Method of and device for detecting the presence of a living bein

Details Method of and device for detecting the presence of a living bein Method of and device for detecting the presence of a living bein

1997-02-21

1998-06-02

Hofsass, Jeffery A.

Communications: electrical

Condition responsive indicating system

Specific condition

342 27, 367 93, G08B 1318

Patent

active

057606870

ABSTRACT:
The signal delivered by a Doppler sensor is treated after amplification, filtering and digitization by: means for determining the global energy of the digitized signal; autocorrelation test means for showing up a dominant frequency; a filter for rejecting that frequency; comparators for eliminating signals having energy less than a threshold; a filter for isolating a particular frequency band; and means for intercorrelation with a reference signal held in memory.

REFERENCES:
patent: 3614779 (1971-10-01), Sommer
patent: 3760400 (1973-09-01), Galvin et al.
patent: 4290126 (1981-09-01), McFadyen et al.
patent: 4400700 (1983-08-01), Rittenbach
patent: 4952939 (1990-08-01), Seed
patent: 4958638 (1990-09-01), Sharpe
patent: 5150099 (1992-09-01), Lienau
patent: 5345240 (1994-09-01), Frazier
patent: 5448501 (1995-09-01), Hablov
patent: 5576977 (1996-11-01), Eskildsen
Microprocessor controlled automatic clutter -Cancellation circuits for microwave systems to sense physiological movements remotely through the rubble (H.R. Chuang et al)--1990.

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