Data slice circuit separating data added to a signal superposed on a video signal based on slice level
US6912009B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 8, 2002 |
| Grant date | Jun 28, 2005 |
| Priority date | — |
| Expiry date | Aug 19, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/035
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A data slice circuit capable of generating an optimal data slice level and separating data for VBI signals of different specifications, provided with a line detection circuit for detecting any line on which a VBI signal having a CRI signal is superposed and outputting a line detection pulse only during the period and detecting any line on which a VBI signal having a reference signal is superposed and outputting another line detection pulse only during that period, a window pulse generation circuit for outputting pulses changing a period of averaging the VBI signal in accordance with the detection pulses, a data slice reference voltage detection circuit for sampling and holding an average voltage of the clamped VBI signal only while the output pulses are at a high level “H”, and a data slice level generation circuit for adding a direct current voltage changed in accordance with the detection pulsed to the output voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.