Emergency vehicle alert system

Details Emergency vehicle alert system Emergency vehicle alert system

2007-07-17

2007-07-17

Pham, Toan N. (Department: 2612)

Communications: electrical

Vehicle detectors

C340S935000, C340S425500, C340S435000

Reexamination Certificate

active

11201921

ABSTRACT:
The emergency vehicle alert system may be used for detection of selected sound frequency signals emitted by warning devices of vehicles. A sensor may sense a selected sound frequency signal spectrum and may be in communication with multiple operational amplifiers. The operational amplifiers may be biased to detect a warning device sound source within 50 feet and within 1,500 feet of the sensor. The detection of a warning device sound source may be communicated to a warning indicator to activate the warning indicator.

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