Circuit for correcting setup error in a color television receiver
US4084115A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 14, 1977 |
| Grant date | Apr 11, 1978 |
| Priority date | — |
| Expiry date | Feb 14, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N3/237
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A horizontal deflection circuit of a color television receiver includes a horizontal output transformer with a secondary winding across which a voltage is developed and includes a horizontal deflection winding coupled to a pincushion correction winding of a pincushion reactor. In response to the current flowing in the vertical deflection winding, the inductance of the pincushion correction winding varies in a manner providing for East-West pincushion distortion correction. For setup, in the service mode of operation, the vertical deflection circuit is disabled. A circuit, coupled to the pincushion reactor, adjusts the inductance of pincushion correction winding to compensate for a change in the inductance caused by disabling of the vertical deflection circuit for maintaining the voltage across the horizontal output transformer secondary winding substantially unchanged during setup.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.