Dual mode QAM/VSB receiver
US6842495B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 3, 1999 |
| Grant date | Jan 11, 2005 |
| Priority date | — |
| Expiry date | Nov 3, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N11/24
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A television receiver system capable of receiving and demodulating television signal information content that has been modulated and transmitted in accordance with a variety of modulation formats is disclosed. In particular, the system is able to accommodate receipt and demodulation of at least 8 and 16-VSB modulated signals in order to support US HDTV applications, as well as 64 and 256-QAM modulated signals, for European and potential US CATV implementations. The system includes carrier and timing recovery loops adapted to operate on an enhanced pilot signal as well as decision directed carrier phase recovery loops. Phase detectors operate on I and Q rail signals, or generate a Q rail from a Hilbert transform of the I rail. Decision directed loops incorporate a trellis decoder in order to operate on sequence estimated decisions for improved reliability in poor SNR environments.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.