Importance

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Abstract

A traffic information warning system for conveying first and second messages regarding a traffic situation from a traffic advisory site is disclosed. The system comprises a transmitter adapted for placement at the advisory site and a receiver. The transmitter includes an oscillator for transmitting a first carrier signal and a second carrier signal. The first carrier signal has a first discrete carrier frequency and the second carrier signal has a second discrete carrier frequency. The first and second discrete carrier signal frequencies are located at a frequency location. The first message of a traffic situation is reflective of the specific frequency locations of the first and second discrete frequencies. A modulator modulates the first carrier signal with a modulating signal reflective of the second message regarding the traffic situation. The second carrier signal comprises an unmodulated signal. The receiver includes scanning circuitry for scanning across a predetermined frequency range to detect the first and second carrier signals and circuitry responsive to the detecting means for determining the first message regarding the traffic situation. The receiver further includes a demodulator for retrieving the first retrieved modulating signal about the first carrier signal, and an annunciator for announcing the first and second messages regarding the traffic situation.

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First Claim