| 摘要 |
<p>A traffic information warning system (10) for conveying traffic information from a traffic advisory site to a vehicle (16) is disclosed. The system (10) comprises a transmitter (18) adapted for placement at an advisory site and a receiver (20) adapted for placement at a vehicle (16). The transmitter (18) includes a first oscillator (22) for transmitting a first carrier signal and a second oscillator (24) for transmitting a second carrier signal. The first carrier signal frequency and the second carrier signal frequency are spaced apart by a predetermined frequency difference. The receiver (20) includes scanning circuitry, to detect carrier signals separated by the predetermined frequency difference and a demodulator (29) 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 (20) also uses a microprocessor (28) to compare the first retrieved modulating signal to the second retrieved modulating signal. The receiver includes an announcing device (31, 32).</p> |
