Adaptive filter
US7299251B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 25, 2001 |
| Grant date | Nov 20, 2007 |
| Priority date | — |
| Expiry date | Oct 25, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H21/003
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An adaptive filter is implemented by a computer (10) processing an input signal using a recursive least squares lattice (RLSL) algorithm (12) to obtain forward and backward least squares prediction residuals. A prediction residual is the difference between a data element in a sequence of elements and a prediction of that element from other sequence elements. Forward and backward residuals are converted at (14) to interpolation residuals which are unnormalized Kalman gain vector coefficients. Interpolation residuals are normalized to produce the Kalman gain vector at (16). The Kalman gain vector is combined at (18) with input and reference signals x(t) and y(t), which provides updates for the filter coefficients or weights to reflect these signals as required to provide adaptive filtering.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.