Method and system for multiple field modulation
US7587121B1 · kind B1 · utility
3Cited by
6References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 20, 2004 |
| Grant date | Sep 8, 2009 |
| Priority date | — |
| Expiry date | Feb 28, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/8205
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system for selectively increasing and decreasing the intensity of scan lines in a plurality of fields of a video signal over a time interval and not increasing or decreasing the intensity of the video scan lines in the remaining plurality of frames, thereby enabling a decoder to use an average intensity value comparison or to accumulate the differences in signal strength when fields are changing state from encoded to unencoded or encoded to unencoded to determine whether an auxiliary signal is present during the time interval.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.