Synchronization signal detection in a digital television receiver
US7480009B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 19, 2005 |
| Grant date | Jan 20, 2009 |
| Priority date | — |
| Expiry date | Jul 18, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2027/0095
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A digital television (DTV) receiver is provided, comprising: a demodulator that demodulates television signals and outputs equalizer training signals in the form of real (I) and imaginary (Q) data; a sync signal detector, and a phase compensator that offsets the phase of the I and Q data based on the phase offset signal and outputs phase adjusted I data under control of the lock control signal. The sync signal detector comprises: a correlator that correlates the equalizer training signals including the I and Q data; a power calculator that calculates the sum of the power of the correlated I and Q data; a comparator that compares (the sum) against a preset threshold and outputs a compare indication signal; a sync lock controller that monitors the compare indication signal and outputs a lock control signal; and a phase calculator that calculates a phase of the equalizer training signals based on the I and Q data and outputs a phase offset signal based on the compare indication signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.