Reducing steady state error in fixed point implementations or recursive filters
US8832169B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 10, 2011 |
| Grant date | Sep 9, 2014 |
| Priority date | — |
| Expiry date | Dec 25, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H2017/022
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
One feature includes a method for implementing a fixed point recursive filter that reduces or eliminates steady state error. The method comprises obtaining a first filter state value, processing the first filter state value to remove a scaling factor to obtain a second filter state value, ascertaining that the recursive filter has reached a steady state, determining a nonlinear drift parameter based on a difference between the first filter state value and the second filter state value multiplied by the scaling factor, and adjusting the second filter state value with the nonlinear drift parameter to reduce steady state error of the recursive filter. Ascertaining that the recursive filter has reached the steady state may include determining that a filter output value at time n is equal to a filter output value at time n−1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.