Chrominance channel bandwidth modification system
US4472746A · kind A · utility
1Cited by
5References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 28, 1981 |
| Grant date | Sep 18, 1984 |
| Priority date | — |
| Expiry date | Sep 28, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/825
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
When chroma signals U and V are respectively recorded in channels with bandwidths intended for NTSC chroma signals I and Q, distortion will result to one of the U or V signals due to the narrow bandwidth Q channel. To equalize this distortion between the U and V signals, they line to line alternate between the two channels. To avoid a line crawl, signals above the Q channel cut-off frequency are averaged.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.