US3723907A
Expired / Lapsed
US
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Sync oscillator
Assignee: Computer Image Corp
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Filing: 1970-08-24
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Granted: 1973-03-27
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Expires: 1990-08-24
Abstract
Abstract An oscillator for generating a triangular waveform by alternately switching positive and negative DC signals to the input of an integrator in response to output signals from a flipflop, the flip-flop being responsive to selective peak values of the integrator output, and means for synchronizing the oscillator to begin oscillating in response to a sync pulse in any one of several phases.
Inventors
- 👤 E Tajchman
- 👤 J Brandt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:20
CPC Classifications
H; H03; H03K; H03K4/00; H03K4/06; H03K4/066
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
223 words
An oscillator which is reset in response to a sync pulse to begin oscillating in any of several phase variations which include a sine wave going positive, a sine wave going negative, a cosine wave going positive from a negative peak, and a cosine wave going negative from a positive peak, comprising an integrator means, means for alternately applying positive and negative DC signals to the input of the integrator means thereby producing a triangular wave at its output, means for selecting the phase in which the oscillator is to begin oscillating in response to the sync pulse, means for driving the output of the integrator to zero in response to the sync pulse when a sine phase is selected, means for driving the output of the integrator to a peak value in response to the sync pulse when a cosine phase is selected, means for applying the appropriate DC signal to the input of the integrator means to produce at the integrator output a positive going ramp at the conclusion of the sync pulse when a positive going phase is selected, and means for applying the appropriate DC signal to the input of the integrator means to produce at the output of the integrator a negative going ramp at the conclusion of the sync pulse when a negative going phase is selected.
Claim 2
Dependent Claim
223 words
An oscillator which is reset in response to a sync pulse to begin oscillating in any of several phase variations which include a sine wave going positive, a sine wave going negative, a cosine wave going positive from a negative peak, and a cosine wave going negative from a positive peak, comprising an integrator means, means for alternately applying positive and negative DC signals to the input of the integrator means thereby producing a triangular wave at its output, means for selecting the phase in which the oscillator is to begin oscillating in response to the sync pulse, means for driving the output of the integrator to zero in response to the sync pulse when a sine phase is selected, means for driving the output of the integrator to a peak value in response to the sync pulse when a cosine phase is selected, means for applying the appropriate DC signal to the input of the integrator means to produce at the integrator output a positive going ramp at the conclusion of the sync pulse when a positive going phase is selected, and means for applying the appropriate DC signal to the input of the integrator means to produce at the output of the integrator a negative going ramp at the conclusion of the sync pulse when a negative going phase is selected.
Claim 3
Dependent Claim
20 words
The oscillator of claim 1 including switch means for switching the DC signals to the input of the integrator means.
Claim 4
Dependent Claim
67 words
The oscillator of claim 2 wherein the alternately applying means includes a flip-flop, the switch means being responsive to the signal at one output of the flip-flop to apply one of the DC signals to the input of the integrator, and the switch means being responsive to the signal at another output of the flip-flop to apply the other DC signal to the input of the integrator.
Claim 5
Dependent Claim
118 words
The oscillator of claim 3 further coMprising means for selecting the amplitude of the integrator output signal which last-named means includes means for comparing the positive ramp signal from the integrator output with a first reference voltage, means for triggering the flip-flop to switch a DC signal of one polarity to the input of the integrator when the positive ramp signals and first reference voltage compare in predetermined correspondence, means for comparing the negative ramp signals from the integrator output with a second reference voltage, and means for triggering the flip-flop to switch the DC signal of opposite polarity to the input of the integrator when the negative ramp signals and second reference voltage compare in predetermined correspondence.
Claim 6
Dependent Claim
51 words
The oscillator of claim 1 wherein the second driving means further includes means for driving the output of the integrator to a peak value within the duration of the sync pulse in response to the sync pulse regardless of the slope of the integrator output signal before the sync pulse occurs.
Claim 7
Dependent Claim
74 words
The oscillator of claim 5 wherein the last-named driving means further comprises additional positive and negative DC signals of substantially greater amplitude than those alternately applied to the input of the integrator means, and means for applying the appropriate one of the substantially greater DC signals to the input of the integrator means for the duration of the sync pulse and in response to it in accordance with the polarity of the phase selected.
Claim 8
Independent Claim
128 words
A method of generating a triangular waveform which is reset in response to a sync pulse to begin oscillating in one of several phase variations which include a sine phase and a cosine phase, comprising the steps of alternately applying positive and negative DC signals to the input of an integrator means thereby producing a triangular wave at its output, selecting the phase in which the oscillator is to begin oscillating in response to the sync pulse from either a sine phase or cosine phase, driving the output of the integrator to zero in response to the sync pulse when a sine phase is selected, and driving the output of the integrator to a peak value in response to the sync pulse when a cosine phase is selected.
Claim 9
Independent Claim
128 words
A method of generating a triangular waveform which is reset in response to a sync pulse to begin oscillating in one of several phase variations which include a sine phase and a cosine phase, comprising the steps of alternately applying positive and negative DC signals to the input of an integrator means thereby producing a triangular wave at its output, selecting the phase in which the oscillator is to begin oscillating in response to the sync pulse from either a sine phase or cosine phase, driving the output of the integrator to zero in response to the sync pulse when a sine phase is selected, and driving the output of the integrator to a peak value in response to the sync pulse when a cosine phase is selected.
Claim 10
Dependent Claim
32 words
The method of claim 7 wherein the step of driving the output of the integrator to zero further comprises shorting the integrator input to its output when a sine phase is selected.
Claim 11
Dependent Claim
49 words
The method of claim 7 wherein the second driving step further includes driving the output of the integrator to a peak value within the duration of the sync pulse in response to the sync pulse regardless of the slope of the integrator output signal before the sync pulse occurs.
Claim 12
Dependent Claim
58 words
The method of claim 9 further comprising the step of applying a DC signal to the input of the integrator means, which DC signal is of substantially greater amplitude than those alternately applied to the input of the integrator means, for the duration of the sync pulse and in response to it when a cosine phase is selected.
Claim 13
Independent Claim
169 words
A method of generating a triangular waveform which is reset in response to a sync pulse to begin oscillating in any of several phase variations which include a positive going phase and a negative going phase, comprising the steps of alternately applying positive and negative DC signals to the input of an integrator means thereby producing a triangular wave at its output, selecting the phase in which the oscillator is to begin oscillating in response to the sync pulse from either a positive going phase or a negative going phase, applying the DC signal of appropriate polarity to the input of the integrator means to produce at the integrator output a positive going ramp at the conclusion of the sync pulse when a positive going phase is selected, and applying the DC signal of opposite polarity to the input of the integrator means to produce at the output of the integrator a negative going ramp at the conclusion of the sync pulse when a negative going phase is selected.
Claim 14
Independent Claim
169 words
A method of generating a triangular waveform which is reset in response to a sync pulse to begin oscillating in any of several phase variations which include a positive going phase and a negative going phase, comprising the steps of alternately applying positive and negative DC signals to the input of an integrator means thereby producing a triangular wave at its output, selecting the phase in which the oscillator is to begin oscillating in response to the sync pulse from either a positive going phase or a negative going phase, applying the DC signal of appropriate polarity to the input of the integrator means to produce at the integrator output a positive going ramp at the conclusion of the sync pulse when a positive going phase is selected, and applying the DC signal of opposite polarity to the input of the integrator means to produce at the output of the integrator a negative going ramp at the conclusion of the sync pulse when a negative going phase is selected.
References Cited (Backward Citations)
US3047820A
Cited
US3256426A
Cited
US3309507A
Cited
US3262069A
Cited
US3302132A
Cited
US3328724A
Cited
US3373377A
Cited
US3617769A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |