Merged multi-stage comb filter with reduced operational requirements
US5835390A · kind A · utility
Assignees
Inventor
Key dates
| Filing date | Dec 27, 1995 |
| Grant date | Nov 10, 1998 |
| Priority date | — |
| Expiry date | Dec 27, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H17/0664
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A digital filter is provided for achieving substantial attenuation of aliasing or imaging bands of a signal to be filtered. The digital filter employs a comb filter technique, wherein the comb filter can perform decimation or interpolation, depending upon its application. The comb filter is a multi-stage element, having more than one stage, and having an overall word length, W.sub.L, optimally reduced. The total number of terms within the cumulative set of stages is also optimally reduced. The comb decimation or interpolation filter architecture is therefore of minimum size if employed in hardware, or utilizes minimal operations if employed in software. A filter element within the comb decimation or interpolation filter includes a z-transform C.sub.K (Z) term. The filter element can be reduced to a simple z-transform 1+z.sup.-1 term if the stage of interest includes a decimate-by-two or interpolate-by-two rate change switch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.