Active noise reduction control characteristics
By generating parameters for the ANR headset digital filter and adjusting the filter response to match the target gain, the problem of limited noise reduction performance caused by the instability of the ANR headset feedback loop is solved, achieving more efficient noise reduction and reduction of characteristic differences between users.
JP7648651B2Active Publication Date: 2025-03-18BOSE CORP
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Patent Information
- Application Number
- JP2022564448
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- Priority Date
- 2020-04-24
- Filing Date
- 2021-04-08
- Publication Date
- 2025-03-18
- Estimated Expiration
- 2041-04-08
AI Technical Summary
Technical Problem
Existing Active Noise Reduction (ANR) headphones have instability in stabilizing feedback loops, resulting in limited noise reduction performance.
Method used
By receiving the input signal from the ANR headset sensor, the frequency domain representation of the signal is calculated and parameters for the digital filter are generated according to the representation to adjust the filter response to ensure that the gain of the feedback loop is consistent with the target gain.
Benefits of technology
It realizes that while maintaining the stability of the feedback loop, it improves the noise reduction performance and reduces the difference in noise reduction characteristics between users.
✦ Generated by Eureka AI based on patent content.
Abstract
A first input signal captured by one or more sensors associated with the ANR headphones is received. A frequency-domain representation of the first input signal is calculated for a set of discrete frequencies based on which a set of parameters is generated for a digital filter disposed in an ANR signal transmission path of the ANR headphones, the set of parameters being such that a loop gain of the ANR signal transmission path substantially matches a target loop gain. Generating the set of parameters includes tuning a response of the digital filter with frequency (e.g., ranging from 200 Hz to 5 kHz). The responses of at least three second-order sections of the digital filter are tuned. A second input signal in the ANR signal transmission path is processed using the generated set of parameters to generate an output signal for driving an electro-acoustic transducer of the ANR headphones.
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