Analog Echo Cancellation Circuit Rapid Parameter Adjustment
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Solution Overview
Problem
Communication devices face challenges in rapidly adjusting parameters of analog echo cancellation circuits, leading to echo interference and packet loss during multimedia streaming due to near-end and far-end echo interference in Ethernet communication systems.
Innovation Solution
A communication apparatus and method that involves transmitting a training sequence to adjust resistance and capacitance in an analog echo cancellation circuit using a control unit and ADC, optimizing signal-to-noise ratio (SNR) before receiving a second training sequence, allowing for rapid parameter setting and reducing echo interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the communication device uses analog circuit or digital circuit for echo cancellation, then echo interference is reduced, but the parameter setting time is excessive causing packet loss
Solution Approach 1:
The patent applies preliminary action by performing echo cancellation parameter adjustment during the first training sequence transmission period. The control unit receives the first training sequence and adjusts the analog echo cancellation circuit parameters before the actual data transmission begins, ensuring echo cancellation is ready in advance and avoiding packet loss during operational phase
Solution Approach 2:
The patent implements rushing through by compressing the parameter adjustment process into the training sequence period. The control unit rapidly adjusts resistance and capacitance values during the calibration phase (first training sequence), skipping the time-consuming iterative adjustment that would otherwise occur during actual communication, thus reducing overall setup time without sacrificing cancellation effectiveness
2Measurement precision
If the communication device adjusts resistance and capacitance in analog echo cancellation circuit, then signal-to-noise ratio is improved, but the adjustment speed is insufficient leading to echo interference
Solution Approach 1:
The control unit performs resistance and capacitance adjustment during the first training sequence reception, preparing the analog echo cancellation circuit in advance. This preliminary adjustment ensures optimal signal-to-noise ratio is achieved before actual data transmission, preventing echo interference during operational phase
Solution Approach 2:
The patent directly changes physical parameters (resistance and capacitance values) of the analog echo cancellation circuit based on the received first training sequence. By adjusting these parameters during the calibration period and using them for subsequent cancellation operations, the system achieves both high adjustment speed and optimal signal-to-noise ratio
Data Source
AI summary
A communication apparatus is disclosed including: an analog-front-end circuit for receiving and processing an analog input signal; an analog-to-digital converter (ADC) coupled with the analog-front-end circuit for converting processed signal from the analog-front-end circuit into a digital input signal; and a control unit coupled with the ADC for adjusting at least one resistance and/or at least one capacitance in an analog echo cancellation circuit according to the digital input signal before the analog-front-end circuit receives a training sequence that is the first training sequence transmitted from a second communication apparatus after the second communication apparatus begins communicating with the communication apparatus.