Digital television receiver and method of recovering incoming digital television signal
US7218359B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 26, 2004 |
| Grant date | May 15, 2007 |
| Priority date | — |
| Expiry date | Dec 23, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/4382
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A digital television receiver includes a tuner for down-converting an incoming signal to produce a down-converted signal according to a local oscillator signal corresponding to a selected channel. A filter is coupled to the tuner for filtering the down-converted signal to produce an intermediate frequency (IF) signal. A carrier recovery unit is coupled to the filter for locking to a carrier frequency of the IF signal, and a pre-shift unit is coupled to the tuner. By shifting the local oscillator signal in a first direction by a predetermined first frequency shift in a first phase of carrier recovery, and then by shifting the local oscillator signal in a second direction by a second frequency shift in a second phase of carrier recovery, the pre-shift unit ensures a pilot tone of a selected channel is not filtered from the down-converted signal by the filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.