Adaptive arrangement for identifying a periodic signal
US5118967A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 9, 1990 |
| Grant date | Jun 2, 1992 |
| Priority date | — |
| Expiry date | Oct 9, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R23/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An adaptive arrangement for the identification of a periodic input signal (U.sub.S), for example, a signal supplied by magnetic field speed sensors. An evaluation circuit (11) is provided for digitizing the signal (U.sub.S) and for detecting the extreme values thereof, an interference-free output signal being present at the output of the evaluation circuit (11) in the event of small interferences which are less than a presettable minimum turn-over voltage (U.sub.M). In the event of larger interferences, subsequent means are provided for detecting the fundamental oscillation of the signal (U.sub.S). The subsequent means (12, 13) include a mean value producing circuit (12) and a comparator (13). The comparator compares the digitized signal (U.sub.SD) with a reference value signal (U.sub.V) which the mean value producing circuit (12) recursively forms from the extreme values of the signal (U.sub.S). The comparator produces an interference-free output signal (U.sub.A) which is proportional to the fundamental oscillation frequency of the periodic signal (U.sub.S).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.