Precision time tracking line generator
US4491925A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 19, 1981 |
| Grant date | Jan 1, 1985 |
| Priority date | — |
| Expiry date | Jun 19, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G1/12
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A display system line generator network having an error correction feedback loop which achieves high positional accuracy for both plan position indicators PPI and synthetic character and line data. Digital reference position and relative beam motion data are fed into separate D/A converters. The staircase effect at the output of the D/A that processes the relative beam motion data is eliminated in a constant current integrator. The output of the integrator is combined with the reference position signal in a summing amplifier and the summed signal is fed to a deflection amplifier. A feedback circuit picks off the inputs to the summing amplifier and uses their comparison to synchronize time with beam position by compensating for errors due to component drift and aging.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.