triangular waveform.
Claim 14
Dependent Claim
51 words
Waveform generating apparatus comprising means for generating a pair of quadrature phased trapezoidal waveforms; means for summing said trapezoidal waveform pair to produce a first triangular waveform; and means for taking the difference between said trapezoidal waveforms to produce a second triangular waveform in quadrature phase with said first triangular waveform.
Claim 15
Dependent Claim
27 words
Waveform generating apparatus as set forth in claim 9 and further including means for shaping said first and second triangular waveforms to produce sine and cosine waveforms.
Claim 16
Dependent Claim
27 words
Waveform generating apparatus comprising means for generating a pair of quadrature phased trapezoidal waveforms; and means for summing said trapezoidal waveform pair to produce a triangular waveform.
Claim 17
Dependent Claim
27 words
Waveform generating apparatus comprising means for generating a pair of quadrature phased trapezoidal waveforms; and means for summing said trapezoidal waveform pair to produce a triangular waveform.
Claim 18
Dependent Claim
29 words
Waveform generating apparatus comprising means for generating a pair of quadrature phased trapezoidal waveforms; and means for taking the difference between said trapezoidal waveforms to produce a triangular waveform.
Claim 19
Dependent Claim
29 words
Waveform generating apparatus comprising means for generating a pair of quadrature phased trapezoidal waveforms; and means for taking the difference between said trapezoidal waveforms to produce a triangular waveform.
Claim 20
Independent Claim
30 words
The method of producing a triangular waveform, comprising the steps of generating a pair of quadrature phased trapezoidal waveforms; and summing said trapezoidal waveform pair to produce said triangular waveform.
Claim 21
Independent Claim
30 words
The method of producing a triangular waveform, comprising the steps of generating a pair of quadrature phased trapezoidal waveforms; and summing said trapezoidal waveform pair to produce said triangular waveform.
Claim 22
Independent Claim
32 words
The method of producing a triangular waveform, comprising the steps of generating a pair of quadrature phased trapezoidal waveforms; and taking the difference between said trapezoidal waveforms to produce said triangular waveform.
Claim 23
Independent Claim
32 words
The method of producing a triangular waveform, comprising the steps of generating a pair of quadrature phased trapezoidal waveforms; and taking the difference between said trapezoidal waveforms to produce said triangular waveform.
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) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |