Adaptive comb filter for artifact-free decoding
US4979023A · kind A · utility
5Cited by
0References
1Claims
0Family size
Inventors
Key dates
| Filing date | Mar 30, 1989 |
| Grant date | Dec 18, 1990 |
| Priority date | — |
| Expiry date | Mar 30, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H21/0023
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An adaptive comb filter employs vertical and horizontal edge detectors to selectively activate a vertical high-pass filter and a horizontal band-pass filter during the occurrence of vertical and horizontal edges in a received television signal, for use in the chrominance/luminance separation process. Artifacts such as "hanging dots" and "crawling dots", inherent in prior art comb filter circuits during the occurrence of vertical and horizontal edges in the composite television signal, are greatly reduced in the process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.