VIR signal detector for a color television receiver
US4089025A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 6, 1976 |
| Grant date | May 9, 1978 |
| Priority date | — |
| Expiry date | Oct 6, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N17/04
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A VIR signal detector circuit for a color television receiver identifies the repetitive reception of a VIR color information signal on a predetermined horizontal line of video signal. The detection is accomplished with minimum interference from Gaussian and pulse-type noise to assure that VIR color control circuits in the receiver are activated only upon receipt of an actual VIR signal. The VIR signal detector operates by generating a viewing pulse of short duration during each horizontal line in which a VIR signal may be present. An accumulator, set to respond to a predetermined number of simultaneous detections of the viewing pulse and a video signal exceeding a predetermined value, generates a control signal indicating that a VIR signal is being received.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.