Adaptive arrangement for identifying a periodic signal

Details Adaptive arrangement for identifying a periodic signal Adaptive arrangement for identifying a periodic signal

1990-10-09

1992-06-02

Miller, Stanley D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307261, 328164, H03K 5153

Patent

active

051189674

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).

REFERENCES:
patent: 4069452 (1978-01-01), Conway et al.
patent: 4079327 (1978-03-01), Van Uffelen
patent: 4297676 (1981-10-01), Moriya et al.
patent: 4658368 (1987-04-01), Blais
patent: 4766332 (1988-08-01), Pelgrom et al.
patent: 4777629 (1988-10-01), Morris et al.
patent: 4916673 (1990-04-01), Morris et al.

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