Color separator for digital television
AssigneeTexas Instruments Incorporated
InventorRobert J. Gove
Life of this patent
Estimating the term…
Abstract
A color separator (12) for a digital television receiver (10). The incoming television signal is directed to two different paths in the color separator (12). Along a first path, the luminance component is separated by an analog Y separator (12a) and then sampled by an A/D converter (12b) at a rate that will provide a desired number of samples per display line. Along a second path, the composite signal is sampled by an A/D converter (12c) at a rate appropriate for digital color separation, and then the chrominance samples are separated using a digital C separator (12d). A scaling unit (12e) then scales the chrominance samples to provide a desired number of samples per line.
Claims15
A digital color separator for a video signal receiver, comprising:
- an analog luminance separation unit for receiving a video input signal and for separating said signal's luminance component from said signal's chrominance components;
- a first analog-to-digital converter for sampling said luminance component at a rate determined by the number of pixels per line to be displayed;
- a second analog-to-digital converter for receiving said input signal and for sampling said input signal at a rate appropriate for digital color separation;
- a digital chrominance separation unit for receiving data samples from said second analog-to-digital converter and for separating samples of said luminance component from samples of said chrominance components;
- and
- a scaling unit for scaling said chrominance samples so that the number of chrominance samples per line is substantially the same as said number of pixels per line to be displayed.
A method of separating luminance from chrominance components of a television input signal, comprising the steps of:
- using an analog luminance separation unit to separate the luminance component of said input signal thereby providing a luminance signal;
- sampling said luminance signal at a rate determined by a desired number of pixels per line to be displayed;
- sampling said input signal at a rate appropriate for digital color separation thereby providing combined luminance/chrominance data samples;
- using a digital chrominance separation unit to separate chrominance samples from luminance samples of said combined luminance/chrominance data samples;
- and
- scaling said chrominance samples such that the number of said chrominance samples per line is substantially the same as said desired number of pixels per line to be displayed.
A digital signal receiver, comprising:
- a color separator having
- an analog luminance separation unit for receiving an input signal and for separating said signal's luminance component from said signal's chrominance components,
- a first analog-to-digital converter for sampling said luminance component at a rate determined by the number of pixels per line to be displayed,
- a second analog-to-digital converter for receiving said input signal and for sampling said input signal at a rate appropriate for digital color separation,
- a digital chrominance separation unit for receiving data samples from said second analog to digital converter and for separating samples of said luminance component from samples of said chrominance components, and
- a scaling unit for scaling said chrominance samples so that the number of chrominance samples per line is the same as said number of pixels per line to be displayed;
- a processor for receiving luminance data from said first analog-to-digital converter and chrominance data from said scaling unit and for performing pixel processing tasks on said chrominance and luminance data;
- and
- a memory for storing said pixel data during processing and for providing said pixel data to a display.
Dependencies are inferred from the claim text.