US3783186A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic hue control and method
Assignee: Motorola Solutions Inc
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Filing: 1972-05-15
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Granted: 1974-01-01
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Expires: 1992-05-15
Abstract
Abstract In a three-color television receiver utilizing red, blue and green demodulators, variable phase shifting networks (or permanently phase shifted networks) are connected to supply to the red and blue demodulators reference signals with predetermined phases relative to the synchronizing signal. A reference signal is provided or the red and blue components of the chrominance signal are combined to form a negative green component and the positive green component is compared thereto to provide a source of signal for reducing the output of the red and blue component amplifiers when the positive green component exceeds the reference signal.
Inventors
- 👤 W Slavik
- 👤 B Valiquet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:43
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/64; H04N9/643
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
137 words
In a color television receiver adapted to receive a composite television signal including a chrominance signal, an improved automatic hue control comprising: a. first, second and third means connected to receive at least the chrominance signal and convert the chrominance signal to first, second and third color components thereof, respectively; b. first, second and third amplifying means coupled to said first, second and third means, respectively, for receiving and amplifying said first, second and third color components; c. comparing means having a reference signal applied to one input thereof and the third color component applied to a second input thereof for providing a comparison of the reference signal and the third color component; and d. means coupling said comparing means to said first and second amplifying means for adjusting the outputs thereof in response to the comparison.
Claim 2
Dependent Claim
137 words
In a color television receiver adapted to receive a composite television signal including a chrominance signal, an improved automatic hue control comprising: a. first, second and third means connected to receive at least the chrominance signal and convert the chrominance signal to first, second and third color components thereof, respectively; b. first, second and third amplifying means coupled to said first, second and third means, respectively, for receiving and amplifying said first, second and third color components; c. comparing means having a reference signal applied to one input thereof and the third color component applied to a second input thereof for providing a comparison of the reference signal and the third color component; and d. means coupling said comparing means to said first and second amplifying means for adjusting the outputs thereof in response to the comparison.
Claim 3
Dependent Claim
39 words
An improved automatic hue control as set forth in claim 1 wherein the television receiver includes apparatus energizeable to provide a noncircular demodulation curve and said automatic hue control includes switching means operable with the energization of said apparatus.
Claim 4
Dependent Claim
33 words
An improved automatic hue control as set forth in claim 1 wherein the first, second and third means are constructed to convert the chrominance signal to approximately red, blue and green components, respectively.
Claim 5
Dependent Claim
50 words
An improved automatic hue control as set forth in claim 1, wherein the third color component includes a positive green component, including in addition means coupled to the comparing means for combining the first and second color components to provide the reference signal including at least a negative green component.
Claim 6
Dependent Claim
44 words
An improved automatic hue control as set forth in claim 1 wherein the coupling means is connected to substantially reduce operation of the first and second amplifying means when the amplitude of the third color component substantially exceeds the amplitude of the combined signal.
Claim 7
Dependent Claim
19 words
An improved automatic hue control as set forth in claim 1 wherein the comparing means includes a differential amplifier.
Claim 8
Dependent Claim
33 words
An improved automatic hue control as set forth in claim 6 wherein the differential amplifier includes means for adjusting the bias on at least a part thereof to compensate for normal background color.
Claim 9
Dependent Claim
139 words
In a color television receiver adapted to receive a composite television signal including a chrominance signal, an improved automatic hue control compRising: a. first, second and third means connected to receive the chrominance signal and convert the chrominance signal to first, second and third color components thereof, respectively; b. first, second and third amplifying means coupled to said first, second and third means, respectively, for receiving and amplifying said first, second and third color components; c. comparing means coupled to said first and second means for receiving a combined signal, including the first and second color components, and third color component and for providing a comparison of the combined signal and the third color component; and d. means coupling said comparing means to said first and second amplifying means for adjusting the outputs thereof in response to the comparison.
Claim 10
Dependent Claim
139 words
In a color television receiver adapted to receive a composite television signal including a chrominance signal, an improved automatic hue control compRising: a. first, second and third means connected to receive the chrominance signal and convert the chrominance signal to first, second and third color components thereof, respectively; b. first, second and third amplifying means coupled to said first, second and third means, respectively, for receiving and amplifying said first, second and third color components; c. comparing means coupled to said first and second means for receiving a combined signal, including the first and second color components, and third color component and for providing a comparison of the combined signal and the third color component; and d. means coupling said comparing means to said first and second amplifying means for adjusting the outputs thereof in response to the comparison.
Claim 11
Dependent Claim
75 words
In a color television receiver adapted to receive a composite television signal including a chrominance signal, an improved method of automatically controlling the hue of the picture, comprising the steps of: a. converting the chrominance signal to first, second and third color components; b. providing a reference signal; c. comparing the reference signal to the third color component; and d. altering the amplitudes of the first and second color components in response to the comparison.
Claim 12
Dependent Claim
75 words
In a color television receiver adapted to receive a composite television signal including a chrominance signal, an improved method of automatically controlling the hue of the picture, comprising the steps of: a. converting the chrominance signal to first, second and third color components; b. providing a reference signal; c. comparing the reference signal to the third color component; and d. altering the amplitudes of the first and second color components in response to the comparison.
Claim 13
Dependent Claim
36 words
An improved method as set forth in claim 9 wherein the amplitudes of the first and second color components are reduced when the amplitude of the third color component exceeds the amplitude of the reference signal.
Claim 14
Dependent Claim
28 words
An improved method as set forth in claim 9 wherein the reference signal is generally a negative green and the third color component is generally a positive green.
Claim 15
Dependent Claim
82 words
In a color television receiver adapted to receive a composite television signal including a chrominance signal, an improved method of automatically controlling the hue of the picture, comprising the steps of: a. converting the chrominance signal to first, second and third color components; b. combining the first and second components to provide a combined component; c. comparing the combined component to the third color component; and d. altering the amplitudes of the first and second color components in response to the comparison.
Claim 16
Dependent Claim
82 words
In a color television receiver adapted to receive a composite television signal including a chrominance signal, an improved method of automatically controlling the hue of the picture, comprising the steps of: a. converting the chrominance signal to first, second and third color components; b. combining the first and second components to provide a combined component; c. comparing the combined component to the third color component; and d. altering the amplitudes of the first and second color components in response to the comparison.
References Cited (Backward Citations)
US2888514A
Cited
US3662097A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |