Frequency-adaptive notch filter
US9503056B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 23, 2015 |
| Grant date | Nov 22, 2016 |
| Priority date | — |
| Expiry date | Oct 23, 2035 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B2560/0475
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
One apparatus includes a notch filter that has a state observer unit and a parameter adaptation unit. The state observer unit is configured to receive a sampled noisy electrical signal and a sampled filtered electrical signal, the state observer unit having an estimated noise signal output, the estimated noise signal output carrying an estimated noise signal to be subtracted from the sampled noisy electrical signal, resulting in the filtered electrical signal. The parameter adaptation unit is configured to receive the estimated noise signal and an error signal from the state observer unit. The parameter adaptation unit is also configured to determine, based on the estimated noise signal and the error signal, an updated estimated noise frequency, thereby causing the state observer unit to generate an updated estimated noise signal to be provided on the estimated noise signal output.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.