Video signal processing unit
US4513311A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 30, 1982 |
| Grant date | Apr 23, 1985 |
| Priority date | — |
| Expiry date | Mar 30, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/7908
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A processing circuit for a composite color television signal formed of a chrominance component and a luminance component includes a comb filter of the type including a 1H delay line. In order to process the chrominance component, the comb filter is followed by an operational circuit providing a difference signal representing vertical correlation of the input chrominance component for consecutive line intervals, and a feedback loop circuit for combining the input chrominance component with the feedback difference signal before application to the comb filter. A detecting circuit detects correlation of video information in the luminance component in vertically aligned portions of successive horizontal line intervals, and provides a detecting signal which is used to adjust the feedback loop gain on the feedback loop circuit in accordance with the detecting signal. The processing circuit can further comprise a luminance comb filter including the delay line and an additive combining circuit, which is followed by a subtractive combining circuit and a band pass filter having an input connected to an output of the subtractive combining circuit and an output connected to an input of the latt…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.