Desensitized filters
US8645441B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 1, 2008 |
| Grant date | Feb 4, 2014 |
| Priority date | — |
| Expiry date | Oct 5, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H2218/08
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A method and system for the design and implementation of filters is presented in which the filter's transfer function can be provided with a significant insensitivity to the filter's tap coefficient values. A desensitized digital filter includes a first halfband filter and a second filter coupled in cascade between an input of the digital filter and the output of the digital filter. In embodiments, the first filter has the transfer function F(z)=K(1+z−1)(1+z−1) wherein K≠0 is a scale factor. The digital filter may also interact with an up-sampler or a down-sampler. A desensitized Hilbert transformer includes an FIR filter having filter-tap coefficients whose absolute values equal the absolute values of the coefficients of an FIR filter F(z) for which the product (1+z−1)F(z) is a halfband filter coupled in cascade with a second filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.