Descrambler apparatus
US4614970A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 13, 1983 |
| Grant date | Sep 30, 1986 |
| Priority date | — |
| Expiry date | Dec 13, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/1713
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A descrambler apparatus for use with a video transmitter which transmits scrambled video transmission without detectable horizontal or vertical synchronizing pulses but with a descramble signal which occurs at a random time in each frame and which is coded with information indicating the length of time that the signal precedes a fixed preselected point in the transmitted frames. The descrambler apparatus detects the coding of each descramble signal and, after a length of time corresponding to the coding, generates a full frame sequence of horizontal and vertical sync pulses starting at the preselected point in a frame. The generated sync pulses are combined with the received video signals to produce a properly synchronized video signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.