ANR Circuit Triple-Buffering for Instability Failsafe
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Solution Overview
Problem
Existing personal active noise reduction (ANR) devices face issues with high power consumption, limited frequency ranges for noise reduction, and the generation of unwanted noise, leading to short battery life and unpleasant sound experiences.
Innovation Solution
An ANR circuit employing triple buffers to configure settings dynamically, including a first and second buffer for synchronization and a third buffer for failsafe settings, to manage digital data flow and instability, incorporating ADCs, DACs, digital filters, and VGA components to optimize noise reduction while minimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dynamic configuration of ANR settings is implemented, then noise reduction effectiveness is improved, but device complexity increases
Solution Approach 1:
The patent divides the ANR settings configuration into separate buffer stages (first buffer for feedback-based ANR, second buffer for feedforward-based ANR, third buffer for failsafe settings). This segmentation allows independent configuration and management of different ANR modes, improving reliability while keeping each buffer's complexity manageable through modular design.
Solution Approach 2:
The patent implements preliminary configuration of ANR settings in buffers before actual noise reduction operation. The first and second buffers prepare configuration settings in advance, and the third buffer maintains failsafe settings ready for immediate deployment. This preliminary action ensures smooth transitions and prevents instability during dynamic reconfiguration.
2Stability of the object's composition
If triple buffering mechanism is employed for configuration synchronization, then system stability is improved, but memory requirements increase
Solution Approach 1:
The configuration memory is segmented into three distinct buffers, each serving a specific purpose: first buffer for feedback-based ANR configuration, second buffer for feedforward-based ANR configuration, and third buffer for failsafe settings. This segmentation allows stable configuration management with minimal overlap in memory usage patterns.
Solution Approach 2:
The patent implements feedback-based ANR configuration where the system monitors noise reduction effectiveness and adjusts settings accordingly. The first buffer stores configuration settings that are dynamically updated based on feedback from noise reduction performance, enabling stable operation through continuous optimization.
3Reliability
If failsafe buffer is added for instability detection, then system reliability is improved, but device complexity increases
Solution Approach 1:
The third buffer stores failsafe ANR settings in advance, ready to be deployed immediately when instability is detected in the feedback-based or feedforward-based ANR operation. This preliminary preparation of backup settings simplifies the reliability mechanism, as the system only needs to switch buffers rather than reconfigure everything from scratch.
Solution Approach 2:
The third buffer acts as an intermediary failsafe layer between the primary configuration buffers and the actual ANR operation. When instability is detected, the system can transition to the failsafe buffer without directly modifying the primary configuration, thereby managing complexity through a protective intermediary layer.
Data Source
AI summary
An ANR circuit employs first, second and third buffers to buffer ANR settings in preparation for configuring one or more components of the ANR circuit during operation and in synchronization with the transfer of at least one piece of digital data within the ANR circuit. The first and second buffers are alternately used to carry out such configuring, while the third buffer stores a “failsafe” ANR settings to be automatically used in configuring the one or more components of the ANR circuit in response to an indication of instability in the provision feedback-based ANR, feedforward-based ANR and/or pass-through audio being detected.