Logarithmic color matrix for a digital television receiver

DETAILED DESCRIPTION What is claimed is: 1.
A logarithmic color matrix for a digital television receiver, comprising: first means for generating first color mixture digital signals representing color picture information as components in a first color mixture coordinate system; second means responsive to said first color mixture digital signals for converting said first color mixture digital signals into logarithmic form; third means for generating digital coefficients in logarithmic form that enable said first color mixture digital signals to be transformed into second color mixture digital signals representing said color picture information as components in a second color mixture coordinate system; an adder for summing the first color mixture digital signals in logarithmic form with the digital coefficients in logarithmic form to obtain at an output thereof digital signals in logarithmic form that represent a plurality of products corresponding to the first color mixture constituents of said second color mixture digital signals; fourth means responsive to the output of said adder for converting by means of inverse logarithmic operation said plurality of products into said first color mixture constituents; and fifth means for combining said first color mixture constituents to obtain said second color mixture digital signals.
2.
A logarithmic color matrix according to claim 1 wherein said first means produces, in logarithmic form a sequence of in-phase related and quadrature-phase related components having associated therewith differently valued digital coefficients obtained from said coefficient generating means and including a digital store for storing said differently valued coefficients and a multiplexer coupled to said digital store and to said adder for supplying thereto a sequence of coefficients in the order corresponding to the sequence of in-phase related and quadrature-phase related components.
3.
A logarithmic color matrix according to claim 2 wherein said fourth means converts said plurality of products into a sequence of first color mixture constituents having intermixed the in-phase related and the quadrature-phase related components and including a demultiplexer receiving said sequence of first color mixture constituents for providing along a first data bus a sequence of only in-phase related components of said first color mixture constituents and for providing along a second data bus a sequence of only quadrature-phase related componenents