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US3602825A
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Pulse signal automatic gain control system including a resettable dump circuit
Assignee: GTE Sylvania Inc
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Filing: 1968-05-16
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Granted: 1971-08-31
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Expires: 1988-05-16
Abstract
Abstract The feedback circuit associated with the gain control element of this AGC system comprises a boxcar pulse stretcher including an automatic dump circuit. The pulse stretcher comprises a sample gate which controls application of input pulses to a storage capacitor. The dump circuit comprises a resettable dump pulse generator which produces control pulses that open a dump gate and discharge the capacitor. A sample pulse generator is responsive to input pulses for controlling operation of the dump generator and the sample gate. If the amplitude of an input pulse is greater than a first preset threshold level, the sample generator resets the dump generator to prevent discharge of the capacitor and opens the sample gate to enable the capacitor to charge to the amplitude of and to store the input pulse. If the amplitude of the next input pulse is greater than the first threshold, the sample generator again inactivates the dump generator and opens the sample gate to enable the capacitor to charge to the amplitude of and to store the new pulse. If the amplitude of the input pulse is less than the first threshold, the sample gate remains closed and the dump generator automatically opens the dump gate and discharges the capacitor after a prescribed time interval. If the voltage stored by the capacitor exceeds a second threshold level it is coupled to the gain control element to control the gain of the system.
Inventors
- 👤 W Senior Edwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:37
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/20; H03G3/30; H03G3/3036
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
198 words
A pulse signal automatic gain control system comprising a gain control element having an input terminal receiving input pulses, having an output terminal and having a control terminal, a first gate circuit having an input terminal connected to the output terminal of said gain control element, having an output terminal and having a control terminal, a first pulse generator having an input terminal connected to the output terminal of said gain control element and having an output terminal, first means connecting the output terminal of said first generator to the control terminal of said first gate, said first generator producing a first control pulse when an input pulse passed by said gain control element satisfies prescribed criteria, said first control pulse opening said first gate, means producing a second control pulse when the time interval between successive first control pulses is greater than a predetermined time interval, means sequentially storing input pulses passed by said first gate and being responsive to the second control pulses for changing the stored signal, and means coupling the stored signal to the control terminal of said gain control element when the amplitude of the stored signal exceeds a first prescribed threshold level.
Claim 2
Dependent Claim
198 words
A pulse signal automatic gain control system comprising a gain control element having an input terminal receiving input pulses, having an output terminal and having a control terminal, a first gate circuit having an input terminal connected to the output terminal of said gain control element, having an output terminal and having a control terminal, a first pulse generator having an input terminal connected to the output terminal of said gain control element and having an output terminal, first means connecting the output terminal of said first generator to the control terminal of said first gate, said first generator producing a first control pulse when an input pulse passed by said gain control element satisfies prescribed criteria, said first control pulse opening said first gate, means producing a second control pulse when the time interval between successive first control pulses is greater than a predetermined time interval, means sequentially storing input pulses passed by said first gate and being responsive to the second control pulses for changing the stored signal, and means coupling the stored signal to the control terminal of said gain control element when the amplitude of the stored signal exceeds a first prescribed threshold level.
Claim 3
Dependent Claim
93 words
The system according to claim 1 wherein said second control pulse producing means comprises a second pulse generator having an input terminal connected to the output terminal of said first generator and having an output terminal, said second generator producing second control pulses having a pulse repetition frequency equal to the reciprocal of the predetermined time interval and being responsive to first control pulses for resetting the time of generation of second control pulses, and second means connecting the output terminal of said second generator to the control terminal of said first gate.
Claim 4
Dependent Claim
17 words
The system according to claim 2 wherein said first and second connecting means each comprise a diode.
Claim 5
Dependent Claim
130 words
The system according to claim 1 wherein said second control pulse producing means comprises a third pulse generator having an input terminal connected to the output terminal of said first generator and having an output terminal, said third generator producing second control pulses having a pulse repetition frequency equal to the reciprocal of the predetermined time interval and being responsive to first control pulses for resetting the time of generation of second control pulses, and a second gate circuit having a first terminal connected to a reference potential, having a second terminal coupled to said storage means and having a third terminal connected to the output terminal of said third generator, said second gate being responsive to the second control pulses for dumping the signal stored bY said storage means.
Claim 6
Dependent Claim
46 words
The system according to claim 4 wherein said third pulse generator comprises a free-running oscillator producing a train of second control pulses, and an inhibit circuit responsive to first control pulses for resetting said oscillator to change the time of generation of succeeding second control pulses.
Claim 7
Dependent Claim
33 words
The system according to claim 1 wherein said first pulse generator comprises a first threshold detector which changes operating states when the amplitude of an input pulse exceeds a second prescribed threshold level.
Claim 8
Dependent Claim
58 words
The system according to claim 6 wherein said first pulse generator includes a second threshold detector which changes operating states when the amplitude of the derivative of an input pulse crosses a third prescribed threshold level, and a circuit for logically combining the output signals of said first and second detector circuits for producing the first control signal.
Claim 9
Dependent Claim
80 words
A pulse stretcher comprising first means sequentially selectively passing input pulses satisfying prescribed criteria, second means responsive to the operation of said first means and continuously producing first control pulses at a prescribed rate whenever the time intervals between successive input pulses passed by said first means are greater than a predetermined time interval, and means sequentially storing input pulses passed by said first means and responsive to generation of said first control pulses for changing the signal stored thereby.
Claim 10
Dependent Claim
80 words
A pulse stretcher comprising first means sequentially selectively passing input pulses satisfying prescribed criteria, second means responsive to the operation of said first means and continuously producing first control pulses at a prescribed rate whenever the time intervals between successive input pulses passed by said first means are greater than a predetermined time interval, and means sequentially storing input pulses passed by said first means and responsive to generation of said first control pulses for changing the signal stored thereby.
Claim 11
Dependent Claim
96 words
The pulse stretcher according to claim 8 wherein said first means is responsive to input pulses satisfying the prescribed criteria for producing second control pulses, said second means comprising a pulse generator producing the first control pulses which have a natural pulse repetition frequency equal to the reciprocal of the predetermined time interval, said generator being responsive to the second control pulses for resetting said generator and changing the time of generation of first control pulses thereby, and a gate circuit responsive to a first control pulse for dumping the signal stored by said storage means.
Claim 12
Dependent Claim
39 words
The pulse stretcher according to claim 9 wherein said first means comprises a threshold detector receiving input pulses and changing operating states when the amplitude of the derivative of an input pulse is less than a prescribed threshold level.
Claim 13
Dependent Claim
243 words
A pulse stretcher comprising first means sequentially selectively passing input pulses satisfying prescribed criteria, second means responsive to the operation of said first means and producing a first control pulse when the time interval between successive input pulses passed by said first means is greater than a predetermined time interval, and means sequentially storing input pulses passed by said first means and responsive to generation of said first control pulse for changing the signal stored thereby, said first means being responsive to input pulses satisfying the prescribed criteria for producing second control pulses, said first means comprising a first threshold detector receiving input pulses and changing operating states when the amplitude of the derivative of an input pulse is less than a first prescribed threshold level, a second threshold detector responsive to input pulses for changing operating states when the amplitude of an input pulse exceeds a second prescribed threshold level, and a circuit for logically combining the output signals of said first and second detectors for producing the second control pulses, said second means comprising a pulse generator producing the first control pulses which have a natural pulse repetition frequency equal to the reciprocal of the predetermined time interval, said generator being responsive to the second control pulses for resetting said generator and changing the time of generation of first control pulses thereby, and a gate circuit responsive to a first control pulse for dumpIng the signal stored by said storage means.
Claim 14
Dependent Claim
243 words
A pulse stretcher comprising first means sequentially selectively passing input pulses satisfying prescribed criteria, second means responsive to the operation of said first means and producing a first control pulse when the time interval between successive input pulses passed by said first means is greater than a predetermined time interval, and means sequentially storing input pulses passed by said first means and responsive to generation of said first control pulse for changing the signal stored thereby, said first means being responsive to input pulses satisfying the prescribed criteria for producing second control pulses, said first means comprising a first threshold detector receiving input pulses and changing operating states when the amplitude of the derivative of an input pulse is less than a first prescribed threshold level, a second threshold detector responsive to input pulses for changing operating states when the amplitude of an input pulse exceeds a second prescribed threshold level, and a circuit for logically combining the output signals of said first and second detectors for producing the second control pulses, said second means comprising a pulse generator producing the first control pulses which have a natural pulse repetition frequency equal to the reciprocal of the predetermined time interval, said generator being responsive to the second control pulses for resetting said generator and changing the time of generation of first control pulses thereby, and a gate circuit responsive to a first control pulse for dumpIng the signal stored by said storage means.
Claim 15
Dependent Claim
239 words
A pulse stretcher comprising first means sequentially selectively passing input pulses satisfying prescribed criteria, second means responsive to the operation of said first means and producing a first control pulse when the time interval between successive input pulses passed by said first means is greater than a predetermined time interval, and means sequentially storing input pulses passed by said first means and responsive to generation of said first control pulse for changing the signal stored thereby, said first means comprising a gate circuit having an input terminal receiving input pulses, having an output terminal and having a control terminal, and a first pulse generator having an input terminal receiving input pulses and having an output terminal electrically coupled to the control terminal of said gate, said first generator being responsive to an input pulse satisfying the prescribed criteria for producing a second control pulse which opens said gate to connect the input pulse to said storage means, said second means comprising a second pulse generator having an input terminal connected to the output terminal of said first generator and having an output terminal electrically coupled to the control terminal of said gate, said second generator producing the first control pulses which have a natural pulse repetition frequency equal to the reciprocal of the predetermined time interval, said second generator being responsive to second control pulses for resetting the second generator and the time of generation of first pulses thereby.
Claim 16
Dependent Claim
239 words
A pulse stretcher comprising first means sequentially selectively passing input pulses satisfying prescribed criteria, second means responsive to the operation of said first means and producing a first control pulse when the time interval between successive input pulses passed by said first means is greater than a predetermined time interval, and means sequentially storing input pulses passed by said first means and responsive to generation of said first control pulse for changing the signal stored thereby, said first means comprising a gate circuit having an input terminal receiving input pulses, having an output terminal and having a control terminal, and a first pulse generator having an input terminal receiving input pulses and having an output terminal electrically coupled to the control terminal of said gate, said first generator being responsive to an input pulse satisfying the prescribed criteria for producing a second control pulse which opens said gate to connect the input pulse to said storage means, said second means comprising a second pulse generator having an input terminal connected to the output terminal of said first generator and having an output terminal electrically coupled to the control terminal of said gate, said second generator producing the first control pulses which have a natural pulse repetition frequency equal to the reciprocal of the predetermined time interval, said second generator being responsive to second control pulses for resetting the second generator and the time of generation of first pulses thereby.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-30 | 1975-03-01 | 1975-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-30 | 1979-03-01 | 1979-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-30 | 1983-03-01 | 1983-08-31 | $7700.00 | Window Closed / Lapsed |