Traffic information warning system
First Claim
1. A traffic information warning system for conveying a message regarding a traffic situation from a traffic advisory site to a vehicle, the system comprising a transmitter adapted for placement at the advisory site and a receiver adapted for placement at the vehicle, wherein:
- the transmitter includes a first oscillator for transmitting a first carrier signal and a second oscillator for transmitting a second carrier signal, the first carrier signal having a first carrier frequency and the second carrier signal having a second carrier frequency, a modulator for modulating both carrier signals with an identical modulating signal reflective of a traffic situation, the first carrier frequency and the second carrier frequency being spaced apart by a predetermined frequency difference; and
,the receiver includes scanning circuitry for scanning across a predetermined frequency range to detect carrier signals separated by the predetermined frequency difference, a demodulator for retrieving a first retrieved modulating signal about the first carrier signal, means for comparing the first retrieved modulating signal to a series of acceptable stored traffic messages and for determining whether the first retrieved modulating signal matches one of the acceptable stored traffic messages, and means for announcing a message regarding the traffic situation.
7 Assignments
0 Petitions
Accused Products
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.
61 Citations
62 Claims
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1. A traffic information warning system for conveying a message regarding a traffic situation from a traffic advisory site to a vehicle, the system comprising a transmitter adapted for placement at the advisory site and a receiver adapted for placement at the vehicle, wherein:
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the transmitter includes a first oscillator for transmitting a first carrier signal and a second oscillator for transmitting a second carrier signal, the first carrier signal having a first carrier frequency and the second carrier signal having a second carrier frequency, a modulator for modulating both carrier signals with an identical modulating signal reflective of a traffic situation, the first carrier frequency and the second carrier frequency being spaced apart by a predetermined frequency difference; and
,the receiver includes scanning circuitry for scanning across a predetermined frequency range to detect carrier signals separated by the predetermined frequency difference, a demodulator for retrieving a first retrieved modulating signal about the first carrier signal, means for comparing the first retrieved modulating signal to a series of acceptable stored traffic messages and for determining whether the first retrieved modulating signal matches one of the acceptable stored traffic messages, and means for announcing a message regarding the traffic situation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A traffic information warning system for conveying a message regarding a traffic situation from a traffic advisory site to a vehicle, the system comprising a transmitter adapted for placement at the advisory site and a receiver adapted for placement at the vehicle, wherein:
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the transmitter includes a first oscillator for transmitting a first carrier signal and a second oscillator for transmitting a second carrier signal, the first carrier signal having a first predetermined carrier frequency and the second carrier signal having a second predetermined carrier frequency, a modulator for modulating both carrier signals with an identical modulating signal reflective of a traffic situation; and
,the receiver includes a demodulator for retrieving a first retrieved modulating signal about the first carrier signal at the first predetermined carrier frequency, means for comparing the first retrieved modulating signal to a series of acceptable stored traffic messages and for determining whether the first retrieved modulating signal matches one of the acceptable stored traffic messages, and means for announcing a message regarding the traffic situation. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A traffic information warning system for conveying a message regarding a traffic situation from a traffic advisory site to a vehicle, the system comprising a transmitter adapted for placement at the advisory site and a receiver adapted for placement at the vehicle, wherein:
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the transmitter includes a first oscillator for transmitting a first carrier signal and a second oscillator for transmitting a second carrier signal, the first carrier signal having a first carrier frequency and the second carrier signal having a second carrier frequency, a modulator for modulating both carrier signals with an identical modulating signal reflective of a traffic situation, the first carrier frequency and the second carrier frequency being spaced apart by a predetermined frequency difference; and
,the receiver includes scanning circuitry for scanning across a predetermined frequency range to detect carrier signals separated by the predetermined frequency difference, 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, means for comparing the first retrieved modulating signal to the second retrieved modulating signal and determining whether the first and second retrieved modulating signal are identical, and means for announcing a message regarding the traffic situation. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49)
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50. A traffic information warning system for conveying first and second messages regarding a traffic situation from a traffic advisory site to a vehicle, the system comprising a transmitter adapted for placement at the advisory site and a receiver adapted for placement at the vehicle, wherein:
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the transmitter includes a first oscillator for transmitting a first carrier signal and a second oscillator for transmitting a second carrier signal, the first carrier signal having a first discrete carrier frequency and the second carrier signal having a second discrete carrier frequency, the first and second discrete carrier signal frequencies being located at a frequency location and the first message of a traffic situation being reflective of the specific frequency locations of the first and second discrete frequencies, a modulator for modulating both carrier signals with an identical modulating signal reflective of the second message regarding a traffic situation; and
,the receiver includes scanning circuitry for scanning across a predetermined frequency range to detect first and second carrier signals, means responsive to the detecting means for determining the first message regarding a traffic situation, 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, means for comparing the first retrieved modulating signal to the second retrieved modulating signal and determining whether the first and second retrieved modulating signal are identical, and means for announcing the first and second messages regarding the traffic situation. - View Dependent Claims (51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62)
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Specification