Digital Filters and corresponding filtering methods
US6507613B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 15, 1999 |
| Grant date | Jan 14, 2003 |
| Priority date | — |
| Expiry date | Jun 15, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H17/0264
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The invention proposes a digital filter adapted to transform an input digital signal into two output digital signals. The input digital signal includes input samples (xi). The first output digital signal includes output samples (y2i+1) of odd ranking, each equal to the input sample (x2i) of the same ranking decreased by the approximate value of a sum of input samples of even ranking respectively multiplied by first filtering coefficients (pk). The second output digital signal includes output samples (y2i) of even ranking, each equal to the input sample (x2i) of the same ranking decreased by the approximate value of a sum of output samples of odd ranking respectively multiplied by second filtering coefficients (uk). The second filtering coefficients (uk) are chosen from all the following sets of coefficients: (5/16, 5/16), (−1/16, 5/16, 5/16, −1/16) and (1/256, −15/256, 78/256, 78/256, −15/256, 1/256).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.