EP0240971A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Apparatus for providing an indication of color television signal validity
Assignee: Tektronix Inc
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Filing: 1987-04-06
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Granted: —
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Expires: 2007-04-06
Abstract
Abstract Apparatus for providing a signal that indicates whether the color represented by a luminance and color difference component video signal is validly reproducible using a color display device, comprises a matrix connected to receive the luminance and color difference components and provide primary color components therefrom, and a comparator for comparing the amplitude of each primary color component with predetermined minimum and maximum levels and providing an indication if the amplitude of one or more of the primary color components is outside the range established by the predetermined maximum and minimum values therefor.
Inventors
- 👤 Bruce J. Penney
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 16:23
CPC Classifications
H; H04; H04N; H04N17/00; H04N17/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
93 words
Apparatus for providing a signal that indicates whether the color represented by a luminance and color difference component video signal is validly reproducible using a color display device, comprising first means connected to receive the luminance and color difference components and provide primary color components therefrom, and comparison means for comparing the amplitude of each primary color component with predetermined minimum and maximum levels and providing an indication if the amplitude of one or more of the primary color components is outside the range established by the predetermined maximum and minimum values therefor.
Claim 2
Dependent Claim
93 words
Apparatus for providing a signal that indicates whether the color represented by a luminance and color difference component video signal is validly reproducible using a color display device, comprising first means connected to receive the luminance and color difference components and provide primary color components therefrom, and comparison means for comparing the amplitude of each primary color component with predetermined minimum and maximum levels and providing an indication if the amplitude of one or more of the primary color components is outside the range established by the predetermined maximum and minimum values therefor.
Claim 3
Dependent Claim
13 words
Apparatus according to claim 1, wherein the first mean comprise a resistive matrix.
Claim 4
Dependent Claim
91 words
Apparatus according to claim 1, wherein the comparison means comprise three pairs of comparators for receiving the three primary color components respectively, each pair of comparators consisting of a first comparator that provides a logical 1 output if but only if the amplitude of the associated primary color component is greater than the predetermined maximum value for that component and a second comparator that provides a logical 1 output if but only if the amplitude of the associated primary color component is less than the predetermined minimum value for that component.
Claim 5
Dependent Claim
43 words
Apparatus according to claim 3, comprising an OR-gate connected to receive the outputs of the comparators and provide a gamut error signal having a level representing logical 1 if but only if the output of any of the comparators is a logical 1.
Claim 6
Dependent Claim
42 words
Apparatus according to claim 4, comprising display modifier means connected to receive the gamut error signal, the display modifier means being effective to cause a visually distinct indication to be provided when the gamut error signal has a value representing logical 1.
Claim 7
Dependent Claim
60 words
Apparatus according to claim 5, wherein the display modifier means are connected in the path of the video signal and are operative to modify the video signal in the event that the gamut error signal has a value representing logical 1, whereby a visually distinct indication is provided when the modified video signal is employed to drive a display device.
References Cited (Backward Citations)
No citation records indexed.
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