Adaptive sinusoidal interference filter
US4589083A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 14, 1985 |
| Grant date | May 13, 1986 |
| Priority date | — |
| Expiry date | Jun 14, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H21/0021
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The invention relates to an adaptive filtering system for cancelling one or more sinusoidal interference signal contained with a desired signal in an incoming signal. A phase-locked loop is used to track a sinusoidal interference frequency and to synthesize various synchronous in-phase/in-quadrature square wave signals. Each of these signals is weighted in accordance with variations in the amplitude and the phase of the sinusoidal interference signal and the weighted square wave signals are combined together with the incoming signal so as to deliver the desired signal substantially free from any sinusoidal interference signal. In the case of multiple correlated signals, the instant filtering system gives a steady state performance substantially better than that of the well known Widrow-Hoff adaptive notch filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.