Prealarm system for an anti-theft alarm
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United States of America Patent
Stats
-
Jun 1, 1993
Grant Date -
N/A
app pub date -
Mar 10, 1992
filing date -
Mar 10, 1992
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A prealarm system is provided for an anti-theft alarm where a signal from a displacement/vibration detector is picked up by a one-shot timer circuit. If no other activation signal is picked up after the first signal is received a main control alarm circuit is activated for (1) driving a siren circuit to generate a short chirp sound as an audible warning, and (2) a flashing circuit to flash a light for a preset period of time as a visible warning. If the number of activation signals received subsequent to the first are greater than a predetermined threshold number, or the activation signal continues for a predetermined period of time, the main control alarm circuit is activated for driving, (1) the siren circuit to give a normal audible signal alarm, and (2) both, the flashing circuit for flashing a light and the dome light control to provide visible signals.
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