Video display system using an improved color signal technique

Details Video display system using an improved color signal technique Video display system using an improved color signal technique

1991-01-22

1992-09-22

Coles, Sr., Edward L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 29, H04N 967

Patent

active

051502062

ABSTRACT:
A video display system such as a broadcast receiver or a studio monitor is designed to display both MAC-type input signals and HDTV-type input signals, only the latter being of constant luminance type. For MAC signals a normal Y, U, V to R, G, B, decoder matrix is used comprising amplifiers (18, 20, 22) resistors (24A, 24B, 26A, 26B, 28A, 28B, ) and further amplifiers (24, 26, 28). The output is applied to a CRT display device (30) having a conventional gamma factor. For HDTV signals, the decoder matrix is augmented by a correction matrix having six or eight circuit sections. Each circuit section comprises resistors (42, 44, 46), an operational amplifier (40), and circuitry including diodes (48, 50) for selecting the output only over a portion of the permissible color range.

REFERENCES:
patent: 3429987 (1969-02-01), Altmann
patent: 3588827 (1971-06-01), Roessel et al.
patent: 3729580 (1973-04-01), Schneider
patent: 4481529 (1984-11-01), Kerling
The Multi-Linear Matrix for a Constant Luminance Colour Television System, Percival, Nov. 1963.
HDTV-A Chance to Enhance Television Colorimetry, Roberts, Feb. 1990.
High Definition Television Production Standard-An Opportunity for Optimal Color Processing, Schafer, SMPTE Journal Jul. 1985, pp. 749-758.

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