Method and apparatus for filter tap expansion
US6519369B1 · kind B1 · utility
Assignees
Inventors
Key dates
| Filing date | Feb 12, 1999 |
| Grant date | Feb 11, 2003 |
| Priority date | — |
| Expiry date | Feb 12, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N19/98
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A method, apparatus, and article of manufacture for restoring a deteriorated signal to an undeteriorated signal. A deteriorated signal consists of a plurality of deteriorated and undeteriorated data points. For each deteriorated data point, a plurality of class types is created based upon characteristics of the area containing the deteriorated data point. The data point is classified with respect to one of the plurality of class types and assigned a corresponding input signal class. The undeteriorated signal is generated by adaptively filtering the deteriorated input signal in accordance with the input signal classification result. More than one classification method is used to create the plurality of class types. An adaptive tap structure may optionally be used based on the corresponding plurality of class types. Filter tap expansion is used to reduce the number of filter coefficients. The number of filter coefficients that must be stored can be reduced by allocating the same coefficient to multiple taps. This process is referred to as filter tap expansion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.