US4262302A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Video display processor having an integral composite video generator
Assignee: Texas Instruments Inc
•
Filing: 1979-03-05
•
Granted: 1981-04-14
•
Expires: 1999-03-05
Abstract
Abstract A digital computing system is disclosed having a monolithic microprocessor, a versatile input/output subsystem, a multi-medium capability. In the memory subsystem, a balanced mix of dynamic RAM, P-channel MOS ROM and N-channel MOS ROM are included to minimize cost without sacrificing performance. In the video display subsystem, a monolithic video display processor performs all RAM access functions, in addition to composite video generation. The resultant composite video signal, which may include audio and external video information, can be applied directly to a video monitor or RF modulated for use by a television receiver.
Inventors
- 👤 Joe F. Sexton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:03
CPC Classifications
G; G09; G09G; G09G1/00; G09G1/28; G09G1/285; G09G5/00; G09G5/42
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
166 words
A video display system comprising: (a) a raster-scanned video display unit; (b) sequence control means for providing a color reference signal having a predetermind frequency; and, (c) video generator means for providing a video signal for application to said video display unit, the video generator means comprising: (i) color generator means, responsive to the color reference signal, for generating first and second color phase signals of predetermined phase and frequency relative to the color reference signal; (ii) voltage divider means for providing first and second reference voltages having a potential difference proportional to a predetermined chrominance value and an average potential proportional to a pre-determined luminance value; (iii) gating means, responsive to the color phase signals, for selectively gating said first reference voltage in phase with said first color phase signal, and said second reference voltage in phase with said second color phase signal; and (iv) mixer means, responsive to the gated reference voltages, for providing said video signal at the predetermined chrominance and luminance values.
Claim 2
Dependent Claim
166 words
A video display system comprising: (a) a raster-scanned video display unit; (b) sequence control means for providing a color reference signal having a predetermind frequency; and, (c) video generator means for providing a video signal for application to said video display unit, the video generator means comprising: (i) color generator means, responsive to the color reference signal, for generating first and second color phase signals of predetermined phase and frequency relative to the color reference signal; (ii) voltage divider means for providing first and second reference voltages having a potential difference proportional to a predetermined chrominance value and an average potential proportional to a pre-determined luminance value; (iii) gating means, responsive to the color phase signals, for selectively gating said first reference voltage in phase with said first color phase signal, and said second reference voltage in phase with said second color phase signal; and (iv) mixer means, responsive to the gated reference voltages, for providing said video signal at the predetermined chrominance and luminance values.
Claim 3
Dependent Claim
40 words
The video display system of claim 1 wherein the first and second reference voltages are selected to have a potential difference proportional to the chrominance of a predetermined color and an average value proportional to the luminance of said color.
Claim 4
Dependent Claim
50 words
The video display system of claim 1 wherein the voltage divider means provides a third reference voltage having a potential proportional to a predetermined luminance value, and wherein the gating means selectively gates said third reference voltage, whereby the mixer means provides said video signal at the predetermined luminance value.
Claim 5
Dependent Claim
34 words
The video display system of claim 3 wherein the third reference voltage is selected to have a potential proportional to the luminance value of a predetermined one of the colors white, gray and black.
Claim 6
Dependent Claim
28 words
The video display system of claim 3 wherein the third reference voltage has a potential proportional to the luminance value of one of the blanking and sync levels.
Claim 7
Dependent Claim
41 words
The video display system of claims 1 or 5 wherein the first and second reference voltages are selected to have a potential difference proportional to the peak-to-peak value of the color burst and an average potential proportional to the blanking level.
Claim 8
Dependent Claim
33 words
The video display processor of claim 6 wherein the gating means selectively gates an external video signal, whereby the mixer means provides said video signal at the level of said external video signal.
Claim 9
Dependent Claim
42 words
The video display processor of claim 7 wherein the sequence control means provides a composite sync signal of predetermined form and duration relative to the color reference signal, and wherein the gating means selectively gates in response to said composite sync signal.
Claim 10
Dependent Claim
38 words
The video display system of claims 2 or 4 further comprising: selector means for providing a color select signal indicative of said predetermined color; and, wherein the gating means selectively gates in response to said color select signal.
Claim 11
Dependent Claim
60 words
The video display system of claim 9 wherein the selector means provide a color select signal indicative of a transparent state and wherein the gating means selectively gates an external video signal in response to the color select signal indicative of said transparent state, whereby the mixer means provides said video signal at the level of said external video signal.
Claim 12
Dependent Claim
33 words
The video display system of claim 1 wherein the gating means selectively gates an external video signal, whereby the mixer means provides said video signal at the level of said external video signal.
Claim 13
Dependent Claim
42 words
The video display system of claim 11 wherein the sequence control means provide a composite sync signal of predetermined form and duration relative to the color reference signal, and wherein the gating means selectively gates in response to said composite sync signal.
Claim 14
Dependent Claim
153 words
A video display processor comprising: (a) sequence control means for providing a color reference signal having a predetermined frequency; and, (b) video generator means for providing a video signal, said video generator means comprising: (i) color phase generator means, responsive to the color reference signal, for generating first and second color phase signals of predetermined phase and frequency relative to the color reference signal; (ii) voltage divider means for providing first and second reference voltages having a potential difference proportional to a predetermined chrominance value and an average potential proportional to a predetermined luminance value; (iii) gating means, responsive to the color phase signals, for selectively gating said first reference voltage in phase with said first color phase signal, and said second reference voltage in phase with said second color phase signal; (iv) mixer means, responsive to the gated reference voltages, for providing said video signal at the predetermined chrominance and luminance values.
Claim 15
Dependent Claim
153 words
A video display processor comprising: (a) sequence control means for providing a color reference signal having a predetermined frequency; and, (b) video generator means for providing a video signal, said video generator means comprising: (i) color phase generator means, responsive to the color reference signal, for generating first and second color phase signals of predetermined phase and frequency relative to the color reference signal; (ii) voltage divider means for providing first and second reference voltages having a potential difference proportional to a predetermined chrominance value and an average potential proportional to a predetermined luminance value; (iii) gating means, responsive to the color phase signals, for selectively gating said first reference voltage in phase with said first color phase signal, and said second reference voltage in phase with said second color phase signal; (iv) mixer means, responsive to the gated reference voltages, for providing said video signal at the predetermined chrominance and luminance values.
Claim 16
Dependent Claim
40 words
The video display processor of claim 13 wherein the first and second reference voltages are selected to have a potential difference proportional to the chrominance of a predetermind color and an average value proportional to the luminance of said color.
Claim 17
Dependent Claim
50 words
The video display processor of claim 13 wherein the voltage divider means provides a third reference voltage having a potential proportional to a predetermined luminance value, and wherein the gating means selectively gates said third reference voltage, whereby the mixer means provides said video signal at the predetermined luminance value.
Claim 18
Dependent Claim
34 words
The video display processor of claim 15 wherein the third reference voltage is selected to have a potential proportional to the luminance value of a predetermined one of the colors white, gray and black.
Claim 19
Dependent Claim
28 words
The video display processor of claim 15 wherein the third reference voltage has a potential proportional to the luminance value of one of the blanking and sync levels.
Claim 20
Dependent Claim
41 words
The video display processor of claims 13 and 17 wherein the first and second reference voltages are selected to have a potential difference proportional to the peak-to-peak value of the color burst and an average potential proportional to the blanking level.
Claim 21
Dependent Claim
33 words
The video display processor of claim 18 wherein the gating means selectively gates an external video signal, whereby the mixer means provides said video signal at the level of said external video signal.
Claim 22
Dependent Claim
41 words
The video display processor claim 19 wherein the sequence control means provides a composite sync signal of predetermined form and duration relative to the color reference signal, and wherein the gating means selectively gates in response to said composite sync signal.
Claim 23
Dependent Claim
38 words
The video display processor of claims 14 or 16 further comprising: selector means for providing a color select signal indicative of said predetermined color; and, wherein the gating means selectively gates in response to said color select signal.
Claim 24
Dependent Claim
60 words
The video display processor of claim 22 wherein the selector means provides a color select signal indicative of a transparent state and wherein the gating means selectively gates an external video signal in response to the color select signal indicative of said transparent state, whereby the mixer means provides said video signal at the level of said external video signal.
Claim 25
Dependent Claim
33 words
The video display processor of claim 13 wherein the gating means selectively gates an external video signal, whereby the mixer means provides said video signal at the level of said external video signal.
Claim 26
Dependent Claim
42 words
The video display processor of claim 23 wherein the sequence control means provides a composite sync signal of predetermined form and duration relative to the color reference signal, and wherein the gating means selectively gates in response to said composite snyc signal.
References Cited (Backward Citations)
US3761607A
Cited
US3749823A
Cited
US4081797A
Cited
US3891792A
Cited
US3918039A
Cited
US4093960A
Cited
US4034990A
Cited
US4129858A
Cited
US4107664A
Cited
US4116444A
Cited
US4155095A
Cited
US4119955A
Cited
US4139838A
Cited
US4107665A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-04-13 | 1984-10-13 | 1985-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-13 | 1988-10-13 | 1989-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-13 | 1992-10-13 | 1993-04-14 | $7700.00 | Window Closed / Lapsed |