US 4,542,402 AGranted

Digital color matrix for a digital television receiver

AssigneeRCA Corporation

InventorJoseph R. Ader

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Abstract

In a digital television receiver, a digital signal processing system generates samples of binary coded color mixture digital signals that are a representation of color picture information. The values of binary coded coefficients that convert the representation of the color picture information into binary coded color difference signals are stored in a memory accessed by a microprocessor. In response to adjustment of controls such as contrast and tint, the microprocessor modifies the coefficients. The modified coefficients are placed in a digital store such as a latch arrangement. A multiplier arrangement receives samples of the color mixture digital signals as first inputs for multiplying them by corresponding modified coefficients that are supplied by the digital store as second inputs. A clock signal is generated that sequentially clocks out of the digital store selected ones of the modified coefficients for developing a sequence of products corresponding to the color mixture components of the color difference signal. The products are then combined to form samples of the binary coded color difference signal.

Claims8

Dependent claims

A digital color matrix for a digital television receiver, comprising:

means for generating samples of binary coded color mixture digital signals that are a representation of color picture information;
means for generating values of binary coded coefficients that convert the representation of said color picture information from color mixture signals into binary coded color difference signals;
means for storing said binary coded coefficients;
a multiplier arrangement receiving samples of said binary coded color mixture digital signals as first inputs for multiplying samples thereof by corresponding binary coded coefficients that are supplied by said storing means as second inputs, wherein the multiplication process is capable of being performed in a pipeline operation such that a next subsequent multiplication is started before a given multiplication is completed;
means for sequentially clocking out of said storing means selected ones of said binary coded coefficients at short enough intervals to permit pipelining of the multiplication process for developing a plurality of products corresponding to the color mixture components of said binary coded color difference signals;
and
means responsive to said plurality of products for combining the products to form samples of said binary coded color difference signals.

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Dependencies are inferred from the claim text.