Echo-Canceling Mixer Circuit With Adaptive Wheatstone Bridge
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Gigabit Ethernet full-duplex communication systems suffer from near-end echo noise due to non-ideal mixer circuits, leading to a degraded signal-to-noise ratio and potential errors, especially over longer distances.
Innovation Solution
A signal transceiving apparatus and method utilizing a Wheatstone bridge with adaptive variable loads and a control circuit to adjust impedances, reducing residual echo noise without affecting signal transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a mixer circuit is used for full-duplex communication, then data transmission bandwidth is greatly increased, but near-end echo noise interferes with the receiving signal
Solution Approach 1:
The patent introduces a Wheatstone bridge circuit as an intermediary component between the mixer circuit and the transmission/receiving paths. This bridge circuit, with its variable loads, acts as a mediator to balance and cancel the echo noise generated by the mixer circuit, allowing full-duplex operation without signal degradation
Solution Approach 2:
The patent dynamically adjusts the impedance parameters of the variable loads in the Wheatstone bridge circuit to match changing transmission line conditions. By changing these parameters in response to detected echo levels, the system maintains optimal echo cancellation across varying communication distances and conditions
2Length of stationary object
If communication distance increases, then coverage area is expanded, but echo noise interference becomes even severe
Solution Approach 1:
The patent implements a feedback mechanism where the receiving circuit detects echo noise levels and feeds this information back to the control circuit. The control circuit then adjusts the variable loads in the Wheatstone bridge to optimize echo cancellation, creating a closed-loop system that adapts to changing communication distances
Solution Approach 2:
The patent transforms the static impedance matching network into a dynamic system with variable loads that can be adjusted in real-time. This allows the echo cancellation mechanism to adapt to varying communication distances and line conditions, maintaining performance from short to long distance connections
3Object-affected harmful factors
If variable loads are added to the Wheatstone bridge for echo cancellation, then echo noise is reduced, but device complexity increases
Solution Approach 1:
The patent designs the Wheatstone bridge circuit to serve multiple functions: impedance matching, echo cancellation, and signal balancing. By making the variable loads serve multiple purposes, the patent reduces the need for separate dedicated echo cancellation components, thereby limiting the increase in overall device complexity
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 adaptive impedance adjustment significantly reduces residual echo noise in the receiving circuit, maintaining signal quality and integrity across longer distances.
Implementation Method 1
The mixer circuit includes a Wheatstone bridge that includes a first transformer winding circuit, and the mixer circuit further includes a second transformer winding circuit
Data Source
AI summary
The present invention discloses a signal transceiving apparatus having echo-canceling mechanism. A mixer circuit includes a Wheatstone bridge and a transformer winding circuit. The Wheatstone bridge includes another transformer winding circuit and a variable load and includes a first input terminal, a first output terminal, a second input terminal and a second output terminal located at each two neighboring arms in an order. A transmission circuit is coupled to the first input terminal and the second input terminal to perform signal transmission through the mixer circuit. A receiving circuit is coupled to the first output terminal and the second output terminal to perform signal receiving through the mixer circuit. A control circuit adjusts the impedance of the variable load when a residual echo noise amount does not satisfy a minimum echo noise amount condition, and stops to adjust the impedance when the residual echo noise amount satisfies the condition.