To provide an active noise reduction device capable of improving noise reduction performance.SOLUTION: An active noise reduction device 10 comprises: a reference signal generation unit 12 which generates a first reference signal having a first frequency corresponding to the rotating speed of an engine 54; an adaptive filter 13 which outputs a cancel signal used to output a cancel sound by applying a filter coefficient, updated sequentially on the basis of an error signal output from a microphone 53, to the first reference signal; and a frequency control unit 11 which causes the reference signal generation unit 12 to generate a second reference signal having a second frequency obtained by correcting the first frequency when it is determined that the quantity of variation in rotating speed of the engine 54 exceeds a predetermined value so as to cause the adaptive filter 13 to output the cancel signal based upon the second reference signal.SELECTED DRAWING: Figure 6
【課題】騒音低減性能の向上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、エンジン54の回転数に対応する第1周波数を有する第1基準信号を生成する基準信号生成部12と、マイクロフォン53から出力される誤差信号に基づいて逐次更新されるフィルタ係数を第1基準信号に適用することによりキャンセル音の出力に用いられるキャンセル信号を出力する適応フィルタ13と、エンジン54の回転数の変動量が所定値を超えると判定したときに、基準信号生成部12に第1周波数を補正した第2周波数を有する第2基準信号を生成させることで、適応フィルタ13から第2基準信号に基づくキャンセル信号を出力させる周波数制御部11とを備える。【選択図】図6
ACTIVE NOISE REDUCTION DEVICE, MOBILE DEVICE AND ACTIVE NOISE REDUCTION METHOD
能動騒音低減装置、移動体装置、及び、能動騒音低減方法
2024-11-28
Patent
Electronic Resource
Japanese
ACTIVE NOISE REDUCTION DEVICE, MOBILE DEVICE, AND ACTIVE NOISE REDUCTION METHOD
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