Automatic Y-axis offset system

Details Automatic Y-axis offset system Automatic Y-axis offset system

1980-03-31

1981-11-17

Hubler, Malcolm F.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315389, H01J 2970

Patent

active

043013937

ABSTRACT:
An automatic Y-axis offset system for a cathode ray tube, which performs automatic positioning of a trace to a predetermined position on the cathode ray tube face such that the trace becomes visible, by applying a Y-axis offset voltage to the input signal voltage. The automatic positioning is performed when commanded by an operator through switch actuation. The offset voltage is produced by a feedback circuit which includes an amplifier receiving the input signal, a comparator for comparing an output voltage from the amplifier with a predetermined level, a counter which is enabled to count a clock signal so long as the level of output signal from the amplifier is different from the predetermined level, and a digital-to-analog converter which converts the count in the counter to an analog signal constituting the Y-axis offset voltage.

REFERENCES:
patent: 3396306 (1968-08-01), Mallebrein
patent: 3996582 (1976-12-01), Sinobad
patent: 4099092 (1978-07-01), Bristow

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