Method and apparatus for filtering signals having a filter in which signal amplitudes are allocated to a quantized, two-dimensional reference plane
US5446502A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 6, 1993 |
| Grant date | Aug 29, 1995 |
| Priority date | — |
| Expiry date | Dec 6, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/409
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method and apparatus serves for filtering signals, whereby signal amplitudes can be allocated to a quantized, two-dimensional reference plane. For intensifying a useful signal part, a filtered signal can be added to an unfiltered input signal after constant parts as well as high-frequency parts have been filtered out. After a frequency-dependent filtering of the signal part to be filtered, components of the signal part to be filtered which have an amplitude above a prescribable threshold are eliminated in at least one contour filter stage. The threshold is adaptively adjusted dependent on an amplitude of the input signal. Over and above this, the output signal of the contour filter stage is subtracted from the output signal of the frequency-dependent filter for generating the overall filter signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.