Television synchronization system
US4864400A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 28, 1987 |
| Grant date | Sep 5, 1989 |
| Priority date | — |
| Expiry date | May 28, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/067
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A television synchronization system in which a bipolar signal having a waveform including a front porch (304), a negative polarity pulse, a positive polarity pulse and a back porch is used as a horizontal sync signal, and a composite signal having a waveform including the positive polarity pulse, the back porch, a negative polarity pulse with a wide pulse width, a front porch and a negative polarity pulse is used as a vertical sync signal. When separating and reproducing the sync signals from a television signal transmitted through a transmission line, deviation of the reference phase can be eliminated so that the accuracy of the reproduced phase is improved. Therefore, the television synchronization system is preferably used in a high definition television system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.