Method for noise suppression and noise-suppression circuit for video recorders
US5841934A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 8, 1996 |
| Grant date | Nov 24, 1998 |
| Priority date | — |
| Expiry date | Mar 8, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/7908
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A noise suppression apparatus and method for recorded luminance signals in which a level of an FM signal from the recording medium is detected, and the level of the recovered chroma signal is detected, the luminance signal is bandpass filtered and limited. A subtraction signal is generated based on the filtered and limited luminance signal and having magnitude based on the detected level of at least one of the chroma signal and the FM signal. The subtraction signal is subtracted from the luminance signal to generate a noise suppressed luminance signal. The passband of the bandpass filter may be varied based on at least one of the chroma signal and the FM signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.