Crosstalk Cancellation via Dynamic Gain Filtering
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Solution Overview
Problem
Cross-talk leakage occurs in mobile communications devices due to hardware design artifacts and discrepant device standards, leading to poor phone call quality.
Innovation Solution
A method and system for crosstalk cancellation involving the reception of near-end and far-end acoustic signals, where the far-end signal is delayed and filtered using predetermined coefficients, and a gain is applied to produce a cross-talk estimate signal, which is then subtracted from the near-end signal to generate a cleaned acoustic signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a common ground is shared by various components within the cellular phone to minimize wires, then the amount of wires is reduced, but cross-talk leakage occurs that degrades phone call quality
Solution Approach 1:
The patent segments the common ground into multiple separate ground paths, assigning different ground references to different functional blocks (headphone jack, microphone, receiver). This segmentation eliminates the cross-talk caused by the shared common ground while maintaining wiring efficiency through systematic ground distribution.
Solution Approach 2:
The patent introduces an intermediary ground isolation mechanism that mediates between the headphone jack and the microphone/receiver components. This intermediary structure prevents direct electrical coupling between the far-end signal path and near-end signal path, thereby eliminating cross-talk leakage while maintaining system connectivity.
2Adaptability or versatility
If different hardware and manufacturing standards are used for various parts of the cellular phone, then device compatibility is improved, but cross-talk leakage occurs due to grounding standard discrepancies
Solution Approach 1:
The patent applies local quality by implementing region-specific ground references tailored to different hardware components and their manufacturing standards. Each functional block (headphone jack, microphone, receiver) has its own optimized ground configuration that accommodates local hardware requirements while preventing cross-talk through proper electrical isolation.
Data Source
AI summary
Crosstalk reduction and/or cancellation systems and methods are provided herein. In exemplary embodiments, a far-end acoustic signal may be delayed by M samples. Additionally, a crosstalk estimate value for the delayed far-end acoustic signal may be subtracted from an input acoustic signal. The crosstalk estimate value is a scaled version of filter outputs generated by a finite impulse response filter that utilizes predetermined filter coefficients. The filter outputs are scaled using a dynamic gain value.