Patent US3895299A successfully refreshed from Google Patents.
US3895299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for automatic adjustment of AGC reference voltage
Assignee: Lockheed Martin Corp
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Filing: 1974-04-08
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Granted: 1975-07-15
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Expires: 1994-04-08
Abstract
Abstract In a system including an AGC circuit responsive to broadband RF signals, adjustment of the AGC circuit to maintain the signal in a particular incremental frequency band constant is achieved by monitoring the output from a receiver as the AGC reference voltage is intentionally changed and then generating an error voltage, if required.
Inventors
- 👤 Jr Irvin Bruce Tiedeman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:39
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/20; H03G3/30; H03G3/3052; H03G3/3073
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
140 words
In a system including an AGC circuit having an AGC reference voltage, broadband amplitude sensitive signal processing means coupled to said AGC circuit and a narrow-band receiver coupled to said signal processing means, apparatus for providing adjustment of the AGC reference voltage to maintain the input signal in a particular incremental frequency band constant as the spectrum of the input signal changes, comprising: means for generating a signal to increase and decrease the AGC reference level; means for applying said generated signal to the AGC circuit; means for monitoring the residual output from the receiver whereby if the level of the AGC Greference voltage is correct the residue monitored at the receiver output will increase equally during the increased and decreased AGC reference level; and means for adjusting the AGC circuit in accordance with the monitored output of the receiver.
Claim 2
Dependent Claim
140 words
In a system including an AGC circuit having an AGC reference voltage, broadband amplitude sensitive signal processing means coupled to said AGC circuit and a narrow-band receiver coupled to said signal processing means, apparatus for providing adjustment of the AGC reference voltage to maintain the input signal in a particular incremental frequency band constant as the spectrum of the input signal changes, comprising: means for generating a signal to increase and decrease the AGC reference level; means for applying said generated signal to the AGC circuit; means for monitoring the residual output from the receiver whereby if the level of the AGC Greference voltage is correct the residue monitored at the receiver output will increase equally during the increased and decreased AGC reference level; and means for adjusting the AGC circuit in accordance with the monitored output of the receiver.
Claim 3
Dependent Claim
35 words
Apparatus as defined in claim 1, wherein said means for adjusting the AGC circuit includes means for ascertaining the difference in residual output of the receiver due to increasing and decreasing the AGC reference voltage.
Claim 4
Dependent Claim
40 words
Apparatus as defined in claim 2, whereby said means for adjusting the AGC circuit further includes means for integrating the output from said difference ascertaining means and means for applying the output from said integrating means to the AGC circuit.
Claim 5
Dependent Claim
73 words
Apparatus defined in claim 3, wherein said means for ascertaining the difference in residual output of the receiver includes first and second sample and hold circuits coupled to the output of the receiver and means for enabling said sample and hold circuits by the signals from said means for generating a signal to increase and decrease the AGC reference level, and a subtractor coupled to the outputs of said sample and hold circuits.
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) | 1978-07-14 | 1979-01-13 | 1979-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-14 | 1983-01-13 | 1983-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-14 | 1987-01-13 | 1987-07-15 | $7700.00 | Window Closed / Lapsed |