Sync suppression television security system with addressable sync restoration
US6292567A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 26, 1998 |
| Grant date | Sep 18, 2001 |
| Priority date | — |
| Expiry date | Aug 26, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/44
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A television transmission security system, including scrambling a television signal by suppressing at least one of the horizontal sync pulse and vertical blanking interval of the television signal; transmitting the scrambled television signal; generating, and separately transmitting along with the scrambled television signal, a pilot carrier that includes timing information corresponding to the horizontal sync pulse and/or vertical blanking interval; and descrambling the scrambled television signal including receiving the pilot carrier and periodically suppressing, in accordance with the timing information included in the pilot carrier, video information of the television signal to an extent whereby at least one of the horizontal sync pulse and vertical blanking interval becomes detectable by a television receiver, thereby initiating organized receipt and display of the television signal. In addition to the sync suppression scrambling device and method, a sync restoration descrambling device, and the method it performs, are disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.