Method and apparatus for digital control of a separately coded color television signal
AssigneeRobert Bosch GmbH
InventorHerbert Robitzsch
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Abstract
Undesired color discontinuities in the display of color television signals which were processed digitally and which have separately coded luminance and chrominance signals are eliminated by controlling the luminance signals with a broadband control signal and the chrominance signals with a narrowband control signal. For this purpose, the available broadband control signal is filtered to create the narrowband signal and a multiplexer is provided to apply either the filter output or the broadband signal to a multiplier whose second set of inputs receives luminance and chrominance signals in a predetermined order in each cycle.
Claims7
Method for digital control of a digital color television signal having individually coded luminance and chrominance signals, comprising the steps of:
- generating a first and second control signal, wherein
- said first control signal has a first predetermined bandwidth and said second control signal has a second predetermined bandwidth narrower than said first predetermined bandwidth;
- and controlling the amplitude of said luminance and chrominance signals with said first and second control signals, respectively.
Apparatus for digital control of the individually coded digital luminance and chrominance signals together constituting a digital color television signal, comprising
- means (7, 8, 9) for generating first and second control signals;
- and
- means (3) for applying said first control signals to at least selected ones of said luminance signals and said second control signals to said chrominance signals;
- wherein said means for generating first and second control signals comprises
- means for receiving a broadband control signal,
- means (9) connected to said receiving means for filtering said broadband control signal, thereby creating a narrow-band control signal,
- and multiplexer means connected to said filter means,
- said receiving means, and said applying means for selectively furnishing
- (a) said broadband control signals or
- (b) said narrow-band control signals to said applying means under control of synchronization signals for controlling the amplitude of the respective luminance and chrominance signals.
Dependencies are inferred from the claim text.