Patent US3818364A successfully refreshed from Google Patents.
US3818364A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for varying the speed of evolution of an amplifier gain
Assignee: IFP Energies nouvelles
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Filing: 1972-08-24
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Granted: 1974-06-18
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Expires: 1992-08-24
Abstract
Abstract An amplifier of variable gain for amplifying signals whose amplitude vary during time, comprising an element for adding these signals to a program-signal, the amplitude of which is independent from the amplitude variations of said signals, means for attenuating the signal resulting from said addition of signals, with an attenuation factor depending on a control voltage, and means for generating said control voltage comprising means for isolating from the signal produced by said attenuating means the component thereof which corresponds to the programsignal, a substracting element for substracting from said component a reference signal produced by means for generating a voltage represented, as a function of time, by a curve formed of a continuous succession of straight line sections having slopes of predetermined values, and means for integrating the signal issued from the substracting element which produce said control voltage.
Inventors
- 👤 J Barret
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:20
CPC Classifications
H; H03; H03G; H03G7/00; H03G7/002; H03G7/005
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
163 words
An amplifier of variable gain for amplifying input signals whose amplitude vary during time, comprising first means for generating a program-signal having a maximal amplitude which is constant and independent from amplitude variations of the input signals, means for adding the input signals to said programsignal, means for attenuating the signals resulting from said addition of signals, said means for attenuating having an attenuation factor depending on a control voltage, and means for generating said control voltage comprising means for isolating from the signal produced by said attenuating means the component corresponding to the program-signal, means for generating a voltage represented as a function of time by a curve formed of a continuous succession of straight line sections having slopes of predetermined values, means for subtracting from said voltage represented by a continuous succession of straight line sections said component isolated from the isolating means, and means for integrating the signal issued from the subtracting means, said integrated signal producing said control voltage.
Claim 2
Dependent Claim
163 words
An amplifier of variable gain for amplifying input signals whose amplitude vary during time, comprising first means for generating a program-signal having a maximal amplitude which is constant and independent from amplitude variations of the input signals, means for adding the input signals to said programsignal, means for attenuating the signals resulting from said addition of signals, said means for attenuating having an attenuation factor depending on a control voltage, and means for generating said control voltage comprising means for isolating from the signal produced by said attenuating means the component corresponding to the program-signal, means for generating a voltage represented as a function of time by a curve formed of a continuous succession of straight line sections having slopes of predetermined values, means for subtracting from said voltage represented by a continuous succession of straight line sections said component isolated from the isolating means, and means for integrating the signal issued from the subtracting means, said integrated signal producing said control voltage.
Claim 3
Dependent Claim
20 words
A device according to claim 1, wherein said first means is a generator of direct voltage at a constant amplitude.
Claim 4
Dependent Claim
19 words
A device according to claim 1, wherein said first means is a generator of alternating voltage of constant amplitude.
Claim 5
Dependent Claim
28 words
A device according to claim 1, wherein said attenuating means consist of two identical attenuators connected in cascade and both connected to the output of the integrating means.
Claim 6
Dependent Claim
159 words
An amplifier of variable gain for amplifying signals whose amplitude vary during time, comprising means for generating a program-signal having a maximal amplitude which is independent from amplitude variations of the signals, means for adding the signals to the program-signal, means for attenuating the signals resulting from said addition of signals with an attenuation factor depending on a control voltage, and means for generating said control voltage comprising means for isolating from the signal produced by said attenuating means the component corresponding to said program-signal, means for memorizing binary digital signals, means for supplying to the memorizing means at predetermined moments at least one binary digital signal, means for converting said digital signals to analog signals, first mEans for integrating said analog signals as a function of time, means for substracting from said component the signal issued by said first integrating means, and second means for integrating the signal issued from the subtracting means which produces said control voltage.
Claim 7
Dependent Claim
159 words
An amplifier of variable gain for amplifying signals whose amplitude vary during time, comprising means for generating a program-signal having a maximal amplitude which is independent from amplitude variations of the signals, means for adding the signals to the program-signal, means for attenuating the signals resulting from said addition of signals with an attenuation factor depending on a control voltage, and means for generating said control voltage comprising means for isolating from the signal produced by said attenuating means the component corresponding to said program-signal, means for memorizing binary digital signals, means for supplying to the memorizing means at predetermined moments at least one binary digital signal, means for converting said digital signals to analog signals, first mEans for integrating said analog signals as a function of time, means for substracting from said component the signal issued by said first integrating means, and second means for integrating the signal issued from the subtracting means which produces said control voltage.
Claim 8
Dependent Claim
39 words
A device according to claim 5 wherein said means for supplying digital values to the memorizing means comprise means for storing a series of predetermined digital values and for transfering said values to the counting means at preselected moments.
Claim 9
Dependent Claim
108 words
A device according to claim 5 wherein said means for supplying digital values to the memorizing means comprise means for isolating from the signal produced by the attenuation means a second component corresponding to the signals of variable amplitude, means for amplifying said second component, means for determining a specific parameter of the signal produced by said amplifying means and means for comparing the value of said parameter to threshold-values, said comparing means being adapted to transfer to the memorizing means predetermined binary digital values which differ according to the direction of variation of said parameter values at the moments where they become equal to said threshold values.
Claim 10
Dependent Claim
38 words
A device according to claim 7, wherein the means for determining a specific parameter of the signal comprises an element for supplying a signal corresponding to the average energy level of the signal produced by the amplifying means.
Claim 11
Dependent Claim
37 words
A device according to claim 7 wherein the means for determining a specific parameter of the signal comprises an element for supplying a signal corresponding to the peak amplitude of the signal produced by the amplifying means.
Claim 12
Dependent Claim
48 words
A device according to claim 7, wherein the means for determining a specific parameter of the signal comprises an element for supplying a signal corresponding to the average of the absolute values, over a determined time interval, of the amplitude of the signal produced by the amplifying means.
Claim 13
Dependent Claim
23 words
A device according to claim 5, wherein said means for generating a program-signal is a generator of direct voltage with a constant amplitude.
Claim 14
Dependent Claim
22 words
A device according to claim 5, wherein said means for generating a program-signal is a generator of alternating voltage of constant amplitude.
Claim 15
Dependent Claim
29 words
A device according to claim 5, wherein said attenuating means consists of two identical attenuators connecting in cascade and both connected to the output of the second integrating means.
References Cited (Backward Citations)
GB554426A
Cited
US3337749A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |