2-line YC separation device
US5959695A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 18, 1997 |
| Grant date | Sep 28, 1999 |
| Priority date | — |
| Expiry date | Apr 18, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/78
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A 2-line YC separation device reduces the number of delay circuits used for horizontal scanning time delay and minimizing arithmetic operation errors of comb-line filters. The device comprises a first delay circuit for delaying an input video signal for a horizontal scanning period; a first band-pass filter circuit whose input is the input video signal, a second band-pass filter circuit whose input is the output signal of the first delay circuit, a Y-correlation detector whose input is the output signals of the first and second band-pass filter circuits, a C-correlation detector whose input is the output signals of the first and second band-pass filter circuits, a second delay circuit for delaying the output signal of the Y-correlation detector for a horizontal scanning period, a third delay circuit for delaying the output signal of the C-correlation detector for a horizontal scanning period; and an operational circuit whose input is the output signals of the Y-correlation detector and C-correlation detector and the output signals of the second and third delay circuits.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.