Communications: electrical – Selective – Having indication or alarm
Patent
1978-10-20
1982-11-09
Caldwell, Sr., John W.
Communications: electrical
Selective
Having indication or alarm
340 63, 340 64, 340527, 340566, 73517R, 200 6145R, 307 10AT, B60R 2500
Patent
active
043587500
ABSTRACT:
In a vehicle alarm system there is provided apparatus for producing a digital control signal that defines a command to initiate a timing operation such as an entry delay. The apparatus comprises a transducer, preferably including a piezoelectric device, for generating an electrical waveform that, while the vehicle is undergoing vibration, has an acceleration-representing analog signal component. The apparatus further comprises threshold-setting circuitry responsive to the electrical waveform for causing the initiate-timing command to be given when the acceleration representing signal component exceeds a predetermined threshold.
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Caldwell Sr. John W.
Crosland Donnie Lee
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