Patent US4051390A successfully refreshed from Google Patents.
US4051390A
Expired / Lapsed
US
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Parallel/time-shared variable time delay generator with common timing control and fast recovery
Assignee: United States Department of the Navy
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Filing: 1976-06-18
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Granted: 1977-09-27
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Expires: 1996-06-18
Abstract
Abstract A video-blanker system for supplying blanking pulses to receivers including main delay one-shot for responding to a pretrigger pulse and establishing a time delay in response thereto by providing an output pulse of a predetermined width and an auxiliary delay one-shot having its input AND coupled to the pretrigger pulse and to the output of the main delay one-shot for responding to pretrigger pulses occurring during the timing cycle of the main delay one-shot. The outputs of the main and auxiliary delay one-shots are trailing edge discriminated and OR coupled to initiate a pulse width one-shot which supplies the required blanking pulse. The main and auxiliary delay one-shots include means for reducing the recovery times thereof, without affecting the quasistable periods.
Inventors
- 👤 Charlie F. Reeves
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:39
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/02; G01S7/28; G01S7/285; G01S7/34
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
129 words
A system for providing output pulses of a predetermined width after a predetermined delay from the receipt of a pretrigger pulse including a non-retriggerable, main delay one-shot for receiving said pretrigger pulse and having a predetermined timing cycle for providing said predetermined delay, and further comprising: a first trailing edge discriminator connected to the output of said main delay one-shot; auxiliary delay means operably coupled to said main delay one-shot for responding to pretrigger pulses occurring during said main delay one-shot timing cycle when said predetermined delay is greater than said predetermined width; and a retriggerable pulse width one-shot connected to the output of said auxiliary delay means and operably coupled to the output of said first trailing edge discriminator for providing said output pulses of a predetermined width.
Claim 2
Independent Claim
129 words
A system for providing output pulses of a predetermined width after a predetermined delay from the receipt of a pretrigger pulse including a non-retriggerable, main delay one-shot for receiving said pretrigger pulse and having a predetermined timing cycle for providing said predetermined delay, and further comprising: a first trailing edge discriminator connected to the output of said main delay one-shot; auxiliary delay means operably coupled to said main delay one-shot for responding to pretrigger pulses occurring during said main delay one-shot timing cycle when said predetermined delay is greater than said predetermined width; and a retriggerable pulse width one-shot connected to the output of said auxiliary delay means and operably coupled to the output of said first trailing edge discriminator for providing said output pulses of a predetermined width.
Claim 3
Dependent Claim
108 words
The system of claim 1 in which said auxiliary delay means comprises: an AND gate having a first input connected to the input of said main delay one-shot and a second input connected to the output of said main delay one-shot; an auxiliary delay one-shot connected to the output of said AND gate; a trailing edge discriminator connected to the output of said auxiliary delay one-shot; and an OR gate having a first input connected to the output of said first trailing edge discriminator, a second input connected to the output of said second trailing edge discriminator and having its output connected to said retriggerable pulse width one-shot.
Claim 4
Dependent Claim
23 words
The system of claim 2 including a dual constant current source connected to both said main delay one-shot and said auxiliary delay one-shot.
Claim 5
Dependent Claim
33 words
The system of claim 3 wherein said dual constant current source includes control means for simultaneously controlling the pulse widths of the pulses generated by both said main delay and auxiliary delay one-shots.
Claim 6
Dependent Claim
151 words
The system of claim 3 wherein said main delay one-shot and said auxiliary delay one-shot include a main delay R-C timing circuit and an auxiliary delay R-C timing circuit respectively; said main delay R-C timing circuit including a first resistor, first means for reducing the recovery time of said main delay one-shot without affecting the quasistable period thereof, said first means having a first terminal connected to said first resistor, said main delay R-C timing circuit further including a first capacitor connected to a second terminal of said first means; and said auxiliary delay R-C timing circuit including a second resistor, second means for reducing the recovery time of said auxiliary delay one-shot without affecting the quasistable period thereof, said second means having a first terminal connected to said second resistor, said auxiliary delay R-C timing circuit further including a second capacitor connected to a second terminal of said second means.
Claim 7
Dependent Claim
57 words
The system of claim 5 wherein said first means comprises first and second transistors each having a base connected to said first resistor and an emitter connected to said first capacitor; and said second means comprises third and fourth transistors each having a base connected to said second resistor and an emitter connected to said second capacitor.
Claim 8
Dependent Claim
23 words
The system of claim 6 wherein said first and third transistors are NPN transistors and said second and fourth transistors are PNP transistors.
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) | 1980-09-26 | 1981-03-28 | 1981-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-26 | 1985-03-28 | 1985-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-26 | 1989-03-28 | 1989-09-27 | $7700.00 | Window Closed / Lapsed |