Patent US3832483A successfully refreshed from Google Patents.
US3832483A
Expired / Lapsed
US
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Line sequential color video encoding with equally contributed luminance
Assignee: Zenith Electronics LLC
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Filing: 1972-12-27
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Granted: 1974-08-27
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Expires: 1992-12-27
Abstract
Abstract An encoding system for color television signals wherein three color-difference signals representative of the color of a scene and a luminance signal representative of the brightness of the scene are encoded as three-line sequential signals with relative amplitudes such that when the three sequential signals are matrixed in equal proportions a luminance signal is formed representative of the average luminance level of the picture over the preceding three lines.
Inventors
- 👤 H Jirka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:53
CPC Classifications
H; H04; H04N; H04N11/00; H04N11/06; H04N11/20; H04N11/22; H04N9/00; H04N9/79; H04N9/80; H04N9/86
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
155 words
A translation system comprising: a source of encoded color television signal, said signal comprising a luminance component representative of the brightness of a scene, a plurality of generalized color difference components representative of the chromaticity of the scene and a reference component, said color television signal being encoded in three line sequential signals of the form Y + Ka(C1 - Y), Y + Kb(C2 - Y) and Y - Ka(C1 - Y) Kb(C2 - Y) so that the average of said sequential signals yields said luminance component, and where Ka and Kb are constants; and, conversion means, including a first matrix means for combining equal portions of said line sequential signals to derive said luminance component, said conversion means being coupled to said source and operable under control of said reference component for converting said line sequential encoded signals into a composite color signal of a type suitable for application to a color television receiver.
Claim 2
Dependent Claim
155 words
A translation system comprising: a source of encoded color television signal, said signal comprising a luminance component representative of the brightness of a scene, a plurality of generalized color difference components representative of the chromaticity of the scene and a reference component, said color television signal being encoded in three line sequential signals of the form Y + Ka(C1 - Y), Y + Kb(C2 - Y) and Y - Ka(C1 - Y) Kb(C2 - Y) so that the average of said sequential signals yields said luminance component, and where Ka and Kb are constants; and, conversion means, including a first matrix means for combining equal portions of said line sequential signals to derive said luminance component, said conversion means being coupled to said source and operable under control of said reference component for converting said line sequential encoded signals into a composite color signal of a type suitable for application to a color television receiver.
Claim 3
Dependent Claim
27 words
A translation system as set forth in claim 1 wherein Ka(C1 -Y) K1(R - Y), Kb(C2 - Y) K4(B - Y) and K1 and K4 are constants.
Claim 4
Dependent Claim
15 words
A translation system as set forth in claim 2 wherein K1 30/59 and K4 11/59.
Claim 5
Dependent Claim
30 words
A translAtion system as set forth in claim 1 wherein said conversion means comprise: oscillation means and delay line means for making said sequential signals simultaneously available in modulated form.
Claim 6
Dependent Claim
26 words
A translation system as set forth in claim 4 wherein said oscillation means has a frequency equal to the color subcarrier required by said television receiver.
Claim 7
Dependent Claim
39 words
A translation system as set forth in claim 5 further including a second matrix means and a switch means for selecting the simultaneously available modulation signals for application to said second matrix means under control of said reference component.
Claim 8
Dependent Claim
47 words
A translation system as set forth in claim 6 wherein said luminance component is derived from said switch means in modulated form and further including a detector for demodulating said luminance component; and circuit means combining the outputs of said detector and of said second matrix means.
Claim 9
Dependent Claim
43 words
A translation system as set forth in claim 6 in which said luminance component in said source includes a continuous high frequency portion, and which further comprises means for confining said generalized color difference components to the lower portion of the total bandwidth.
Claim 10
Dependent Claim
34 words
A translation system as set forth in claim 8 wherein said conversion means includes a high pass filter coupled to said circuit means for bypassing said high frequency luminance portion around said switch means.
Claim 11
Independent Claim
93 words
The method of encoding a color television signal comprising the steps of: A. deriving a plurality of primary color signals each representative of a different color characteristic of a scene; B. deriving a luminance signal; C. deriving a plurality of generalized color difference components from said primary color signals; and D. encoding said luminance signal and said components into three sequential signals each consisting of the sum of said luminance signal and a color difference component such that the algebraic addition of equal parts of said three sequential signals yields said luminance signal.
Claim 12
Independent Claim
93 words
The method of encoding a color television signal comprising the steps of: A. deriving a plurality of primary color signals each representative of a different color characteristic of a scene; B. deriving a luminance signal; C. deriving a plurality of generalized color difference components from said primary color signals; and D. encoding said luminance signal and said components into three sequential signals each consisting of the sum of said luminance signal and a color difference component such that the algebraic addition of equal parts of said three sequential signals yields said luminance signal.
Claim 13
Dependent Claim
31 words
The method as set forth in claim 10 wherein steps B and C includes matrixing said primary color signals to derive said luminance signal and a pair of color difference components.
Claim 14
Dependent Claim
29 words
The method as set forth in claim 11 which further includes the step of confining said color difference components to the lower frequency portion of the luminance signal bandwidth.
Claim 15
Dependent Claim
34 words
The method as set forth in claim 12 which further includes the step of confining said luminance signal bandwidth to less than 4MHz and confining said lower frequency portion to less than approximately 600KHz.
Claim 16
Dependent Claim
20 words
The method as set forth in claim 11 wherein said pair of color difference components are primary color difference signals.
Claim 17
Dependent Claim
33 words
The method as set forth in claim 14 further including the step of weighting said pair of primary color difference components and combining the weighted pair to produce a third color difference component.
Claim 18
Dependent Claim
26 words
The method as set forth in claim 15 wherein said three sequential signals are formed by switching said color difference components and adding said luminance signal.
Claim 19
Dependent Claim
22 words
The method as set forth in claim 16 wherein said primary color difference components are R - Y and B - Y.
Claim 20
Dependent Claim
34 words
The method as set forth in claim 17 wherein said sequential signals are: Sa Y + 30/59(R - Y) Sb Y + 11/59(B - Y) Sc Y -30/59(R - Y) - 11/59(B - Y).
Claim 21
Independent Claim
117 words
A system for encoding and decoding color television signals in the form of color difference components primarily representative of the chromaticity of a scene, and a luminance component representative of the brightness of the scene, said system comprising: means for cyclically combining said color difference components with said luminance component to form line sequentially encoded signals, which when algebraically added in eQual proportions yields said luminance component; signal translation means; means for applying said line sequentially encoded signals to said signal translation means; signal delaying means coupled to said translation means for rendering said line sequential signals simultaneously available; and first matrixing means combining equal portions of said simultaneously available line sequential signals to derive said luminance.
Claim 22
Independent Claim
117 words
A system for encoding and decoding color television signals in the form of color difference components primarily representative of the chromaticity of a scene, and a luminance component representative of the brightness of the scene, said system comprising: means for cyclically combining said color difference components with said luminance component to form line sequentially encoded signals, which when algebraically added in eQual proportions yields said luminance component; signal translation means; means for applying said line sequentially encoded signals to said signal translation means; signal delaying means coupled to said translation means for rendering said line sequential signals simultaneously available; and first matrixing means combining equal portions of said simultaneously available line sequential signals to derive said luminance.
Claim 23
Dependent Claim
43 words
A system as described in claim 19, which further comprises second matrixing means for combining said color difference components to develop a chrominance component, and third matrixing means combining said chrominance component with said luminance component to develop a composite color television signal.
Claim 24
Dependent Claim
65 words
A system as described in claim 20 further including means for generating a carrier signal; a modulator for impressing said line sequential signals on said carrier; said signal delaying means comprising a pair of serially connected delay lines for delaying the resulting modulated signals; and said first matrixing means including a detector for deriving said luminance component from said line sequential signal modulated carrier signals.
Claim 25
Dependent Claim
25 words
The system of claim 20 wherein the frequency band of said luminance component is substantially larger than the frequency band of said color difference components.
Claim 26
Dependent Claim
51 words
The system as described in claim 22 wherein said luminance component derived by said first matrixing means comprises only frequencies below a predetermined cut-off frequency; and high pass filter means coupled to said translation means for coupling only the luminance component frequencies above said cut-off frequency to said third matrix means.
References Cited (Backward Citations)
US3522371A
Cited
US3749835A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-26 | 1978-02-25 | 1978-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-26 | 1982-02-25 | 1982-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-26 | 1986-02-25 | 1986-08-27 | $7700.00 | Window Closed / Lapsed |