Patent US3564122A successfully refreshed from Google Patents.
US3564122A
Expired / Lapsed
US
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Video signal separation means
Assignee: BAE Systems Space & Mission Systems Inc
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Filing: 1967-11-13
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Granted: 1971-02-16
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Expires: 1987-11-13
Abstract
Abstract Apparatus for use in color television including a filter network for separation of color and monochrome signal components of a color television video signal, a resistive matrix for summing the monochrome and color components of the television signal and a path for feeding back the summation signal to the input of the circuit after recombining the separate components so as to minimize deterioration of signal quality due to imprecise frequency selection in the filter network.
Inventors
- 👤 Richard S Wise
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:29
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/77; H04N9/78
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
162 words
A signal separation circuit, comprising: input means adapted to receive an alternating current video signal having a spectrum of frequencies included therein; first video frequency selection means connected with said input means to receive said alternating current video signal therefrom and reject a predetermined portion of said spectrum of frequencies in said received alternating current video signal and passing at least a portion of the remainder of said spectrum of frequencies in said received alternating current video signal; second video frequency selection means connected with said input means to receive said alternating current video signal therefrom and pass substantially only said predetermined portion of said spectrum of frequencies in said received alternating current video signal; summing means connected to receive the alternating current video signal outputs from said first and second frequency selection means; and feedback means connected between said summing means and said input means to minimize deterioration of signal quality due to imprecise frequency selection by said frequency selection means.
Claim 2
Dependent Claim
162 words
A signal separation circuit, comprising: input means adapted to receive an alternating current video signal having a spectrum of frequencies included therein; first video frequency selection means connected with said input means to receive said alternating current video signal therefrom and reject a predetermined portion of said spectrum of frequencies in said received alternating current video signal and passing at least a portion of the remainder of said spectrum of frequencies in said received alternating current video signal; second video frequency selection means connected with said input means to receive said alternating current video signal therefrom and pass substantially only said predetermined portion of said spectrum of frequencies in said received alternating current video signal; summing means connected to receive the alternating current video signal outputs from said first and second frequency selection means; and feedback means connected between said summing means and said input means to minimize deterioration of signal quality due to imprecise frequency selection by said frequency selection means.
Claim 3
Dependent Claim
56 words
The circuit defined by claim 1 wherein said summing means includes a pair of transistors connected in parallel emitter-follower configuration, the bases of the pair of transistors being connected to the first and second frequency selection means, respectively, and a resistive matrix connected between said emitters of said transistors for summing the signals from said transistors.
Claim 4
Independent Claim
163 words
A system for separating a signal into separate frequency components, the system comprising: an input for receiving the signal; means connected to the input for amplifying the signal; a first filter connected to the amplifying means and tuned to reject substantially all of one of the frequency components of the amplified signal and to pass at least a portion of other components thereof; a second filter tuned substantially complementary to said first filter and connected to the amplifying means for passing substantially all of the one frequency component; a resistive matrix for summing the passed frequency components from the first and second frequency components; means connected to said first and second filters for impedance matching said filters and said resistive matrix; and feedback means connected to the resistive matrix and to the amplifying means whereby a portion of the summation signal from the summing means may be fed back and compared with the input signal to compensate for tuning imperfections in said filters.
Claim 5
Independent Claim
163 words
A system for separating a signal into separate frequency components, the system comprising: an input for receiving the signal; means connected to the input for amplifying the signal; a first filter connected to the amplifying means and tuned to reject substantially all of one of the frequency components of the amplified signal and to pass at least a portion of other components thereof; a second filter tuned substantially complementary to said first filter and connected to the amplifying means for passing substantially all of the one frequency component; a resistive matrix for summing the passed frequency components from the first and second frequency components; means connected to said first and second filters for impedance matching said filters and said resistive matrix; and feedback means connected to the resistive matrix and to the amplifying means whereby a portion of the summation signal from the summing means may be fed back and compared with the input signal to compensate for tuning imperfections in said filters.
Claim 6
Dependent Claim
98 words
The system as defined by claim 3 wherein the amplifying means includes: a first transistor amplifier having the base connected to receive the input signal and the emitter connected to the feedback means; means connected to said base for varying the bias on said first transistor to control the conductivity threshold thereof; a second transistor amplifier having the base connected to the output of said first transistor, and a third transistor amplifier having a control element connected to an output of said second transistor, said third transistor being connected in emitter-follower configuration to said first and second filters.
Claim 7
Dependent Claim
64 words
The system as defined in claim 3 wherein the impedance matching means includes: a pair of transistors connected in emitter-follower configuration, the emitter-collector paths of said transistors connected in parallel with each other and the bases being connected to receive the passed frequency components from said first and second filters, respectively, said resistive matrix being connected between the emitters of the pair of transistors.
Claim 8
Independent Claim
212 words
A system for separating a color video signal into separate frequency components, the system comprising: an input for receiving the color video signal; means connected to the input for amplifying the color video signAl; a first resistor connected to the amplifying means; a first parallel resonant circuit resonant at a frequency of one component and having first and second terminals, said first terminal being connected to the first resistor; a second parallel resonant circuit resonant substantially at the frequency of the one component and having first and second terminals, said first terminal being connected to the amplifying means; a second resistor connected at one end to the second terminal of the second resonant circuit and connected at another end to the second terminal of the first resonant circuit; means connected to the first terminal of the first resonant circuit and to the second terminal of the second resonant circuit for summing the separated frequency components; and means for feeding back the summation signal to the amplifying means for comparison with the color video input signal whereby the first parallel resonant circuit permits the one signal component to pass from the first resistor to the summing means and the second parallel resonant circuit prohibits passing of the one component to the summing means.
Claim 9
Independent Claim
212 words
A system for separating a color video signal into separate frequency components, the system comprising: an input for receiving the color video signal; means connected to the input for amplifying the color video signAl; a first resistor connected to the amplifying means; a first parallel resonant circuit resonant at a frequency of one component and having first and second terminals, said first terminal being connected to the first resistor; a second parallel resonant circuit resonant substantially at the frequency of the one component and having first and second terminals, said first terminal being connected to the amplifying means; a second resistor connected at one end to the second terminal of the second resonant circuit and connected at another end to the second terminal of the first resonant circuit; means connected to the first terminal of the first resonant circuit and to the second terminal of the second resonant circuit for summing the separated frequency components; and means for feeding back the summation signal to the amplifying means for comparison with the color video input signal whereby the first parallel resonant circuit permits the one signal component to pass from the first resistor to the summing means and the second parallel resonant circuit prohibits passing of the one component to the summing means.
Claim 10
Dependent Claim
97 words
The system as defined by claim 6 wherein the amplifying means includes: a first transistor of one conductivity type having a control element connected to the input for receiving the color video signal; a second transistor of another conductivity type having a control element connected to an output of the first transistor; and a third transistor of the one conductivity type having a control element connected to an output of the second transistor, said third transistor being connected in emitter-follower configuration to the first resistor and connected to the first terminal of the second parallel resonant circuit.
Claim 11
Dependent Claim
161 words
The system as defined in claim 7 wherein the summation means includes: a third resistor connected to the first terminal of the first resonant circuit; a fourth resistor connected to the second terminal of the second resonant circuit; a fourth transistor of the one conductivity type having a control element connected to an opposite end of the third resistor and a collector-emitter path in parallel with the collector-emitter path of the third transistor; a fifth transistor of the one conductivity type having a control element connected to an opposite end of the fourth resistor and a collector-emitter path in parallel with the collector-emitter path of said third and fourth transistors, said fourth and fifth transistors being connected in emitter-follower configuration; a fifth resistor connected to the output of said fourth transistor; and a sixth resistor connected at one end to the output of the fifth transistor and having an opposite end connected to said fifth resistor and to said feedback means.
Claim 12
Dependent Claim
48 words
The system as defined by claim 8 wherein the feedback means includes a seventh resistor connected intermediate the fifth and sixth resistors and an emitter of the first transistor, said seventh resistor being effective to control the proportion of the summation signal fed back to the amplifying means.
Claim 13
Independent Claim
230 words
A system for separating a color video signal into chrominance and monochrome frequency components, the system comprising: means for amplifying the color video signal; a first resistor connected to the amplifying means; a capacitor; an inductor connected in parallel with the capacitor and defining a first resonant circuit tuned to the frequency of the chrominance component of the color video signal and having first and second terminals, said first terminal being connected to the first resistor; another capacitor; another inductor in parallel with the other capacitor and defining a second resonant circuit tuned to the frequency of the chrominance component of the color video signal and having first and second terminals, said first terminal being connected to the amplifying means; a second resistor connected between the second termiNal of the second resonant circuit and the second terminal of the first resonant circuit; means connected to the first terminal of the first resonant circuit and to the second terminal of the second resonant circuit for summing the separated frequency components; means for feeding back the summation signal to the amplifying means for comparison with the color input video signal; and whereby the first parallel resonant circuit permits the chrominance component to pass from the first resistor to the summing means and the second parallel resonant circuit prohibits passing of the chrominance component to the summing means and passes the monochrome component.
Claim 14
Independent Claim
230 words
A system for separating a color video signal into chrominance and monochrome frequency components, the system comprising: means for amplifying the color video signal; a first resistor connected to the amplifying means; a capacitor; an inductor connected in parallel with the capacitor and defining a first resonant circuit tuned to the frequency of the chrominance component of the color video signal and having first and second terminals, said first terminal being connected to the first resistor; another capacitor; another inductor in parallel with the other capacitor and defining a second resonant circuit tuned to the frequency of the chrominance component of the color video signal and having first and second terminals, said first terminal being connected to the amplifying means; a second resistor connected between the second termiNal of the second resonant circuit and the second terminal of the first resonant circuit; means connected to the first terminal of the first resonant circuit and to the second terminal of the second resonant circuit for summing the separated frequency components; means for feeding back the summation signal to the amplifying means for comparison with the color input video signal; and whereby the first parallel resonant circuit permits the chrominance component to pass from the first resistor to the summing means and the second parallel resonant circuit prohibits passing of the chrominance component to the summing means and passes the monochrome component.
Claim 15
Dependent Claim
112 words
The system defined in claim 10 wherein the summing means includes: a transistor having a base connected to receive the passed chrominance component; another transistor having a base connected to receive the passed monochrome component; the first mentioned transistor having a collector-emitter path in parallel with the collector-emitter path of the other transistor; a resistive matrix connected between the emitters of the transistors for effecting a summation signal of the chrominance and monochrome signals from the emitters of the respective transistors; and wherein the feedback means includes a resistor connected intermediate the resistive matrix and the amplifying means for controlling the proportion of the summation signal fed back to the amplifying means.
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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |