Communications: electrical – External condition vehicle-mounted indicator or alarm – Highway information
Patent
1995-11-29
1997-01-14
Hofsass, Jeffery
Communications: electrical
External condition vehicle-mounted indicator or alarm
Highway information
340902, 340903, 340904, 340906, 455 341, 455 342, 455 59, G08G 109
Patent
active
055944329
ABSTRACT:
A traffic information warning system for conveying traffic information from a traffic advisory site to a vehicle is disclosed. The traffic warning site comprises an emergency vehicle, a roadside hazard, or the like. The system comprises a transmitter adapted for placement at the advisory site and a receiver adapted for placement at the vehicle. The transmitter includes a first oscillator for transmitting a first carrier signal having a first carrier frequency and a second oscillator for transmitting a second carrier signal having a second carrier frequency. The first carrier frequency and the second carrier frequency are spaced apart by a predetermined frequency difference. The transmitter also includes a modulator for modulating both carrier signals with an identical modulating signal reflective of a traffic situation. The receiver includes scanning circuitry, in the form of a microprocessor, for scanning across a predetermined frequency range to detect carrier signals separated by the predetermined frequency difference and a demodulator for retrieving a first retrieved modulating signal about the first carrier signal and a second retrieved modulating signal about the second carrier signal. The receiver also uses the microprocessor to compare the first retrieved modulating signal to the second retrieved modulating signal and to determine whether the first and second retrieved modulating signal are identical. Additionally, the receiver includes an announcing device for announcing a message regarding the traffic situation.
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Oliva David C.
Rogers Max W.
Cobra Electronics Corp.
Hofsass Jeffery
Pope Daryl C.
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