Cobra Electronics Corporation

David C Oliva

Max W Rogers

Phillip Thistlethwaite

Audio video interface

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.

Traffic information warning system with single modulated carrier

An electromagnetic signal detector with a means for detecting a first electromagnetic signal within a plurality of bands of frequencies, generating an alarm signal in response, and reinitiating an alarm signal for a second subsequent signal in one of said band of frequencies different from said first electromagnetic signal detection, is provided. The alarm signal response can be muted. The audible alarm signal reinitiates at any point in an alarm signal generation, even during muting, if a second subsequent electromagnetic signal of a different frequency band is detected.

Electromagnetic signal detector with mute feature

A noiseless radar detector with a dielectric resonator to suppress stray electromagnetic radiation generated by a local oscillator within the radar detector is disclosed. The dielectric resonator acts as an RF microwave absorber/attenuator if the resonant frequency of the dielectric resonator corresponds to the frequency of the interference from the local oscillator.

Noiseless radar detector

A combined motion detector/transmitter device for a traffic information warning system is disclosed. The device includes first and second oscillators for transmitting first and second carrier signals, respectively. The first carrier signal has a first carrier signal frequency and the second carrier signal has a second carrier signal frequency. The carrier signals are used to transmit a message regarding a traffic situation based upon either the magnitude of the frequency difference between the first and second carrier signal frequencies or the specific frequency locations of the carrier signals. The first and second oscillators also set up first and second disturbance fields, respectively. A first reflected signal receiver is associated with the first oscillator and receives a first reflected signal when a target is within the first disturbance field. A second reflected signal receiver is associated with the second oscillator and receives a second reflected signal when a target is within the second disturbance field. First and second detector circuits are provided for detecting the presence or absence of a moving target in the first and second disturbance fields, respectively. Finally, the device includes an indicator for indicating the detected presence of a moving target in either the first or second disturbance fields.

Combined motion detector/transmitter for a traffic information warning

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.

Traffic information warning system

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 unmodulated carrier signal at a first frequency and a second oscillator for transmitting a second unmodulated carrier signal at a second frequency. The first and second frequencies define the traffic information. The receiver includes a detector for detecting the first and second signals and an announcing device for announcing the traffic information.

Growing community of inventors

Chicago, IL, United States of America

David C Oliva