Communications: electrical – Selective – Having indication or alarm
Patent
1979-04-13
1983-09-06
Groody, James J.
Communications: electrical
Selective
Having indication or alarm
455 99, 455152, 455228, 455345, G08G 100
Patent
active
044032080
ABSTRACT:
Warning-signal producing apparatus and system for a first motor vehicle responsive to a vehicle-presence-indicating radio wave signal produced by and emitted from a second motor vehicle within a certain distance of the first motor vehicle for effectively causing the production of a corresponding warning signal within the interior of the first motor vehicle and, in one form, for correspondingly attenuating, muting, or interrupting sound emitted by any simultaneously operating intertainment apparatus within the first-mentioned-motor vehicle. In one form, the second motor vehicle (often an emergency vehicle) is provided with a radio frequency transmitter adapted to produce and transmit a vehicle-presence-indicating radio frequency signal, and each other vehicle (such as the first vehicle mentioned above) which is intended to be warned of the presence of the second vehicle, is provided with radio-frequency-signal-receiving apparatus effectively tuned so as to receive the vehicle-presence-indicating signal transmitted from the second vehicle, and is further provided with apparatus responsive thereto for effectively causing the production of some type of perceptible warning signal to alert an occupant of the first motor vehicle of the nearby presence of the second motor vehicle. Both the transmitter and the receiver, in a preferred form, are provided with effectively distance-calibrated signal limiting or gate apparatus cooperable with each other to provide for the reception by the first vehicle of the signal transmitted by the second vehicle only at or less than a precisely calibrated desired distance.
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Dahl Frank L.
Hodgson R. W.
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