Reference voltage generation means for controlling a display

Details Reference voltage generation means for controlling a display Reference voltage generation means for controlling a display

1980-11-03

1982-11-30

Kreitman, Stephen A.

Measuring and testing

Vibration

By mechanical waves

128660, G01N 2900

Patent

active

043610439

ABSTRACT:
A position reference voltage for controlling the electron beam of a display in an ultrasonic scanning system includes circuitry for receiving a position voltage from a scanner in the system, and a voltage from a variable voltage source. When the variable voltage exceeds the position voltage the variable voltage is locked whereby a new position voltage for the display is derived from the sum of the locked voltages and the scanner position voltage. The variable voltage source includes a digital counter and a digital to analog converter. A comparator compares the sum of the variable voltage and the scanner position voltage, with a reference potential and a flip-flop responds to the comparator to disable the counter when the summed voltages exceed the reference potential.

REFERENCES:
patent: 4172386 (1979-10-01), Cribbs et al.
patent: 4204433 (1980-05-01), Cribbs et al.
patent: 4206654 (1980-06-01), Keller et al.

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