Digital waveform generator
US4687973A · kind A · utility
14Cited by
7References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 9, 1986 |
| Grant date | Aug 18, 1987 |
| Priority date | — |
| Expiry date | Jul 9, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G1/00
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a cathode ray tube display system, correction factors for X and Y position, astigmatism, focus and shading are recorded for preselected locations in digital memory circuits. Those correction factors bordering the actual beam position are selected and are converted to analog form. The correction factors applied to the system are determined by analogue interpolation, that is, the correction factors are combined in proportion to the proximity of the beam relative to those preselected locations where the correction factors were recorded. Use is made of resistance ladders and multiplexers in the interpolation circuits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.