Adaptive ANC Gain Adjustment for Movement-Induced Vibration
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Solution Overview
Problem
Active noise cancellation (ANC) systems in headsets can amplify low-frequency vibrations caused by user movements such as walking or running, leading to discomfort.
Innovation Solution
The headset detects vibrations or movements and adjusts the ANC system by reducing overall gain, disabling specific paths, or changing filter parameters to prevent amplification of low-frequency noise, ensuring comfortable listening during user movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ANC system maintains high gain for noise cancellation, then noise cancellation effectiveness is improved, but low-frequency vibrations from user movement are amplified causing discomfort
Solution Approach 1:
The ANC system dynamically adjusts its gain and filtering characteristics based on detected motion conditions. When user movement is detected through sensors (accelerometers, gyroscopes), the system modifies ANC parameters in real-time to prevent amplification of low-frequency vibrations while maintaining noise cancellation effectiveness for stationary noise sources.
Solution Approach 2:
The system changes ANC parameters (gain, filter cutoff frequencies, feedback/feedforward path activation) based on detected motion states. By adjusting these parameters dynamically, the system prevents amplification of movement-induced low-frequency vibrations while preserving noise cancellation performance for environmental noise.
2Object-affected harmful factors
If ANC system reduces gain to prevent vibration amplification, then user comfort during movement is improved, but noise cancellation effectiveness is reduced
Solution Approach 1:
The ANC system segments the audio frequency spectrum and applies different processing to different frequency ranges. Low-frequency components associated with user movement are filtered or gain-reduced, while mid and high-frequency noise cancellation remains effective. This segmentation allows selective suppression of harmful vibrations while preserving beneficial noise cancellation.
Solution Approach 2:
The system applies different ANC processing qualities to different frequency bands and spatial conditions. For low frequencies during movement, aggressive filtering and gain reduction are applied locally. For other frequencies and stationary conditions, full ANC effectiveness is maintained. This localized quality adjustment resolves the contradiction between comfort and effectiveness.
3Adaptability or versatility
If ANC system rapidly adjusts parameters in response to movement, then adaptability to movement conditions is improved, but sudden parameter changes may disrupt user experience
Solution Approach 1:
The system implements periodic or gradual parameter transitions rather than instantaneous changes. When movement detection triggers ANC parameter adjustments, the changes are applied over a short time period or through stepped adjustments, preventing sudden disruptions to the user experience while maintaining adaptability to movement conditions.
Solution Approach 2:
The system prepares for potential parameter changes by implementing smooth transition mechanisms in advance. Buffering and ramping functions are built into the parameter adjustment logic to cushion sudden changes, ensuring that adaptability to movement does not come at the cost of user experience disruption.
Data Source
AI summary
A speaker system includes a speaker, a processor, and an active noise cancellation (ANC) circuit communicatively coupled with the processor. The ANC is configured to apply ANC on audio signals from outside the speaker system to generate a modified audio signal stream through the speaker. The application of ANC is to include generation of ANC signals to interfere with at least part of the audio signals from outside the speaker system in the modified audio signal stream. The processor is configured to determine of low-frequency energy at the speaker system, the low-frequency energy below a threshold frequency. The ANC circuit is configured to, based on the determination of low-frequency energy at the speaker system, perform a corrective action on application of ANC to the audio signals from outside the speaker system.