Patent US3875583A successfully refreshed from Google Patents.
US3875583A
Expired / Lapsed
US
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Circuit for modifying color characteristics
Assignee: Robert Bosch Fernsehanlagen GmbH
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Filing: 1973-07-31
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Granted: 1975-04-01
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Expires: 1993-07-31
Abstract
Abstract A circuit for modifying the color characteristics of a video signal by deriving a luminance signal which may have certain characteristics stressed, deriving color control signals according to the color system being used, multiplying the luminance signal by the control signals to derive two luminance control signals, and using the luminance control signals to modulate two respective quadrature-related carrier signals to derive a corrected video signal.
Inventors
- 👤 Dieter Poetsch
- 👤 Horst Peth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:30
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/64; H04N9/643
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
150 words
A circuit for modifying color characteristics of a picture produced from a color video signal by modifying the color video signal, comprising: A. means for deriving a luminance signal from the color video signal, B. matrix means responsive to three adjustable d.c. signals representing three color components for forming first and second correction signals, C. first and second multiplier means both responsive as one input to the luminance signal and respectively responsive as a second input to first and second color difference signals for respectively generating first and second product signals, D. means for modulating two quadrature components of a chrominance carrier signal derived from the color video signal respectively with the first and second product signals to derive first and second chrominance carrier components, and E. means for additively combining the first and second chrominance carrier components and the color video signal to derive a modified color video signal.
Claim 2
Dependent Claim
150 words
A circuit for modifying color characteristics of a picture produced from a color video signal by modifying the color video signal, comprising: A. means for deriving a luminance signal from the color video signal, B. matrix means responsive to three adjustable d.c. signals representing three color components for forming first and second correction signals, C. first and second multiplier means both responsive as one input to the luminance signal and respectively responsive as a second input to first and second color difference signals for respectively generating first and second product signals, D. means for modulating two quadrature components of a chrominance carrier signal derived from the color video signal respectively with the first and second product signals to derive first and second chrominance carrier components, and E. means for additively combining the first and second chrominance carrier components and the color video signal to derive a modified color video signal.
Claim 3
Dependent Claim
41 words
A circuit according to claim 1, further comprising means responsive to the luminance signal produced from the color video signal for feeding a version of the luminance signal, distorted in dependence upon its amplitude, to the first and second multiplier means.
Claim 4
Dependent Claim
64 words
A circuit according to claim 1 comprising A. several independent circuits for adjusting the color characteristics for providing parallel outputs, B. an adding stage responsive to the parallel outputs for providing the first and second product signals, and C. wherein the first and second multiplier means receives, in each case, a luminance signal which is distorted in different ways in dependence on the amplitude.
Claim 5
Dependent Claim
23 words
A circuit according to claim 1, further comprising the three potentiometer means for separately adjusting the three d.c. signals representing three color components.
Claim 6
Dependent Claim
25 words
A circuit according to claim 4 further comprising a mechanical device for coupling the three potentiometers, whereby they are adjustable with a single control stick.
Claim 7
Dependent Claim
55 words
A circuit according to claim 1 for use with an NTSC color television system wherein the matrix is constructed such that, from the three d.c. voltages representing three color components R, G and B, the d.c. voltages similar to the color difference signals have values such that they represent standard NTSC signals I and Q.
Claim 8
Dependent Claim
55 words
A circuit according to claim 1 for use with a PAL color television system wherein the matrix is constructed such that, from the three d.c. voltages representing three color components R, G and B, the d.c. voltages similar to the color difference signals have values such that they represent standard PAL signals U and V.
Claim 9
Dependent Claim
41 words
A circuit according to claim 1 further comprising means for deriving the chrominance carrier signal which is used to provide the two quadrature components in synchronization with bursts of the color video signal to be corrected as to the color characteristics.
Claim 10
Dependent Claim
26 words
A circuit according to claim 8, further comprising phase shifter means for adjusting the phase of the chrominance carrier used for deriving the two quadrature components.
Claim 11
Dependent Claim
52 words
A circuit according to claim 1, wherein, for the purpose of modifying the color characteristics of an FBAS color video signal produced according to the NTSC color television system, an additional voltage (FT), which is quadrature-modulated, likewise according to the NTSC color television system, is provided by means of the modulating means.
Claim 12
Dependent Claim
49 words
A circuit according to claim 1, wherein, for modifying the color characteristics of an FBAS color video signal produced according to the PAL color television system, an additional voltage (FT), which is quadrature-modulated, likewise according to the PAL color television system, is provided by means of the modulating means.
References Cited (Backward Citations)
US3604841A
Cited
US3737561A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |