Communications: electrical – Audible indication
Reexamination Certificate
2005-02-15
2005-02-15
Tweel, John (Department: 2636)
Communications: electrical
Audible indication
C340S309900
Reexamination Certificate
active
06856242
ABSTRACT:
An automatic siren silencing device for false alarms, for use in an alarm system having a siren driver which powers a siren. A microcomputer monitors pulse signal characteristics of the siren driver, including duration of pulses and number of pulses, and compares these characteristics with predetermined pulse signal characteristics stored in a memory. A relay coil is energized by the microcomputer, controlling a relay switch which disconnects the siren from the siren driver when the pulse signal characteristics are indicative of a false alarm thereby silencing the siren. A user means is provided to adjust the predetermined pulse signal characteristics. Power to the microcomputer is provided by a capacitor, charged by the signal of the siren driver, whereby no battery or dedicated external power supply input is required. Indicator lights and a piezo element inform a user of siren silencing, and indicate the types of false alarms detected.
REFERENCES:
patent: 4568924 (1986-02-01), Wuthrich et al.
patent: 4630684 (1986-12-01), Cinzori et al.
patent: 4764755 (1988-08-01), Pedtke et al.
patent: 5093656 (1992-03-01), Dipoala
patent: 5815066 (1998-09-01), Pumilia
Spiral Technologies Ltd.
Tweel John
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