Television receiver with a deflecting oscillator that has the additional function of controlling line generators that superimpose alphanumeric and/or graphic characters on the screen
US5767918A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 21, 1995 |
| Grant date | Jun 16, 1998 |
| Priority date | — |
| Expiry date | Aug 21, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/445
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A television receiver providing a stable image whether or not a composite color signal is present, in which a transmitter-recognition processes the television synchronization signals of the composite color signal. A character generator displays alphanumeric as well as graphic characters. The deflection generators and the character generator are operative with TV signals as well as characters that are alphanumeric as well as graphic. The deflection generators and the character generator are driven by control signals. An oscillator controls the deflection generators, and a phase comparator operates in the presence of synchronization signals to synchronize the oscillator. The phase comparator receives no signals from the input terminal when no synchronization signals are present, so that the oscillator oscillates at a fixed preadjustable frequency to provide a stable image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.