To provide an active noise reduction device capable of suppressing a canceling sound from becoming a strange noise.SOLUTION: An active noise reduction device 10 comprises: a first adaptive filter unit 15; a first filter coefficient updating unit 17; and a control unit 19 which determines whether first noise control based on a first canceling sound N1 is in a stable condition or an unstable condition, on the basis of a first parameter relevant to the first adaptive filter unit 15. The control unit 19, when the first filter coefficient updating unit 17 is in a normal condition and updating the coefficient of the first adaptive filter, if determining that the first noise control is in the unstable condition, sets the first filter coefficient updating unit 17 in a restricted condition in which the effect of reducing a first noise is weakened than the normal condition. The control unit, when the first filter coefficient updating unit 17 is in the restricted condition, if determining that the first noise control is in the stable condition, returns the first filter coefficient updating unit 17 to the normal condition.SELECTED DRAWING: Figure 2

    【課題】キャンセル音が異音となってしまうことを抑制す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、第一適応フィルタ部15と、第一フィルタ係数更新部17と、第一適応フィルタ部15に関連する第一パラメータに基づいて、第一キャンセル音N1に基づく第一の騒音制御が安定状態であるか不安定状態であるかを判定する制御部19とを備える。制御部19は、第一フィルタ係数更新部17が通常状態で第一適応フィルタの係数を更新しているときに、第一の騒音制御が不安定状態であると判定すると、第一フィルタ係数更新部17を、通常状態よりも第一騒音を低減する効果が弱まる制限状態にし、第一フィルタ係数更新部17が制限状態であるときに、第一の騒音制御が安定状態であると判定すると、第一フィルタ係数更新部17を通常状態に復帰させる。【選択図】図2


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    Title :

    ACTIVE NOISE REDUCTION DEVICE, MOBILE 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 :

    2022-07-25


    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 / G10K Tonerzeugungsvorrichtungen , SOUND-PRODUCING DEVICES



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