Automatic frequency control method and receiving apparatus using thereof
US5107335A · kind A · utility
6Cited by
10References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 27, 1990 |
| Grant date | Apr 21, 1992 |
| Priority date | — |
| Expiry date | Sep 27, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/015
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A second IF signal is counted either directly or indirectly. An AFC operation is performed based on the counting result. A plurality of count periods (A1, C1) are provided within a video signal period (Y+H) including a horizontal blanking period, and the plurality of count periods (A1, C1) are randomly shifted for each field. An AFC operation is performed based on a plurality of counting results in a plurality of field periods which correspond to one cycle of an energy diffusion signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.