Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1984-04-27
1986-06-03
Masinick, Michael A.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358139, 315368, H04N 1702, H04N 1700, H01J 2970
Patent
active
045933081
ABSTRACT:
An improved system for the automatic correction of centering and convergence errors in a cathode ray tube display is disclosed. The system includes a first masked light sensor (12) positioned on the major axis of the display and a second masked light sensor (14) positioned on the minor axis of the display. A light blip generator (16) is responsive to the horizontal and vertical timing pulses for unblanking the video circuits during the horizontal and vertical blanking intervals in order to generate light pulses in the vicinities of said first and second light sensors. A microprocessor based feedback controller (10) is responsive to the outputs of the light sensors and programmed to iteratively generate correction signals whenever no output is received from one or both of the light sensors.
REFERENCES:
patent: 3479448 (1969-11-01), Kollsman
patent: 3962722 (1976-06-01), Ciciora
patent: 4001877 (1977-01-01), Simpson
patent: 4035834 (1977-07-01), Drury
patent: 4364079 (1982-12-01), Pons
patent: 4485394 (1984-11-01), Ghaem-Maghami et al.
patent: 4551748 (1985-11-01), Mattle
Dunnam Michael P.
General Electric Company
Masinick Michael A.
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