Method and apparatus for the suppression of interference signals in a useful signal
US4243045A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 23, 1979 |
| Grant date | Jan 6, 1981 |
| Priority date | — |
| Expiry date | Jan 23, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S128/901
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
In an exemplary embodiment, the interference signals can occur as a mixture consisting of narrow interference pulse peaks of high amplitude and interference hum. It is desirable that such interference peaks and interference hum in a useful signal be suppressed without mutual influencing. To this end, an occurring useful signal having possibly superimposed interference signals is supplied to an interference hum filter. The filtered-out interference hum component is opposingly superimposed on the original signal for the purpose of compensation of the interference hum. This applies only for such a length of time as there are no interference pulse peaks recognized by a recognition installation. If such an interference pulse peak is recognized, the filter is disconnected from the input signal and switched over to self-oscillation operation. An artificial oscillation with an amplitude and frequency equal to that of the previously selected interference hum component is then generated without a phase jump and superimposed on the useful signal. The interference pulse peak is simultaneously blanked out. The exemplary embodiment can be particularly utilized in the case of electrocardiogram pr…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.