Communication Circuit Interference Elimination via Frequency Mixing
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Solution Overview
Problem
Existing communication devices require complex systems and additional components to detect and eliminate interference waves, making the process cumbersome.
Innovation Solution
A communication device with a communication circuit that includes an oscillator, dividers, mixers, and a filter circuit to switch and eliminate interference waves by generating and mixing frequency signals, allowing for interference wave elimination in a simple system without the need for additional tuning circuits or oscillators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a tuning circuit and oscillator are added to detect interference wave frequency, then interference wave elimination capability is improved, but device complexity increases
Solution Approach 1:
The patent merges the interference wave elimination function with the existing communication circuit components (mixers, dividers, oscillators already present for frequency conversion). The local oscillator signal used for down-conversion is also utilized to generate the elimination signal, combining multiple functions into existing hardware without adding separate detection circuits.
Solution Approach 2:
The local oscillator and mixer circuits serve dual purposes: they perform the necessary frequency down-conversion for signal reception and simultaneously generate the elimination signal for interference removal. The same hardware components are used for both signal processing and interference elimination, eliminating the need for dedicated interference detection hardware.
2Measurement precision
If additional tuning circuit and oscillator are provided for interference detection, then interference wave frequency detection accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The patent combines interference detection and elimination functions with the existing frequency conversion circuitry. The local oscillator and mixer components already required for signal reception are repurposed to generate elimination signals, eliminating the need for additional expensive components and simplifying manufacturing.
Solution Approach 2:
The communication circuit's own local oscillator and mixer components serve the dual purpose of signal down-conversion and interference signal generation. The system uses its existing resources to eliminate interference without requiring external or additional specialized components, reducing manufacturing complexity and cost.
3Reliability
If complex control is implemented for interference wave elimination, then interference elimination effectiveness is improved, but operational complexity increases
Solution Approach 1:
The patent combines the interference elimination control with the existing signal reception control. The same control signals that manage the mixers and oscillators for frequency down-conversion are also used to generate the elimination signals, unifying the control logic and eliminating the need for separate complex control mechanisms.
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
Enables efficient elimination of interference waves in a straightforward manner, reducing the complexity and cost of the system while maintaining effective signal processing.
Implementation Method 1
an oscillator that oscillates a first frequency signal according to the desired frequency signal
Implementation Method 2
a first divider that outputs a second frequency signal obtained by dividing the first frequency signal into two, a second divider that outputs a third frequency signal obtained by dividing the second frequency signal into two
Implementation Method 3
a first mixer that mixes the reception signal received through the antenna and the first frequency signal and outputs an intermediate frequency signal, a second mixer that mixes the intermediate frequency signal and the third frequency signal
Implementation Method 4
a filter circuit that eliminates a signal component of the frequency of an output signal from the third mixer from the reception signal
Data Source
AI summary
A communication device includes a communication circuit capable of switching a reception or a transmission of a desired frequency signal through an antenna. The circuit includes an oscillator that oscillates a first frequency signal according to the desired frequency signal at a receiving time, a first divider that outputs a second frequency signal obtained by dividing the first frequency signal into two, a second divider that outputs a third frequency signal obtained by dividing the second frequency signal into two, a first mixer that mixes the reception signal received through the antenna and the first frequency signal and outputs an intermediate frequency signal, a second mixer that mixes the intermediate frequency signal and the third frequency signal and outputs a baseband signal, a third mixer capable of mixing the output from the first divider and the output from the second divider, and a filter circuit that eliminates a signal component of the frequency of an output signal from the third mixer from the reception signal at the receiving time.