Video signal processing circuit for eliminating an interfering signal
US4291330A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 24, 1979 |
| Grant date | Sep 22, 1981 |
| Priority date | — |
| Expiry date | Apr 24, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/88
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A video signal processing circuit eliminates an interfering signal that is included in a video signal, and is especially effective for eliminating an intefering signal that results from reproducing a video signal that is recorded in successive slant tracks on a recording medium, such as magnetic tape. In the video signal processing circuit, a delay line delays at least the luminance component of the video signal by a predetermined number of horizontal line intervals, a first subtracting circuit combines the delayed luminance component with the undelayed luminance component to produce a first difference signal, a limter limits the first difference signal and presents the limited first difference signal to a second subtracting circuit, where the latter signal is subtractively combined with the delayed luminance signal to produce an output signal free of interfering signals. In order to improve the performance of the processing circuit, a high pass filter and an adder circuit can be included to pass the high frequency portion of the first difference signal around the limiter. Alternatively, a deemphasizing circuit and a preemphasizing circuit can be respectively included in advance of…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.