G - Physics – 08 – B
Patent
G - Physics
08
B
349/30, 343/49
G08B 13/18 (2006.01)
Patent
CA 1102436
ABSTRACT OF THE DISCLOSURE An intrusion alarm of the kind in which a radiation field is transmitted in an area to be supervised; the reflected field is received and compared with the transmitted field, and a comparison signal is produced the frequency of which is indicative of the speed of movement of an object in the supervised area. A signal processor receives the comparison signal and generates an alarm if the comparison signal contains components in a selected frequency range. The processor includes a unique filter block which removes unwanted frequency components outside the range. The filter block includes a pulse generator which generates a constant amplitude pulse train, each pulse corresponding to a pulsation of the comparison signal, and control elements which control the duty cycle of the pulse train so that as the frequency of the comparison signal increases, the average level of the pulse train first increases and then decreases. The pulse train is integrated and operates an alarm signal generator when its average level rises above a preselected level.
262685
Bereskin & Parr
Contronic Controls Limited
LandOfFree
Filter system and method for intrusion alarm does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Filter system and method for intrusion alarm, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Filter system and method for intrusion alarm will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-950616