专利名称：Reference voltage generation means for
controlling a display
发明人：Gary L. Engle申请号：US06/203656申请日：19801103公开号：US04361043A公开日：19821130
摘要：A position reference voltage for controlling the electron beam of a display in anultrasonic scanning system includes circuitry for receiving a position voltage from ascanner in the system, and a voltage from a variable voltage source. When the variablevoltage exceeds the position voltage the variable voltage is locked whereby a newposition voltage for the display is derived from the sum of the locked voltages and thescanner position voltage. The variable voltage source includes a digital counter and adigital to analog converter. A comparator compares the sum of the variable voltage andthe scanner position voltage, with a reference potential and a flip-flop responds to thecomparator to disable the counter when the summed voltages exceed the referencepotential.
申请人：GENERAL ELECTRIC COMPANY
代理机构：Flehr, Hohbach, Test, Albritton & Herbert
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