US3562410A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color tone control networks for color television receivers
Assignee: Electrohome Ltd
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Filing: 1968-06-19
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Granted: 1971-02-09
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Expires: 1988-06-19
Abstract
Abstract The color tone of images reproduced by a color television receiver is changed by varying the ratio of the amplitudes of at least two different color hue signals translated by the chrominance signal channel of the receiver prior to matrixing with the luminance signal.
Inventors
- 👤 John D Lovely
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:28
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/64; H04N9/68
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
136 words
In a receiver for reproducing monochrome and colour images of televised scenes of a type having a chrominance signal channel, a luminance signal channel, a picture tube having a plurality of electron guns each including a cathode and grid electrode, means connecting said channels to said electron guns to supply signals translated by said channels to said electron guns, said luminance signal channel including means for varying the magnitude of the luminance signal translated by said luminance signal channel to vary the brightness of said images, the improvement comprising colour tone control means for varying the colour tone of said images, said colour tone control means comprising means for varying the ratio of the amplitudes of at least two different colour hue signals translated by said chrominance signal channel prior to matrixing with said luminance signal.
Claim 2
Dependent Claim
136 words
In a receiver for reproducing monochrome and colour images of televised scenes of a type having a chrominance signal channel, a luminance signal channel, a picture tube having a plurality of electron guns each including a cathode and grid electrode, means connecting said channels to said electron guns to supply signals translated by said channels to said electron guns, said luminance signal channel including means for varying the magnitude of the luminance signal translated by said luminance signal channel to vary the brightness of said images, the improvement comprising colour tone control means for varying the colour tone of said images, said colour tone control means comprising means for varying the ratio of the amplitudes of at least two different colour hue signals translated by said chrominance signal channel prior to matrixing with said luminance signal.
Claim 3
Dependent Claim
51 words
The invention according to claim 1 wherein said chrominance signal channel includes a red hue signal demodulator and a blue hue signal demodulator, said colour tone control means comprising means for varying the gain of at least one of said demodulators relative to the gain of the other of said demodulators.
Claim 4
Dependent Claim
50 words
The invention according to claim 1 wherein said chrominance signal channel includes a red hue signal demodulator and a blue hue signal demodulator, said colour tone control means comprising means for simultaneously increasing the gain of one of said demodulators and decreasing the gain of the other of said demodulators.
Claim 5
Dependent Claim
55 words
The invention according to claim 3 wherein said demodulators comprise electron discharge devices each having plate, cathode and grid electrodes, said colour tone control meaNs comprising a potentiometer having a slider, said potentiometer being connected between said cathode electrodes of said electron discharge devices, said slider being connected to a terminal at a reference potential.
Claim 6
Dependent Claim
49 words
The invention according to claim 3 wherein said demodulators comprise electron discharge devices each having plate, cathode and grid electrodes, said colour tone control means comprising a potentiometer having a slider, said potentiometer being connected between said plate electrodes, said slider being connected to a source of DC potential.
Claim 7
Dependent Claim
90 words
The invention according to claim 1 wherein said chrominance signal channel includes a red hue signal demodulator and a blue hue signal demodulator, said demodulators each comprising electron discharge devices each having plate, cathode and grid electrodes, said grid electrodes of said electron discharge devices being connected in said chrominance signal channel, said colour tone control means comprising a variable impedance device connected in circuit with one of said grid electrodes of said electron discharge devices for varying the amplitude of the chrominance signal supplied to said one grid electrode.
Claim 8
Dependent Claim
30 words
The invention according to claim 1 wherein said colour tone control means comprise means for varying the angle between the axes of demodulation of said two different colour hue signals.
Claim 9
Dependent Claim
103 words
The invention according to claim 7 wherein said chrominance signal channel includes a red hue signal demodulator and a blue hue signal demodulator, said demodulators each comprising electron discharge devices each having plate, cathode and grid electrodes, said receiver also including a reference oscillator connected to supply reference oscillations to one of said grid electrodes of each of said electron discharge devices, said colour tone control mean means comprising means for varying the phase of said reference oscillations supplied to one of said electron discharge devices relative to the phase of said reference oscillations supplied to the other of said electron discharge devices.
Claim 10
Dependent Claim
74 words
The invention according to claim 7 wherein said chrominance signal channel includes a red hue signal demodulator and a blue hue signal demodulator, said receiver also including a reference oscillator connected to supply reference oscillations to said demodulators, said colour tone control means comprising means for varying the phase of said reference oscillations supplied to one of said demodulators relative to the phase of said reference oscillations supplied to the other of said demodulators.
Claim 11
Dependent Claim
55 words
The invention according to claim 1 wherein said chrominance signal channel includes red and blue hue signal demodulators and red and blue hue signal amplifiers connected thereto, said colour tone control means comprising means for varying the gain of at least one of said amplifiers relative to the gain of the other of said amplifiers.
Claim 12
Dependent Claim
57 words
The invention according to claim 10 wherein said amplifiers comprise electron discharge devices having plate, cathode and grid electrodes, said colour tone control means comprising a potentiometer having a slider, said potentiometer being connected between said cathode electrodes of said electron discharge devices, said slider being connected via a capacitor to a terminal at a reference potential.
Claim 13
Dependent Claim
46 words
The invention according to claim 1 wherein said chrominance signal channel includes red, blue and green hue signal amplifiers, said colour tone control means comprising means for varying the gain of at least one of said amplifiers relative to the gain of another of said amplifiers.
Claim 14
Dependent Claim
26 words
The invention according to claim 12 wherein said red, blue and green hue signals are colour difference signals and said amplifiers are colour difference signal amplifiers.
Claim 15
Dependent Claim
28 words
The invention according to claim 2 wherein said red hue signal is a red colour difference signal and said blue hue signal is a blue colour difference signal.
Claim 16
Dependent Claim
17 words
The invention according to claim 1 wherein said two different colour Hue signals are colour difference signals.
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) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |