US4468631A
Expired / Lapsed
US
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Amplitude control apparatus
Assignee: RCA Corp
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Filing: 1982-05-24
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Granted: 1984-08-28
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Expires: 2002-05-24
Abstract
Abstract The DC component of an input signal is regulated at a constant amplitude to provide a resultant signal that is coupled to an output node via variable transmission means to provide a processed output signal. Feedback control means, coupled to the variable transmission means, regulates the DC component of the processed output signal linearly in accordance with the amplitude of a gain control signal thereby providing corresponding linear changes in the amplitude of the AC component of the processed output signal without need for linear transmission elements in the variable transmission means.
Inventors
- 👤 Selwyn B. Goldberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:58
CPC Classifications
H; H03; H03G; H03G1/00; H03G1/0005; H03G1/0035; H03G1/0047; H03G1/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
144 words
Amplitude control apparatus, comprising: input means for receiving an input signal and providing a resultant signal inclusive of an AC component proportional to amplitude variations of said input signal and a DC component of constant amplitude; an output node for providing a processed output signal; attenuator means having a series branch for coupling said resultant signal to said output node and a shunt branch for coupling said output node to a point of reference potential, each branch including an impedance element; and feedback control means having a first input coupled to said output node, a second input coupled to receive a gain control signal and an output for supplying a feedback control signal to at least one of said impedance elements for regulating the amplitude of the DC component of said processed output signal in accordance with the amplitude of said gain control signal.
Claim 2
Dependent Claim
144 words
Amplitude control apparatus, comprising: input means for receiving an input signal and providing a resultant signal inclusive of an AC component proportional to amplitude variations of said input signal and a DC component of constant amplitude; an output node for providing a processed output signal; attenuator means having a series branch for coupling said resultant signal to said output node and a shunt branch for coupling said output node to a point of reference potential, each branch including an impedance element; and feedback control means having a first input coupled to said output node, a second input coupled to receive a gain control signal and an output for supplying a feedback control signal to at least one of said impedance elements for regulating the amplitude of the DC component of said processed output signal in accordance with the amplitude of said gain control signal.
Claim 3
Dependent Claim
69 words
Amplitude control apparatus as recited in claim 1 wherein said feedback control means includes first filter means for separating said DC component from said processed output signal, differential amplifier means for developing a feedback signal from the separated DC component and said gain control signal, second filter means for smoothing said feedback signal and coupling means for coupling the smoothed feedback signal to said at least one impedance element.
Claim 4
Dependent Claim
37 words
Amplitude control apparatus as recited in claim 2 further comprising means for applying said smoothed feedback control signal to the impedance element of each branch in a sense to minimize output impedance variations at said output node.
References Cited (Backward Citations)
US3720880A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-08-28 | 1988-02-27 | 1988-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-28 | 1992-02-27 | 1992-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-28 | 1996-02-27 | 1996-08-28 | $7700.00 | Window Closed / Lapsed |