Reference voltage generation means for controlling a display
US4361043A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 3, 1980 |
| Grant date | Nov 30, 1982 |
| Priority date | — |
| Expiry date | Nov 3, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S7/52073
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.