Pattern comparison ultrasonic surveillance system with noise suppression
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United States of America Patent
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-
Feb 12, 1985
Grant Date -
N/A
app pub date -
Jan 7, 1982
filing date -
Aug 20, 1980
priority date (Note) -
Expired
status (Latency Note)
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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. According to this system, the alarm signal is prevented from being erroneously produced by ultrasonic noises.
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