Method and apparatus for decoding data encoded in the horizontal overscan portion of a video signal
US6281939A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 12, 1998 |
| Grant date | Aug 28, 2001 |
| Priority date | — |
| Expiry date | Nov 12, 2018 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA63H2200/00
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for decoding data encoded in the horizontal overscan portion of a video signal. A video data detector is configured to decode data encoded in a video signal in a first type of video signal format, such as NTSC. When the detector receives the video signal, it enters a "fast acquisition" loop in which it attempts to decode a sequence of valid data from several consecutive frames of the video signal. If the detector cannot decode a sequence of valid data from the consecutive frames of the video signal, the detector is reconfigured to decode data encoded in the video signal in a second type of video signal format, such as PAL. The detector then attempts to decode a sequence of valid data from the next several consecutive frames of the video signal. If the detector is unable to decode a sequence of valid data from the consecutive frames, the detector is reconfigured for the first type of video signal format and the above process repeats. If the detector decodes a sequence of valid data in the several consecutive frames of the video signal, the detector enters a "controlled persistence" loop. In the controlled persistence loop, the detector continues to decode data…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.