Method for reducing noise and cross-color interference in television signals, and apparatus for performing the method
US5027194A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 31, 1989 |
| Grant date | Jun 25, 1991 |
| Priority date | — |
| Expiry date | May 31, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/646
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and an apparatus for the simultaneous reduction of noise and cross-color interference in television signals includes a picture processor having a recursive filter for processing a luminance signal and two chrominance signals. The picture processor also has a change detector connected to the recursive filter for determining filter coefficients for both chrominance signals from the luminance signal and feeding the filter coefficients as input signals to the recursive filter. The change detector for the luminance signal has comparison devices with variable thresholds and two evaluation circuits triggered by the comparison devices for defining the filter coefficients for the luminance signal and the chrominance signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.