Carrier tracking loop lock detector
US7421042B2 · kind B2 · utility
0Cited by
6References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 12, 2003 |
| Grant date | Sep 2, 2008 |
| Priority date | — |
| Expiry date | Jul 3, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/426
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An ATSC (Advanced Television Systems Committee) VSB (Vestigial Sideband) receiver includes a carrier tracking loop (CTL) for processing a received ATSC VSB signal and a CTL lock detector. The CTL lock detector includes an averaging filter for averaging the down-converted received ATSC VSB signal to provide a DC offset, an estimator for providing an estimate of the DC offset, and a comparator for providing a lock signal as a function of a comparison between the estimate of the DC offset and the DC offset, wherein the lock signal is representative of either a locked condition or an unlocked condition of the CTL.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.