Blanking signal generator for a subcarrier locked digital PAL signal
US4663654A · kind A · utility
5Cited by
15References
19Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 27, 1985 |
| Grant date | May 5, 1987 |
| Priority date | — |
| Expiry date | Sep 27, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/44
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Non-orthogonality of the blanking region information caused by the 25 Hz offset in a digital PAL-encoded color television signal is corrected by a dynamic offset circuit. To this end, a plurality of waveforms describing the envelopes of the blanking, sync and burst are stored, and during video signal processing are sequentially addressed at a 25 Hz rate. The resulting assembled output blanking information is orthogonal to the television scanning frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.