Attenuation Effects of Discrete Tone Using Adaptive Feedback Active Noise Control

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  • 適応フィードバック能動騒音制御による離散周波数音の抑制
  • テキオウ フィードバック ノウドウ ソウオン セイギョ ニ ヨル リサン シュウハスウオン ノ ヨクセイ

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The attenuation characteristics of a slit resonator that combined the adaptive feedback ANC system at a ventilation aperture of the package for leakage noise is investigated. The discrete tones radiated from an AC axial flow fan are controlled by DSP using Filtered-X Least Mean Square algorithm. The attenuation is found at the range of: 3dB-14dB with circular slit resonator, 2dB-15dB with elliptic slit resonator. Results of measurement show that the proposed system can achieve TNR(Tone to Noise Ratio) and PR(Prominence Ratio) under threshold effectively.

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