Threshold crossing detection with improved noise rejection

Details Threshold crossing detection with improved noise rejection Threshold crossing detection with improved noise rejection

1990-03-05

1991-05-28

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307360, 328164, H03K 5153

Patent

active

050197223

ABSTRACT:
A detection scheme processes the output signal from a sensor so as to provide an ultimate output signal that is more noise resistant and that has a transition representative of a threshold crossing in the sensor signal. A key part of the detection scheme utilizes an integrated version of the sensor's output signal and compares it to two reference levels. These reference levels are selected to be near the opposite extremes of the amplitude excursions of the integrated sensor signal. Each time the reference levels are exceeded, a binary signal is latched to one of two levels (e.g. high, low), and is further processed to provide the ultimate output signal that is free of multiple, unwanted transitions in the presence of noise.

REFERENCES:
patent: 3727079 (1973-04-01), Garrett
patent: 3801830 (1974-04-01), Boyer
patent: 3944936 (1976-03-01), Pryor
patent: 3991733 (1976-11-01), Harris
patent: 4045743 (1977-08-01), Walker
patent: 4789838 (1988-12-01), Cheng
patent: 4795915 (1989-01-01), Sun et al.
patent: 4924483 (1990-05-01), Cho

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