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A relative path based virtual sensing method for the active feedback headrest system
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DOI：10.1016/j.ymssp.2024.111497.png)
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Virtual sensing methods (VS) enable an active noise control (ANC) system to achieve noise reduction at a target control point, but impractical to place an error microphone for an extended period of time. This is realized by employing remote monitoring microphones. This paper introduces the relative path based VS (RP-VS) method for feedback ANC systems and compares it to existing VS methods, including the auxiliary filter based VS (AF-VS) method and the remote microphone based VS (RM-VS) method. Theoretical analysis is conducted to describe the impact of acoustic path changes on their noise reduction capabilities. When acoustic paths remain constant, all three VS methods perform similarly. However, they behave differently when acoustic paths change: the RP-VS method aligns with the AF-VS method, while the RMVS method matches the performance of the fixed-coefficient (FC) filter. Moreover, changes in the primary noise characteristics can be treated equivalently as changes in the secondary paths at a single frequency, but these equivalent changes are inherently uncertain. Simulations and experiments conducted on an active headrest hence demonstrate the robustness of the RP-VS method against changing paths and primary noise characteristics.
Keyword:
Active noise control
Active headrest
Feedback control
Virtual sensing
Relative path
期刊
IF:
8.9
论文数:
1.3W
被引数:
6.6W
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