Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1974-11-27
1976-06-08
Griffin, Robert L.
Facsimile and static presentation processing
Static presentation processing
Attribute control
178DIG4, H04N 962
Patent
active
039627225
ABSTRACT:
Patterns indicative of the characteristics of contrast, brightness, color and tint are displayed on the picture tube of the television receiver. A plurality of photocells develop corresponding electrical signals responsive to the patterns. The signals drive peak detectors, the outputs of which are sampled at a regular rate. A neutral density filter is between the brightness pattern and its photocell, and when the sampled contrast and brightness outputs are subtracted in a subtractor, a null is obtained at the desired ratio. Color filters are interposed between the tint and color patterns and photocells and at the desired settings, subtraction of their outputs in a subtractor yields zero. A plurality of bi-directional motors are engageable with the receiver contrast, tint, brightness and color level adjustable elements. The contrast and tint adjustment elements are driven from the respective subtractor outputs, whereas the brightness adjustable element is controlled by the brightness peak detector output directly and the color level adjustable element is controlled by the sum of the color and tint peak detector outputs. The motors are stopped when all patterns correspond to desired settings. The method of automatically setting up a color television receiver is also described.
REFERENCES:
patent: 2701275 (1955-02-01), Hulst
patent: 2752418 (1956-06-01), Clapp
patent: 2910615 (1959-10-01), Moulton et al.
patent: 3401331 (1968-09-01), Mussulman
patent: 3678392 (1972-07-01), Houghton
patent: 3804531 (1974-04-01), Kosaka et al.
Camasto Nicholas A.
Godfrey R. John
Griffin Robert L.
Zenith Radio Corporation
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