Patent US3764923A successfully refreshed from Google Patents.
US3764923A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic pulse level control
Assignee: United States Department of the Navy
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Filing: 1972-03-22
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Granted: 1973-10-09
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Expires: 1992-03-22
Abstract
Abstract A pulse level control which detects the maximum video level change (contrast) present during the gate interval and designates this as the desired target so that the target may be sorted from the background present in the tracking gate. The control provides a constant pulse level output for a varying input level, which is accomplished by the use of digital circuitry in the pulse stretching portion of the control loop.
Inventors
- 👤 W Woodworth
- 👤 M Moulton
- 👤 J Whittington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:58
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/20; H03G3/30; H03G3/3036
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
185 words
An electrical circuit for providing output pulses in response to input signals and controlling the level of the output pulses of the circuit, comprising: means coupled to said input signals for converting changes in the input signal to electrical pulses; means coupled to said converting means for passing only the electrically positive portions of said electrical pulses; means coupled to said positive pulse passing means for combining a control signal and said positive pulses; means coupled to said positive pulse passing means for passing only those signals which occur during a preselected period; means coupled to said preselected period, pulse passing means for providing the circuit output, which output includes only those positive pulses occurring during the preselected period that have a maximum value greater than a preselected reference; and means coupled to said preselected period, pulse passing means for providing said control signal when the maximum value of the pulse passed by said preselected period, pulse passing means fails to fall within a preselected range, such that said control signal causes said maximum value of the pulse passed to return to said preselected range.
Claim 2
Dependent Claim
185 words
An electrical circuit for providing output pulses in response to input signals and controlling the level of the output pulses of the circuit, comprising: means coupled to said input signals for converting changes in the input signal to electrical pulses; means coupled to said converting means for passing only the electrically positive portions of said electrical pulses; means coupled to said positive pulse passing means for combining a control signal and said positive pulses; means coupled to said positive pulse passing means for passing only those signals which occur during a preselected period; means coupled to said preselected period, pulse passing means for providing the circuit output, which output includes only those positive pulses occurring during the preselected period that have a maximum value greater than a preselected reference; and means coupled to said preselected period, pulse passing means for providing said control signal when the maximum value of the pulse passed by said preselected period, pulse passing means fails to fall within a preselected range, such that said control signal causes said maximum value of the pulse passed to return to said preselected range.
Claim 3
Dependent Claim
97 words
The circuit of claim 1 wherein said control signal providing means includes: means for detecting the maximum value of the pulse passed by said preselected period, pulse passing means and providing an output when said detected maximum value fails to fall within said preselected range; means coupled to said detecting and providing means for providing a pulse output in response to the output of said detecting and providing means; and means coupled to said pulse output providing means for converting the pulse output to a linear, increasing electrical signal, which increasing electrical signal is said control signal.
Claim 4
Dependent Claim
41 words
The circuit of claim 2 wherein said control signal providing means further includes a pulse stretcher coupling said preselected period, pulse passing means to said detecting and providing means for stretching the pulse passed by said preselected period, pulse passing means.
Claim 5
Dependent Claim
47 words
The circuit of claim 2 wherein: said detecting and providing means is a plurality of digital comparators for comparing the maximum value of the pulse passed by said preselected period, pulse passing means to a reference; and said pulse output providing means is a plurality of flip-flops.
Claim 6
Dependent Claim
20 words
The circuit of claim 4 wherein each said comparator has a different reference value, and a respective flip-flop, associated therewith.
Claim 7
Dependent Claim
36 words
The circuit of claim 5 wherein each digital comparator provides an output when the maximum value of the pulse passed by said preselected period, pulse passing means exceeds the threshold value defined by its respective reference.
Claim 8
Dependent Claim
35 words
The circuit of claim 1 further comprising: an amplifier coupling said converting means to said positive pulse passing means; and an amplifier coupling said positive pulse passing means to said preselected period, pulse passing means.
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) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |