System and method for keying video information to electron...

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

H - Electricity

01

J

355/15

H01J 29/70 (2006.01) H04N 3/28 (2006.01)

Patent

CA 1110365

SYSTEM AND METHOD FOR KEYING VIDEO INFORMATION TO ELECTRON BEAM DEFLECTION Abstract In an image display, the video information is keyed to the position of the electron beam by sensing the beam deflection voltage. The keying system utilizes means for generating a reference voltage which is proportional to the anode voltage,and means for comparing the reference voltage with 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.

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