Character display circuit and method for superimposing character code during blanking period of video signal
US5541663A · kind A · utility
14Cited by
11References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 12, 1994 |
| Grant date | Jul 30, 1996 |
| Priority date | — |
| Expiry date | May 12, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N21/47
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A character display circuit in which a circuit for generating a character display timing signal in synchronism with vertical and horizontal synchronizing signals controls the frequency of dots constituting a character such that it is an integer multiple of the coding frequency for bits of a closed caption code, character coded data conforming to a format of the closed caption code is generated in synchronism with a predetermined horizontal synchronizing signal during the blanking period of a video signal using dot patterns for encoding character data, and the character coded data is superimposed on the video signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.