US3969579A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Contrast, brightness and peaking control circuit
Assignee: GTE Sylvania Inc
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Filing: 1975-11-21
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Granted: 1976-07-13
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Expires: 1995-11-21
Abstract
Abstract A secondary control circuit including contrast control, brightness control, and a peaking circuit means are all disposed on a printed circuit board and coupled into the video circuit of a television receiver by one pair of connectors.
Inventors
- 👤 Robert Patrick Logan
- 👤 Robert Charles Wheeler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:21
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/44; H04N5/57
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
146 words
In a television receiver having a video signal channel, a secondary control circuit comprising: a potential source; first voltage divider means coupling said potential source to a potential reference level; second potential divider means including an adjustable brightness control means coupling said potential source to a potential reference level; adjustable contrast control means coupled to said first potential divider means and via parallel connected AC and DC coupling means to said second potential divider means; adjustable peaking control means directly connected to said second potential divider means and said parallel connected AC and DC coupling means and to a potential reference level; and a pair of connectors coupling said secondary control circuit to said video signal channel including a first connector coupling said video signal channel to said adjustable contrast control means and a second connector coupling said adjustable peaking means to said video signal channel.
Claim 2
Dependent Claim
146 words
In a television receiver having a video signal channel, a secondary control circuit comprising: a potential source; first voltage divider means coupling said potential source to a potential reference level; second potential divider means including an adjustable brightness control means coupling said potential source to a potential reference level; adjustable contrast control means coupled to said first potential divider means and via parallel connected AC and DC coupling means to said second potential divider means; adjustable peaking control means directly connected to said second potential divider means and said parallel connected AC and DC coupling means and to a potential reference level; and a pair of connectors coupling said secondary control circuit to said video signal channel including a first connector coupling said video signal channel to said adjustable contrast control means and a second connector coupling said adjustable peaking means to said video signal channel.
Claim 3
Dependent Claim
27 words
The secondary control circuit of claim 1 wherein said parallel connnected AC and DC coupling means is in the form of a parallel connected resistor and capacitor.
Claim 4
Dependent Claim
54 words
The secondary control circuit of claim 1 wherein said adjustable peaking control means is in the form of a switching means having a plurality of positional locations including a maximum positional location for directly coupling said second potential divider means and said parallel connected AC and DC coupling means to said video signal channel.
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) | 1979-07-13 | 1980-01-12 | 1980-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-13 | 1984-01-12 | 1984-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-13 | 1988-01-12 | 1988-07-13 | $7700.00 | Window Closed / Lapsed |