G - Physics – 08 – B
Patent
G - Physics
08
B
349/30
G08B 13/16 (2006.01) G01S 15/88 (2006.01)
Patent
CA 1163704
ABSTRACT An ultrasonic surveillance system which emits pulse- -like ultrasonic waves to an area under surveillance, which statistically compares a reflected-wave pattern established by receiving ultrasonic waves reflected from the under surveillance with a predetermined reference pattern, and which produces an alarm signal when these two patterns are not in agreement. In order to exclude ultrasonic noise having a relatively small amplitude from the reflected-wave pattern, a difference component between a pattern of frequencies of emitted ultrasonic waves and a pattern of the other frequencies is used as the reflected pattern. The frequency components other than those of emitted ultrasonic waves are integrated and, when the integrated value exceeds a predetermined value, the transmission of an alarm signal is interrupted so as to prevent the system from being erroneously operated by ultrasonic noise having a large amplitude. The number of peak values in the reflected pattern is counted and, when the counted value exceeds a predetermined value, the transmission of an alarm signal is also interrupted.
424588
Ridout & Maybee Llp
Secom Co. Ltd.
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