Echo Cancellation via Selective Signal Group Ignoring

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Solution Overview

Problem

Existing communication devices face challenges in efficiently canceling echo signals due to impedance mismatches in communication channels, which require significant computational resources for effective echo cancellation.

Innovation Solution

An echo cancellation device and method that selectively ignores certain delayed signal groups to generate an echo cancellation signal, reducing the number of calculations necessary for echo cancellation by leveraging sparse impulse responses based on communication channel lengths.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If all delayed signal groups are used to generate echo cancellation signal, then echo cancellation performance is improved, but computational complexity increases

Engineering Contradiction:

Improveecho cancellation performanceVSAvoidcomputational complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent segments the delayed signal groups into multiple subsets (first delayed signal group, second delayed signal group, etc.) and processes them separately. This segmentation allows the system to selectively ignore certain groups while still maintaining effective echo cancellation, thereby reducing computational complexity without completely sacrificing performance.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies partial action by selectively ignoring at least one delayed signal group instead of processing all delayed signal groups. This partial processing approach reduces the computational load while maintaining sufficient echo cancellation performance for practical applications.

Inventive Principle:

Principle #16Partial or excessive action

2Productivity

If selective ignoring of delayed signal groups is implemented, then computational load is reduced, but echo cancellation performance may deteriorate

Engineering Contradiction:

Improveprocessing efficiencyVSAvoidecho cancellation performance

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent dynamically determines which delayed signal groups to ignore based on system conditions and requirements. This dynamic approach allows the system to adaptively balance between computational efficiency and echo cancellation performance, optimizing the trade-off in real-time operation.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameter of signal group selection by selectively ignoring certain delayed signal groups. This parameter change enables the system to adjust computational load while maintaining acceptable echo cancellation performance through optimized signal processing.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS11855710B2Echo cancellation device and echo cancellation method thereof applied in communication device

Publication Date: 2023.12.26 FARADAY TECH CORP

AI summary

An echo cancellation device and an echo cancellation method thereof applied in a communication device are provided. The echo cancellation device includes an echo canceller and a combine circuit. The echo canceller obtains a plurality of delayed signals from a local signal of the communication device, and the delayed signals are divided into a plurality of delayed signal groups. The echo canceller selectively ignores at least one of the delayed signal groups, and the echo canceller generates an echo cancellation signal with the others of the delayed signal groups. The combine circuit is coupled to an interface circuit of the communication device to receive a received signal. The combine circuit cancels an echo component of the received signal with the echo cancellation signal to generate a cancelled signal.