Noise Reduction Device Phase Difference Absorption Circuit
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Solution Overview
Problem
Existing noise reduction devices require complex calculation processing and significant resources to minimize noise components, complicating their configuration and real-time operation.
Innovation Solution
A noise reduction device with a phase difference absorption circuit and a combiner that shifts and combines signals from two antennas to achieve almost opposite phases, reducing noise without feedback control and simplifying the configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If feedback control with variable amplifier and variable phase shifter is used to minimize output power, then noise reduction effectiveness is improved, but device complexity and calculation resources increase
Solution Approach 1:
The patent extracts and eliminates the complex feedback control mechanism (variable amplifier and variable phase shifter) from the noise reduction system. Instead of using active feedback control to minimize output power, the invention uses a passive combiner structure with fixed phase relationships to achieve noise cancellation, thereby removing the source of complexity while maintaining noise reduction functionality
Solution Approach 2:
The combiner is designed to automatically combine signals from multiple antennas in opposite phases without requiring external feedback control. The system self-adjusts to minimize noise by utilizing the inherent phase characteristics of the combiner structure, eliminating the need for complex calculation processing and feedback mechanisms
2Object-affected harmful factors
If feedback control with complicated calculation processing is used, then noise minimization is achieved, but real-time operation capability deteriorates due to large calculation resources required
Solution Approach 1:
The patent replaces the computational feedback control system (mechanical/electronic calculation processing) with a passive electromagnetic field combination system. The combiner uses fixed phase relationships and signal superposition principles to achieve noise cancellation without requiring real-time calculation processing, thereby enabling real-time operation with minimal computational resources
3Object-affected harmful factors
If variable amplifier and variable phase shifter are used for feedback control, then noise cancellation effectiveness is improved, but configuration simplicity deteriorates
Solution Approach 1:
The patent removes the variable amplifier and variable phase shifter components from the noise reduction configuration. By extracting these complex active components and replacing them with a passive combiner structure, the system achieves noise cancellation with a simpler, more manufacturable configuration that requires fewer adjustable parameters and components
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
The device effectively reduces noise by making the phase difference between signals constant across the frequency band, allowing for noise cancellation with a simpler configuration and reduced calculation load.
Implementation Method 1
a phase difference absorption circuit provided between the first antenna and the combiner or between the second antenna and the combiner. The phase difference absorption circuit has a phase shift characteristic that reduces a difference between a phase difference between two signals each having a lower limit frequency of a band of the broadcast wave and passing through the first propagation path and the second propagation path and a phase difference between two signals each having an upper limit frequency of the band of the broadcast wave and passing through the first propagation path and the second propagation path
Implementation Method 2
a combiner to shift a phase of one of a first signal propagating through a first propagation path and a second signal propagating through a second propagation path by a predetermined angle and combine the phase-shifted one signal of the first signal and the second signal with the other signal of the first signal and the second signal
Implementation Method 3
combining the first signal and the second signal having almost opposite phases by the combiner, noises caused by the noise sources can be canceled out
Data Source
AI summary
A noise reduction device includes: a combiner to shift a phase of one of a first signal propagating through a first propagation path and a second signal propagating through a second propagation path by a predetermined angle and combine the phase-shifted one signal of the first signal and the second signal with the other signal of the first signal and the second signal; and a phase difference absorption circuit having a phase shift characteristic that reduces a difference between a phase difference between two signals each having a lower limit frequency of a band of the broadcast wave and passing through the first propagation path and the second propagation path and a phase difference between two signals each having an upper limit frequency of the band of the broadcast wave and passing through the first propagation path and the second propagation path.