Digital filter
US7995690B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 15, 2008 |
| Grant date | Aug 9, 2011 |
| Priority date | — |
| Expiry date | Feb 19, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H17/025
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Digital filter (104), comprising: a first frequency shifting mechanism (106) configured to shift an input spectrum (H(f)) of an input signal (100) by a first frequency distance (F1) to obtain a shifted frequency signal (122) with a shifted spectrum; a filter (108), configured to filter said shifted frequency signal with a predetermined transfer function to obtain a filtered signal (130); and a signal processor (110), said signal processor including: an adder (202), and at least a second frequency shifting mechanism (222), said signal processor (110) being configured to generate an output signal (140), which is a sum of said filtered signal (130) and said shifted frequency signal (122) and said output signal (140) has an output spectrum, which is shifted by a second frequency distance (DF) with respect to said shifted spectrum, wherein said second frequency distance (DF) is independent of said first frequency distance (F1).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.