Echo Canceller Balance Impedance Selection Without Line Knowledge
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Solution Overview
Problem
Conventional echo canceller systems face challenges in adjusting the analog echo canceller without prior knowledge of impedance characteristics, leading to inadequate echo cancellation and undesirable communication quality, especially in full-duplex telecommunications with large delays.
Innovation Solution
An improved echo canceller system with a controller that selects a balance impedance using a selection algorithm based on transfer functions, allowing the digital echo canceller to effectively remove echo energy by matching the characteristics of the first voltage divider with a new second voltage divider value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional echo canceller systems are used without prior knowledge of impedance characteristics, then the system can operate without additional measurements, but echo cancellation is inadequate and communication quality deteriorates
Solution Approach 1:
The system uses feedback from the digital echo canceller's tap values to automatically adjust the analog echo canceller's voltage divider settings. The controller continuously monitors the digital echo canceller performance and feeds this information back to optimize the analog component, achieving reliable echo cancellation without requiring prior impedance measurements from the communication line.
Solution Approach 2:
The echo canceller system performs self-adjustment by using its own operational data (digital echo canceller tap values) to optimize its analog components. The controller automatically selects appropriate voltage divider settings based on real-time performance metrics, enabling the system to self-optimize without external intervention or prior impedance knowledge.
2Productivity
If the analog echo canceller is adjusted without prior impedance knowledge, then the system can be deployed quickly, but echo cancellation performance is insufficient
Solution Approach 1:
The system performs preliminary configuration by pre-establishing the analog echo canceller with initial voltage divider settings that can operate across a range of impedance conditions. The controller then refines these settings during operation using feedback from the digital echo canceller, allowing quick deployment followed by automatic optimization.
Solution Approach 2:
The system transitions from static initial voltage divider settings to dynamic adaptive adjustment. The controller continuously modifies the analog echo canceller parameters based on real-time feedback from the digital echo canceller's tap values, enabling the system to adapt to actual line conditions after deployment.
3Adaptability or versatility
If multiple voltage divider settings are available for selection, then echo cancellation can be optimized for different conditions, but device complexity increases
Solution Approach 1:
The controller acts as an intermediary that manages the complexity of multiple voltage divider settings. Instead of requiring manual configuration or complex hardware switching mechanisms, the controller automatically selects appropriate voltage divider settings based on feedback from the digital echo canceller, simplifying the overall system while maintaining adaptability.
Data Source
AI summary
An echo canceller system includes a first echo canceller having a first voltage divider and an adaptable second voltage divider that is configured to generate a first replica of an echo. A second echo canceller is configured to generate a second replica of an echo and has tap values that are generated in response to an error signal. A controller is coupled to the first and second echo cancellers and includes a selection algorithm that responds to the tap values of the second echo canceller and selects a voltage divider value for the adaptable second voltage divider.