Vehicle Radio Interference Sensor Device for Noise Cancellation
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Solution Overview
Problem
Automobile radios experience interference from electromagnetic fields generated by car components, such as spark plug wires and the alternator, which degrade radio signal reception quality or prevent reception altogether.
Innovation Solution
A noise cancellation system using a noise sensor with conductive plates and a sensor coil, coupled to a noise reduction circuit, amplifies and processes interference signals to produce a correlated signal that can be subtracted from the antenna signal, reducing electromagnetic interference and improving radio reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electromagnetic components (spark plug wires, alternator) are used in the automobile, then the charging and ignition systems function properly, but electromagnetic interference is generated that disrupts radio reception
Solution Approach 1:
The patent extracts the harmful electromagnetic interference from the radio reception system by introducing a separate noise sensor that detects interference signals from sources like spark plug wires and alternators. The extracted interference signal is then processed and subtracted from the received radio signal, effectively removing the harmful component while preserving the useful broadcast signal.
Solution Approach 2:
The patent introduces an intermediary noise sensor and signal processing system that mediates between the electromagnetic interference sources and the radio reception system. This intermediary component detects the interference, processes it through correlation computation, and generates a cancellation signal that neutralizes the harmful electromagnetic effects without disrupting the normal operation of the ignition and charging systems.
2Reliability
If noise cancellation processing is applied to the radio signal, then radio reception quality improves, but system complexity increases due to additional sensors and processing circuits
Solution Approach 1:
The patent merges the noise cancellation functionality with the existing radio reception system by integrating the noise sensor output with the antenna signal through a correlation computation unit. The interference cancellation process is combined with the signal reception process, allowing both functions to operate simultaneously within a unified system architecture that shares common components and processing pathways.
Solution Approach 2:
The system performs self-service by automatically detecting and canceling its own interference without requiring external intervention. The noise sensor continuously monitors the electromagnetic environment, the correlation computation unit automatically processes the interference patterns, and the system dynamically adjusts the cancellation signal to maintain optimal reception quality throughout operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively minimizes electromagnetic interference, enhancing radio signal quality and reliability by isolating and canceling noise from the broadcast signal, thereby improving the overall reception experience.
Implementation Method 1
a sensor coil which is energized by the electromagnetic field captured by the first conductive plate and the second conductive plate as well as the radio interference captured directly
Data Source
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AI summary
An interference sensor device is disclosed. The interference sensor device includes a first conductive plate, a second conductive plate aligned parallel to the first conductive plate, a non-conductive matter between the first conductive plate and the second conductive plate wherein the first conductive plate is coupled to a first input of a first amplifier and the second conductive plate is coupled to a second input of the first amplifier, wherein an output of the first amplifier is coupled to a first of the two input ports or the signal adder. The interference sensor also includes a sensor coil having two ports each electrically coupled to a first input and a second input of a second amplifier, wherein an output of the second amplifier is coupled to a second of the two input ports of the signal adder.