Alarm signal processing means

Details Alarm signal processing means Alarm signal processing means

1991-09-13

1993-06-29

Mullen, Thomas

Communications: electrical

Condition responsive indicating system

Specific condition

340521, 340562, G08B 1318

Patent

active

052238172

ABSTRACT:
An intruder detector system such as a microwave fence having a transmitter 10 and receiver 12 produces a signal proportional to the disturbance created by an intruder. The signal is processed by a microwave detector 14 and processor 16 and supplied, as DC voltage output to two channels 18, 20. First channel 18 compares the DC voltage strength to a pre-set value stored in a first threshold detector/comparator 22. On the DC voltage exceeding the pre-set value an alarm relay 24 is actuated causing actuation of an alarm (not shown). Second channel 20 passes the voltage through a first filter 26 which removes high frequency signal variations characteristic of a fast moving intruder. Thus the signal which is compared with a second pre-set value stored in a second threshold detector/comparator 28 relates only to slow moving intruders and the preset value can therefore be set for a lower level of disturbance as would be caused by a crawling human intruder.

REFERENCES:
patent: 3885234 (1975-05-01), Fujimoto
patent: 3976958 (1976-08-01), Seidel
patent: 4225858 (1980-09-01), Cole et al.
patent: 4295132 (1981-10-01), Burney et al.
patent: 4383250 (1983-05-01), Galvin
patent: 4442514 (1984-04-01), Roth
patent: 4684932 (1987-08-01), Kupec et al.

Affiliated with

Also associated with

Rating

Alarm signal processing means does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Alarm signal processing means, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Alarm signal processing means will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1758532