Training a recursive filter by use of derivative function
US5905659A · kind A · utility
14Cited by
8References
14Claims
0Family size
Inventor
Key dates
| Filing date | Oct 7, 1997 |
| Grant date | May 18, 1999 |
| Priority date | — |
| Expiry date | Oct 7, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H21/0012
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A method of training a recursive filter comprises updating recursive parameters of the filter with delta values computed from sampling of an error signal and obtaining derivative terms of the output signal with respect to the parameters. Adaptation using derivatives for FIR filters is known, but this technique was not available for IIR filters because of the unavailability of the derivative values. However, when it is realized that the derivative itself is recursive, a parameter derivative function is obtained which will produce derivative terms for updating the filter parameters with acceptable filter performance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.