Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1995-02-09
1997-06-10
Hofsass, Jeffery
Communications: electrical
Condition responsive indicating system
Specific condition
340573, 340522, 367 93, 367 94, G08B 1318
Patent
active
056380488
ABSTRACT:
A sonar, lidar, or radar system generates an alarm signal if a child enters a swimming pool when the system is enabled, and includes multiple safeguards against sounding false alarms due to wind-activated waves in the pool or self interference arising from multi-path propagation of the sonar signals. An acoustic or electromagnetic receiver having a narrow bandwidth is employed to demodulate a composite signal spectrum produced by a target object such as a child and signals generated by wind-activated waves. It also performs an envelope amplitude monitoring function to suppress false alarms that might be generated by low amplitude envelopes of the type created by self interference. In a first embodiment, an alarm signal is generated only if the demodulating function and the envelope amplitude monitoring functions both indicate a legitimate alarm. In additional embodiments, still further redundancies are added to further decrease the probability of a false alarm, but none of the redundancies reduces the probability of recognizing legitimate signals.
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Hofsass Jeffery
Lee Benjamin C.
Mason, Jr. Joseph C.
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