Cathode-ray tube image presentation system of the indexing type

Details Cathode-ray tube image presentation system of the indexing type Cathode-ray tube image presentation system of the indexing type

1972-01-03

1976-08-24

Stellar, George G.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 924

Patent

active

039770222

ABSTRACT:
A color television image presentation cathode-ray tube with running indexing elements as the beam scans horizontally across the stripes, an index signal is produced representative of beam position with respect to the different colored stripes. The minimum intensity of the beam while scanning the image-presentation portion of the cathode-ray tube is automatically maintained at a near-optimum value sufficient to produce an adequate strength of indexing signal without unduly illuminating those portions of the picture intended to be black. When the strength of the beam current would otherwise tend to become too small, the blackest part of the picture is shifted in the direction to increase the beam intensity and the indexing signals. Sensing the index signal strength is made to be ineffective when the beam scans beyond the confines of the area containing the indexing elements by deriving a signal representing the cathode-ray tube cathode current, averaged over a short interval, and operating an electronic switch to disconnect the control means from the source of index signals only when said cathode current is above a predetermined minimum and the index signals are below a predetermined level. This same arrangement initiates beam blanking, and the end of the horizontal fly-back pulse initiates application of a pedestal pulse to control the beam-intensity at the beginning of each horizontal line to provide the beam current for energizing starting index elements. The pedestal is automatically terminated in response to the occurrence of proper signal from the index circuits; and the beam intensity thereafter is controlled on each line by the picture signal as above.

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