Apparatus and methods for providing close captioning in a digital program services delivery system
US5438370A · kind A · utility
62Cited by
2References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 14, 1994 |
| Grant date | Aug 1, 1995 |
| Priority date | — |
| Expiry date | Jul 14, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/445
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An apparatus for providing close captioning in a digital program services delivery system comprises: a rate converter circuit for receiving video codes and outputting video data; a video decoder circuit for receiving the video data and outputting digital Y, U, V data; a digital to analog converter/analog encoder circuit for converting the Y, U, V data into an analog video signal in a prescribed format; a line 21 former circuit for receiving close captioning digital data and forming a line 21 analog signal; and a multiplexor for inserting the line 21 analog signal into the analog video signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.