Carrier recovery apparatus and methods for high-definition television receivers
US7424054B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 2003 |
| Grant date | Sep 9, 2008 |
| Priority date | — |
| Expiry date | Apr 4, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2027/0097
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A carrier recovery apparatus, which may used in a high-definition TV receiver, includes an error compensating unit, an error detecting unit, and an oscillator. The error compensating unit combines a complex input signal with a frequency signal to generate a complex output signal. The complex output signal includes an error reference signal. The error detecting unit determines a location of the error reference signal in the complex output signal based on a real part of the complex output signal, and generates an error signal based on the location of the error reference signal. The oscillator generates the frequency signal with a frequency that varies based on the error signal. The complex input signal may be a VSB signal that is represented as a complex number, and the error reference signal may be a PN63 signal in a field synchronization signal of the complex input signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.