PROBLEM TO BE SOLVED: To provide an active type noise reduction device and an active type noise reduction method by which a control object sound can be effectively reduced even if an engine speed is rapidly changed.SOLUTION: An active type noise reduction device comprises: plural adaptive filters corresponding to plural order components; and an adaptive filter part which has an addition part which synthesizes order components outputted from the plural adaptive filters and generates a control signal based on a reference signal. The plural adaptive filters respectively has: a control signal generating part which multiplies a filter factor to the order components of the reference signal and generates the order components of the control signal; a filter factor renewal part which updates the filter factor; and a step size setting part which sets a parameter for controlling an update amount of the filter factor. The step size setting part sets a parameter for an order component based on frequency variation of each order component in the reference signal.SELECTED DRAWING: Figure 2
【課題】エンジン回転数が急激に変化する場合にも制御対象音を効果的に低減できる能動型騒音低減装置及び能動型騒音低減方法を提供する。【解決手段】能動型騒音低減装置は、複数の次数成分に対応する複数の適応フィルターと、複数の適応フィルターから出力される次数成分を合成して制御信号を生成する加算部を有し、基準信号に基づいて制御信号を生成する適応フィルター部を備える。複数の適応フィルターは、それぞれ、基準信号の当該次数成分にフィルター係数を乗算して、制御信号の当該次数成分を生成する制御信号生成部と、フィルター係数を更新するフィルター係数更新部と、フィルター係数の更新量を制御するパラメーターを設定するステップサイズ設定部を有する。ステップサイズ設定部は、基準信号における次数成分ごとの周波数変動に基づいて、当該次数成分用のパラメーターを設定する。【選択図】図2
ACTIVE TYPE NOISE REDUCTION DEVICE AND ACTIVE TYPE NOISE REDUCTION METHOD
能動型騒音低減装置及び能動型騒音低減方法
2017-11-02
Patent
Electronic Resource
Japanese
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