Circuitry for comb filtering PAL and NTSC video signals
US4961108A · kind A · utility
11Cited by
7References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 24, 1988 |
| Grant date | Oct 2, 1990 |
| Priority date | — |
| Expiry date | Oct 24, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/78
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Comb filter apparatus for comb filtering NTSC or video signals includes sampling circuitry to sample the video signal at 45 degrees relative to the I,Q or U,V axes. The sampled signal is coupled to delay circuitry arranged to concurrently provide video samples from three successive horizontal lines, designated top, middle and bottom. The video samples from the middle line are combined with samples alternately selected from the top and bottom lines to provide a comb filtered signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.