Closed loop adaptive raster deflection signal generator

Details Closed loop adaptive raster deflection signal generator Closed loop adaptive raster deflection signal generator

1988-08-04

1989-10-17

Tarcza, Thomas H.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315367, 315398, 358150, H01J 2970, H01J 2954, H04N 506

Patent

active

048749923

ABSTRACT:
A raster deflection signal generator that generates deflection signals in accordance with sweep control signals provided by a programmable timing generator. The programmable timing generator stores digital signals representative of the desired sweep control signals so as to tailor the sweep timing to the input video channel. The digital sweep control signals are synchronized to the input video channel by locking a horizontal sync pulse generated by the programmable timimg generator to the horizontal sync pulse of the video input channel by a phase locked loop. Each deflection sweep is compared to a threshold voltage representative of screen center to provide a duty cycle signal in accordance with drift of the TV image from screen center. The duty cycle signal is filtered and sampled and fed back to the sweep generator so as to maintain the deflection sweeps properly centered.

REFERENCES:
patent: 4149264 (1979-04-01), Hamada et al.
patent: 4314183 (1982-02-01), Heuze et al.
patent: 4644340 (1987-02-01), Holloway et al.
patent: 4709268 (1987-11-01), Akimoto et al.
patent: 4729024 (1988-03-01), Kawai et al.
patent: 4779132 (1988-10-01), McBeath et al.

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