Control circuitry for an adaptive multistandard video comb filter
US5016092A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 3, 1990 |
| Grant date | May 14, 1991 |
| Priority date | — |
| Expiry date | Oct 3, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/642
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A multimode comb filter for comb filtering, e.g., NTSC and/or video signals includes delay means for concurrently providing video signals representing first, second and third adjacent horizontal lines. First and second combining means coupled to the delay means provide alternate 1-H comb filtered signals in both the NTSC and modes. Control circuitry coupled to the delay means generates a control signal for adaptively selecting the one of the alternate 1-H comb filtered signals or appropriate proportions of both alternate 1-H comb filtered signals to form an output comb filtered signal. In the NTSC mode the control circuitry generates the control signal from sums of vertically aligned pairs of samples from said first and second lines and from said second and third lines. In the mode the control signal is generated from alternating sums and differences of vertically aligned pairs of samples from said first and second lines and from said second and third lines.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.