Patent US3715470A successfully refreshed from Google Patents.
US3715470A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color television camera encoder matrix with summation of two color video current signals and a constant current signal
Assignee: Telemation Inc
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Filing: 1971-03-29
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Granted: 1973-02-06
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Expires: 1991-03-29
Abstract
Abstract A method and apparatus for encoding color information from the video signals of a color television camera comprising a matrix including a current summing transistor which is supplied by a constant current source and two color signals which are applied in parallel with each other and with the constant current source. The third color signal is applied to vary the bias of the summing transistor in a manner to cause variations in the currents summed from the first two color signals. Identical circuits may be employed with only minor changes for encoding to derive both the I and Q video signals.
Inventors
- 👤 P Craig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:47
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/64; H04N9/67
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
140 words
A device for encoding color information from the video signals of a color television camera, said device comprising: a current summing transistor; a load resistor connected to said summing transistor to convert the current sum from said summing transistor into an output voltage; a constant current source connected to said summing transistor to supply current through said summing transistor; first and second precision resistors each connected to supply current to said summing transistor; first color video signal input means connected to said first precision resistor to apply signals through said first precision resistor; second color video signal input means connected to said second precision resistor to supply signals through said second precision resistor; and a third color video signal input means connected to the base of said summing transistor to apply signals to the base of said current summing transistor.
Claim 2
Independent Claim
140 words
A device for encoding color information from the video signals of a color television camera, said device comprising: a current summing transistor; a load resistor connected to said summing transistor to convert the current sum from said summing transistor into an output voltage; a constant current source connected to said summing transistor to supply current through said summing transistor; first and second precision resistors each connected to supply current to said summing transistor; first color video signal input means connected to said first precision resistor to apply signals through said first precision resistor; second color video signal input means connected to said second precision resistor to supply signals through said second precision resistor; and a third color video signal input means connected to the base of said summing transistor to apply signals to the base of said current summing transistor.
Claim 3
Independent Claim
140 words
A device for encoding color information from the video signals of a color television camera, said device comprising: a current summing transistor; a load resistor connected to said summing transistor to convert the current sum from said summing transistor into an output voltage; a constant current source connected to said summing transistor to supply current through said summing transistor; first and second precision resistors each connected to supply current to said summing transistor; first color video signal input means connected to said first precision resistor to apply signals through said first precision resistor; second color video signal input means connected to said second precision resistor to supply signals through said second precision resistor; and a third color video signal input means connected to the base of said summing transistor to apply signals to the base of said current summing transistor.
Claim 4
Independent Claim
140 words
A device for encoding color information from the video signals of a color television camera, said device comprising: a current summing transistor; a load resistor connected to said summing transistor to convert the current sum from said summing transistor into an output voltage; a constant current source connected to said summing transistor to supply current through said summing transistor; first and second precision resistors each connected to supply current to said summing transistor; first color video signal input means connected to said first precision resistor to apply signals through said first precision resistor; second color video signal input means connected to said second precision resistor to supply signals through said second precision resistor; and a third color video signal input means connected to the base of said summing transistor to apply signals to the base of said current summing transistor.
Claim 5
Dependent Claim
56 words
The device of claim 1 wherein: said first color video signal input means provides a green video input; said second color video signal input means provides a blue video input; said third color video signal input means provides a red video input; and said output voltage produced by said load resistor is a -I video output.
Claim 6
Dependent Claim
56 words
The device of claim 1 wherein: said first color video signal input means provides a red video input; said second color video signal input means provides a blue video input; said third color video signal input means provides a green video input; and said output voltage produced by said load resistor is a Q video output.
Claim 7
Dependent Claim
26 words
The device of claim 1 wherein: said first precision resistor has a value of 3,606 ohms; said second precision resistor has a value of 3,108 ohms.
Claim 8
Dependent Claim
26 words
The device of claim 1 wherein: said first precision resistor has a value of 4,695 ohms; said second precision resistor has a value of 3,204 ohms.
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) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |