Carrier chrominance signal processing circuit
US4766486A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 9, 1986 |
| Grant date | Aug 23, 1988 |
| Priority date | — |
| Expiry date | Sep 9, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/7908
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A carrier chrominance signal processing circuit for use in an apparatus such as a video tape recorder is based upon a feedback comb filter for enhancing the S/N ratio of the playback carrier chrominance signal, and circuits for detecting vertical coherence in a playback luminance signal and carrier chrominance signal respectively. Loop feedback within the feedback comb filter is controlled in accordance with a plurality of specific combinations of conditions of vertical coherence and vertical non-coherence of the carrier chrominance signal and luminance signal, such as to minimize vertical color blurring being produced by the operation of the feedback comb filter while effectively suppressing noise components in the playback carrier chrominance signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.