To provide an active noise reduction device reducing a period of time until an effect of reducing noise by a cancel sound can be acquired.SOLUTION: An active noise reduction device 10 includes: an adaptive filter part 15 generating a cancel signal used for outputting a cancel sound N1 for reducing noise N0 by applying an adaptive filter to a reference signal having correlation with the noise N0 in a space 56 in a vehicle 50; and a filter coefficient updating part 17 calculating a coefficient W of the adaptive filter on the basis of a predetermined update formula. The filter coefficient updating part 17 uses a first coefficient which is the coefficient W of the adaptive filter calculated by the filter coefficient updating part 17 at a second timing before the first timing, at the first timing when the cancel sound N1 is started to be output.SELECTED DRAWING: Figure 2

    【課題】キャンセル音により騒音を低減する効果が得られるようになるまでの時間の短縮を図ることができる能動騒音低減装置を提供する。【解決手段】能動騒音低減装置10は、車両50内の空間56における騒音N0と相関を有する参照信号に適応フィルタを適用することにより、騒音N0を低減するためのキャンセル音N1の出力に用いられるキャンセル信号を生成する適応フィルタ部15と、所定の更新式に基づいて適応フィルタの係数Wを算出するフィルタ係数更新部17とを備える。フィルタ係数更新部17は、キャンセル音N1の出力が開始される第一タイミングにおいて、フィルタ係数更新部17が第一タイミングよりも前の第二タイミングに算出した適応フィルタの係数Wである第一係数を更新式の初期値として使用する。【選択図】図2


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    Title :

    ACTIVE NOISE REDUCTION DEVICE, MOBILE BODY DEVICE AND ACTIVE NOISE REDUCTION METHOD


    Additional title:

    能動騒音低減装置、移動体装置、及び、能動騒音低減方法


    Contributors:

    Publication date :

    2022-07-27


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B60R Fahrzeuge, Fahrzeugausstattung oder Fahrzeugteile, soweit nicht anderweitig vorgesehen , VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR



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