Video processor employing variable amplitude compression of the chrominance component
US4316213A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 23, 1980 |
| Grant date | Feb 16, 1982 |
| Priority date | — |
| Expiry date | Sep 23, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/793
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A composite video signal is separated into luminance and chrominance components which are processed in separate channels having transfer functions which differ in terms of frequency response and large signal amplitude response. The luminance channel subjects the luminance signal to high frequency preemphasis and to hard limiting or clipping at predetermined fixed levels. The chrominance channel exhibits a substantially uniform amplitude response and a variable compression characteristic dependent upon the chrominance signal level, a sum of chrominance and processed luminance signals or a composite output signal formed by a sum of processed chrominance and processed luminance signals. The composite signal is suitable for application to a picture carrier frequency modulator whereby an FM signal is produced suitable for video disc or tape recording and in which a tendency for luminance-chrominance crosstalk or interference is minimized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.