To provide an inexpensive active noise reduction system that can maintain control performance even if acoustic transmission characteristics change.SOLUTION: An active noise reduction system 11 includes: a plurality of noise microphones 13A-13E that generate a plurality of noise signals x on the basis of noise; and a controller 16 that controls canceling sound output devices 12A-12D on the basis of the plurality of noise signals x. The controller 16 selects a plurality of reference signals r' corresponding to noise and an error signal e corresponding to an error between the noise and canceling sound y from among the plurality of noise signals x, generates a control signal u from the plurality of reference signals r' using a plurality of control filters W, and adaptively updates the plurality of control filters W using a plurality of acoustic transmission characteristic filters C^A and C^B. The plurality of acoustic transmission characteristic filters C^A and C^B include an adaptive update filter C^B to be adaptively updated, and a non-adaptive update filter C^A to be updated on the basis of an update value of the adaptive update filter C^B.SELECTED DRAWING: Figure 2
【課題】音響伝達特性が変化しても制御性能を維持することができる安価な能動型騒音低減装置を提供する。【解決手段】能動型騒音低減装置11は、騒音に基づいて複数の騒音信号xを生成する複数の騒音マイク13A-13Eと、複数の騒音信号xに基づいて打消音出力装置12A-12Dを制御する制御装置16と、を備え、制御装置16は、複数の騒音信号xの中から、騒音に対応する複数の参照信号r´と、騒音と打消音yとの誤差に対応する誤差信号eと、を選択し、複数の制御フィルタWを用いて、複数の参照信号r´から制御信号uを生成し、複数の音響伝達特性フィルタC^A、C^Bを用いて、複数の制御フィルタWを適応的に更新し、複数の音響伝達特性フィルタC^A、C^Bは、適応的に更新される適応更新フィルタC^Bと、適応更新フィルタC^Bの更新値に基づいて更新される非適応更新フィルタC^Aと、を含む。【選択図】図2
ACTIVE NOISE REDUCTION SYSTEM AND ACTIVE NOISE REDUCTION PROGRAM
能動型騒音低減装置及び能動型騒音低減プログラム
11.10.2023
Patent
Elektronische Ressource
Japanisch
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