101 Active Noise Control following a Moving Evaluation Point in a Reverberant Room

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  • 101 室内残響音場における評価点の移動に追従する能動音響制御(音と流れ場の能動制御技術)
  • 室内残響音場における評価点の移動に追従する能動音響制御
  • シツナイ ザンキョウオンジョウ ニ オケル ヒョウカテン ノ イドウ ニ ツイジュウ スル ノウドウ オンキョウ セイギョ

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In a three-dimensional acoustic field, it is difficult to control sound in the whole room using the active noise control (ANC) technique. Instead, an around-head-control is investigated in this paper. It can reduce noise locally around the head with the simple equipment. However, there is a problem that the control effect during the movement is worse by the conventional adaptive algorithms. Against this problem, we propose a new method following movement of an evaluation point in a reverberant room. During the movement, the algorithm can control noise by interpolating the secondary path of the Filtered-x algorithm. In the algorithm, Common-Pole and Residue model is used for the interpolation, and the updating size appropriate to each coefficient of the adaptive filter is calculated by using a step size vector. The validity of the proposed method is shown by the numerical simulation and the experiment.

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