Noise reducer circuit for video signal
US5021884A · kind A · utility
3Cited by
7References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 15, 1990 |
| Grant date | Jun 4, 1991 |
| Priority date | — |
| Expiry date | Mar 15, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/21
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a video signal noise reducer circuit, an output video signal is delayed in a frame memory, then substracted from an input video signal, and the resultant difference signal then passed through a high pass filter. The difference signal and the filter output signal are then compared, and the one of these signals currently having the smaller absolute amplitude is modified by an amplitude-dependent feedback factor and then subtracted from the input video signal to obtain the output video signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.