Patent US3727149A successfully refreshed from Google Patents.
US3727149A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Burst control circuit having a voltage responsive oscillator
Assignee: Shiba Electric Co Ltd
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Filing: 1971-08-25
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Granted: 1973-04-10
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Expires: 1991-08-25
Abstract
Abstract A burst control circuit for producing a continuous signal synchronized in phase with an intermittent burst signal and comprising a voltage-responsive control oscillator having a natural oscillation frequency, means for comparing the frequency the continous signal with the natural oscillation frequency of the control oscillator and means responsive to the output from the comparing means for producing an error signal and applying it to the oscillator to make equal the natural frequency of oscillation of the control oscillator with the continous signal.
Inventors
- 👤 K Kimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:28
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/79; H04N9/87; H04N9/8722; H04N9/44; H04N9/455
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
117 words
In combination, a burst control oscillator having a resonance circuit and connected to be triggered by a reproduced burst signal for producing a continuous burst signal, a limiter responsive to said continuous burst signal for producing a signal of constant amplitude, a filter connected to the output of said limiter, an envelope detector connected to the output of said filter, a clamping circuit for clamping the output of said detector, a gate circuit for gating the output from said clamping circuit and an integrating circuit responsive to the polarity of the output from said gate circuit for producing a control voltage for varying the frequency of natural resonance of the resonance circuit of said burst control oscillator.
Claim 2
Dependent Claim
117 words
In combination, a burst control oscillator having a resonance circuit and connected to be triggered by a reproduced burst signal for producing a continuous burst signal, a limiter responsive to said continuous burst signal for producing a signal of constant amplitude, a filter connected to the output of said limiter, an envelope detector connected to the output of said filter, a clamping circuit for clamping the output of said detector, a gate circuit for gating the output from said clamping circuit and an integrating circuit responsive to the polarity of the output from said gate circuit for producing a control voltage for varying the frequency of natural resonance of the resonance circuit of said burst control oscillator.
Claim 3
Dependent Claim
28 words
The combination according to claim 1 wherein said filter includes a crystal having a natural frequency of vibration slightly lower than the frequency of said reproduced burst signal.
Claim 4
Dependent Claim
36 words
The combination according to claim 1 wherein said clamping circuit is controlled by a clamp pulse generated by a clamp pulse generator which is triggered by a reproduced synchronizing signal isolated from a reproduced video signal.
Claim 5
Dependent Claim
36 words
The combination according to claim 1 wherein said gate circuit is controlled by a gate pulse generated by a gate pulse generator which is triggered by a reproduced synchronizing signal isolated from a reproduced video signal.
Claim 6
Dependent Claim
46 words
The combination according to claim 1 wherein said integrating circuit comprises a memory capacitor and a pair of switching transistors connected to charge and discharge said memory capacitor in response to the polarity of the pulse gated through said gate circuit for producing said control voltage.
Claim 7
Dependent Claim
58 words
The combination according to claim 1 wherein said burst control oscillator comprises a resonance circuit including a capacitor and an inductor, and a voltage responsive variable capacitance diode for controlling the frequency of natural resonance of said resonance circuit and wherein said control voltage produced by said integrating circuit is applied across said voltage responsive variable capacitance diode.
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) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |