Video player with caption generator having character background provisions
US4477841A · kind A · utility
14Cited by
2References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 6, 1981 |
| Grant date | Oct 16, 1984 |
| Priority date | — |
| Expiry date | Oct 6, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/7755
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A filter limits the bandwidth of a caption video signal in a video disc player to minimize color beats when the caption signal is displayed along with a picture video signal on a television receiver. The filter delay, which would otherwise cause offset between the caption and an associated background signal used to enhance visibility of the caption, is compensated for by extending the time duration of each occurrence of the background signal by a multiple of the filter delay.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.