Parallel ANC Filter Circuit for Stable Noise Cancellation Fit
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Solution Overview
Problem
Existing active noise control (ANC) technologies face challenges in achieving stable performance across different wearing styles and user variations, with adaptive ANC techniques being complex and potentially unstable, while static ANC techniques are sensitive to individual differences.
Innovation Solution
A parallel ANC circuit design incorporating both static and adaptive filters, where static filters model consistent wearing conditions and adaptive filters adapt to individual variations, allowing for improved stability and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If adaptive ANC technique is used, then robustness to individuals and wearing styles is improved, but control difficulty and complexity increases
Solution Approach 1:
The ANC filter is segmented into multiple parallel filter branches, each handling specific frequency bands or noise characteristics. This segmentation allows independent optimization of each branch, reducing overall control complexity while maintaining adaptability across different users and wearing styles.
Solution Approach 2:
The parallel filter structure creates a universal ANC system that can adapt to multiple users and wearing conditions simultaneously. Each filter branch serves multiple functions by being optimized for different noise profiles, enabling the system to handle diverse individual variations without requiring separate control mechanisms.
2Ease of operation
If static ANC technique is used, then ease of design and control is improved, but sensitivity to individuals and wearing styles increases
Solution Approach 1:
The system transitions from purely static filter coefficients to a hybrid structure where filter branches can dynamically adjust their characteristics. This allows the system to maintain the simplicity of static ANC design while incorporating adaptive capabilities to accommodate different individuals and wearing styles through controlled variability in filter parameters.
3Adaptability or versatility
If adaptive ANC technique is used, then performance for poor fit is improved, but stability deteriorates
Solution Approach 1:
By segmenting the ANC filter into multiple parallel branches, the system can isolate unstable adaptive adjustments to specific branches while maintaining stability in others. Each branch handles specific frequency ranges or noise types, allowing localized adaptation without compromising overall system stability.
Solution Approach 2:
The system employs controlled parameter changes within the parallel filter structure, where filter coefficients are adjusted within constrained ranges to maintain stability. This allows the system to adapt to poor fits by modifying parameters within safe boundaries, preventing the instability that would result from unrestricted adaptive adjustments.
Data Source
AI summary
An active noise control (ANC) circuit is used for generating an anti-noise signal, and has a plurality of filters including at least one first filter and at least one second filter. The at least one first filter generates at least one first filter output, wherein each of the at least one first filter has at least one non-static filter and at least one static filter connected in a series fashion. The at least one second filter generates at least one second filter output, wherein each of the at least one second filter has at least one adaptive filter. The anti-noise signal is jointly controlled by the at least one first filter output and the at least one second filter output. The at least one first filter and the at least one second filter are connected in a parallel fashion.