Patent US4345769A successfully refreshed from Google Patents.
Patent US3764826A successfully refreshed from Google Patents.
US3764826A
Expired / Lapsed
US
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Transistor circuit for color television receiver
Assignee: Sony Corp
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Filing: 1971-08-19
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Granted: 1973-10-09
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Expires: 1991-08-19
Abstract
Abstract A transistor matrix circuit for a color television receiver which receives a luminance signal, and color difference signals, and provides color signals. The circuit is of a novel design using only transistors of one type thereby permitting the manufacture of the circuit in integrated circuit form. The circuit also includes adjustable circuit elements for independent control of the levels of each color signal and in which only the saturation degrees of the color signals are adjusted without changing their hues.
Inventors
- 👤 T Okada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:18
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/64; H04N9/67
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
255 words
A color television receiver transistor matrix circuit adapted to receive luminance and color difference input signals having a predetermined bias potential and to provide a color input signal, said matrix circuit comprising: first and second transistors of like type each having first, second and third terminals; means for connecting said first terminals of said first and second transistors to a power source; an impedance element connected between said second termInals of said first and second transistors; current source means connected between one end of said impedance element nearest said second transistor and a reference potential different from the potential of said power source for carrying currents flowing in said impedance element and second transistor, respectively; means connected to said third terminal of the second transistor for fixedly biasing said second transistor; means for applying one of said input signals to said third terminal of the first transistor so that the latter is biased by said predetermined bias potential of said one input signal; a third transistor of the same type as said first and second transistors and having first, second and third terminals, said first terminal of said third transistor being connected to the other end of said impedance element, said second terminal of said third transistor being connected to a reference potential, and said third terminal of said third transistor being adapted to receive the other of said input signals; and an output terminal for the color signal generated in said circuit and being connected to said first terminal of one of said transistors.
Claim 2
Dependent Claim
255 words
A color television receiver transistor matrix circuit adapted to receive luminance and color difference input signals having a predetermined bias potential and to provide a color input signal, said matrix circuit comprising: first and second transistors of like type each having first, second and third terminals; means for connecting said first terminals of said first and second transistors to a power source; an impedance element connected between said second termInals of said first and second transistors; current source means connected between one end of said impedance element nearest said second transistor and a reference potential different from the potential of said power source for carrying currents flowing in said impedance element and second transistor, respectively; means connected to said third terminal of the second transistor for fixedly biasing said second transistor; means for applying one of said input signals to said third terminal of the first transistor so that the latter is biased by said predetermined bias potential of said one input signal; a third transistor of the same type as said first and second transistors and having first, second and third terminals, said first terminal of said third transistor being connected to the other end of said impedance element, said second terminal of said third transistor being connected to a reference potential, and said third terminal of said third transistor being adapted to receive the other of said input signals; and an output terminal for the color signal generated in said circuit and being connected to said first terminal of one of said transistors.
Claim 3
Dependent Claim
31 words
A transistor matrix circuit according to claim 1 wherein a further impedance element is connected between the second terminal of said first transistor and said other end of said impedance element.
Claim 4
Dependent Claim
29 words
A transistor matrix circuit according to claim 2 wherein said further impedance element is variable and adapted to be manually adjusted to control the amplitude of the color signal.
Claim 5
Dependent Claim
23 words
A transistor matrix circuit according to claim 1 wherein said output color signal is provided at the first terminal of the first transistor.
Claim 6
Dependent Claim
37 words
A transistor matrix circuit according to claim 1 wherein the means for biasing said second transistor biases the latter to the same extent as said predetermined bias potential of said one input signal biases said first transistor.
Claim 7
Dependent Claim
59 words
A transistor matrix circuit according to claim 1 wherein said current source means is adapted to carry currents whose amplitude is larger than the maximum current which passes through said impedance element as a result of said one input signal being applied to the third terminal of said first transistor, whereby cutting off of said second transistor is avoided.
Claim 8
Dependent Claim
26 words
A transistor matrix circuit according to claim 1, wherein said first, second and third terminals are respectively the collector, emitter, and base of the respective transistor.
Claim 9
Dependent Claim
37 words
A transistor matrix circuit according to claim 3, wherein a fourth transistor of the same type as said first, second and third transistors, is interconnected to said second transistor and said bias means in a Darlington configuration.
Claim 10
Dependent Claim
234 words
A color television receiver transistor matrix circuit adapted to receive two kinds of input signals respectively consisting of a luminance input signal and three different color difference input signals, and to provide three color output signals, said matrix circuit comprising: first, second and third transistors of like type, each having first, second and third terminals; means for connecting said first terminals of said transistors to a power source; first, second and third impedance elements respectively connected, at one end, to said second terminals of said first, second and third transistors; means connected to the other ends of said impedance elements for carrying currents passing through the latter and for maintaining a substantially constant potential at said other ends of the impedance elements; means for applying one of said kinds of input signals to said third terminals of said first, second and third transistors, respectively; and fourth, fifth and sixth transistors of the same type as said first, second and third transistors and each having first, second and third terminals, said first terminals of said fourth, fifth and sixth transistors being connected to said one end of said first, second and third impedaNce elements, respectively, said second terminals of said fourth, fifth and sixth transistors being connected to a reference potential, and said third terminals of said fourth, fifth and sixth transistors being adapted to receive the other of said two kinds of input signals.
Claim 11
Dependent Claim
234 words
A color television receiver transistor matrix circuit adapted to receive two kinds of input signals respectively consisting of a luminance input signal and three different color difference input signals, and to provide three color output signals, said matrix circuit comprising: first, second and third transistors of like type, each having first, second and third terminals; means for connecting said first terminals of said transistors to a power source; first, second and third impedance elements respectively connected, at one end, to said second terminals of said first, second and third transistors; means connected to the other ends of said impedance elements for carrying currents passing through the latter and for maintaining a substantially constant potential at said other ends of the impedance elements; means for applying one of said kinds of input signals to said third terminals of said first, second and third transistors, respectively; and fourth, fifth and sixth transistors of the same type as said first, second and third transistors and each having first, second and third terminals, said first terminals of said fourth, fifth and sixth transistors being connected to said one end of said first, second and third impedaNce elements, respectively, said second terminals of said fourth, fifth and sixth transistors being connected to a reference potential, and said third terminals of said fourth, fifth and sixth transistors being adapted to receive the other of said two kinds of input signals.
Claim 12
Dependent Claim
48 words
A transistor matrix circuit according to claim 9 wherein three further impedance elements are connected one each between the second terminal of a respective one of said first, second and third transistors and said one end of the respective one of said first, second and third impedance elements.
Claim 13
Dependent Claim
32 words
A transistor matrix circuit according to claim 10 wherein each of said further impedance elements is variable and adapted to be manually adjusted to control the amplitude of the respective color signal.
Claim 14
Dependent Claim
78 words
A transistor matrix circuit according to claim 9 wherein said means connected to the other end of each of said impedance elements includes a seventh transistor having three terminals; one terminal of said seventh transistor being connected to said power source; a constant current source connected to the second terminal of said seventh transistor and to said other end of each of said impedance elements; and fixed bias means connected to the third terminal of said seventh transistor.
Claim 15
Dependent Claim
27 words
A transistor matrix circuit according to claim 12 wherein a further transistor is interconnected with said seventh transistor and said fixed bias means in a Darlington configuration.
Claim 16
Dependent Claim
121 words
A transistor matrix circuit according to claim 9 wherein said means connected to the other ends of said impedance elements includes seventh, eighth and ninth transistors of the same type as said first, second and third transistors and each having first, second and third terminals, the first terminal of each of said seventh, eighth and ninth transistors being connected to said power source, said second terminal of each of said seventh, eighth, and ninth transistors being connected to said other ends of said first, second and third impedance elements, respectively, current source means connected to said second terminals of said seventh, eighth and ninth transistors, and fixed bias means connected to said third terminals of said seventh, eighth and ninth transistors.
References Cited (Backward Citations)
US3586766A
Cited
US3619486A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |