MAC vertical synchronizing signals
US4639764A · kind A · utility
1Cited by
2References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 23, 1984 |
| Grant date | Jan 27, 1987 |
| Priority date | — |
| Expiry date | Mar 23, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N11/08
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Vertical synchronization information in a multiplexed analogue component (MAC) television signal is included in a line scan period, the amplitudes of the waveform being chosen so as to represent a position in the color space outside that occupied by the picture signal; preferably, the amplitudes are chosen to be at the limits of the picture signal amplitude. By these means, the normal horizontal synchronization information can still be included in the form of transitions 1 and 2, and the chance of the synchronization and picture signals interfering with each other is minimized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.