Autoscan system for determining translation between satellite and cable frequencies
US7376387B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 28, 1999 |
| Grant date | May 20, 2008 |
| Priority date | — |
| Expiry date | Dec 28, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/20
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A translation table is provided for a set top box in order to convert satellite frequencies of a Satellite Master Antenna Television (SMATV) system to corresponding cable frequencies of a CATV distribution system. During an autoscan operation, the translation table is automatically populated with satellite frequencies and their associated cable frequencies. The satellite frequencies carry satellite QPSK signals, and the cable frequencies carry corresponding QAM signals. During autoscan, the cable frequencies are scanned. For each of the cable frequencies carrying a QAM signal, satellite service data is read from the corresponding QAM signal. The satellite service data includes the satellite frequencies. The satellite frequency contained in the satellite service data read from each QAM signal is stored in the translation table in association with the corresponding cable frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.