Circuit and method for correcting side pincushion distortion and regulating picture width
US4309640A · kind A · utility
4Cited by
6References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 25, 1980 |
| Grant date | Jan 5, 1982 |
| Priority date | — |
| Expiry date | Jan 25, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N3/22
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A circuit within a cathode-ray tube electromagnetic deflection system for correcting side pincushion distortion and regulating picture width independent of changes in the video line rate. The circuit employs a predistorted AC reference signal and a second DC reference signal in a closed-loop manner to cause a deflection current to describe precisely an ideal waveform defining simultaneously both pincushion correction and picture width regulation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.