Variable picture size circuit for a television receiver
US4547708A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 22, 1983 |
| Grant date | Oct 15, 1985 |
| Priority date | — |
| Expiry date | Sep 22, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N3/223
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A horizontal deflection circuit periodically applies a horizontal trace voltage to a horizontal deflection winding for generating horizontal scanning current therein. A modulator circuit is responsive to control signals for varying the horizontal trace voltage to develop concurrent variations in the amplitude of the horizontal scanning current. A side pincushion control signal is applied to the modulator circuit to vary the horizontal trace voltage at a vertical rate for developing variations in the amplitude of the horizontal scanning current that produce side pincushion correction. A horizontal size control signal is applied to the modulator circuit to vary the horizontal trace voltage for changing the picture size in the horizontal direction. A vertical deflection circuit generates in a vertical deflection winding a vertical scanning current having an amplitude that varies with variations in a vertical size control signal for changing the picture size in the vertical direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.