System and method for keying video information to electron beam

Details System and method for keying video information to electron beam System and method for keying video information to electron beam

1977-02-22

1979-07-03

Hubler, Malcolm F.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315 12ND, H01J 2970

Patent

active

041601947

ABSTRACT:
In an image display, the video information may be keyed to the position of the electron beam by sensing the beam deflection voltage. A keying system utilizes means for generating a reference voltage which is proportional to the anode voltage and means for comparing the reference voltage to the deflection voltage for the electron beam. When a predetermined relationship between the two voltages, such as equality, is reached; the comparing means produces an output which indicates the deflected position of the electron beam. The output of the comparing means can be used to switch the video information to modulate the electron beam.

REFERENCES:
patent: 2736764 (1956-02-01), Bingley
patent: 2904722 (1959-09-01), Aiken
patent: 3147340 (1964-09-01), Ehrich

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