PROBLEM TO BE SOLVED: To reduce residual abnormal sound when applying an active type noise reduction device to an in-cabin environment where audio signals are reproduced.SOLUTION: An active type noise reduction device includes a standard signal producing part, an adaptive filter part, a control sound output part, and an error signal detection part. An adaptive filter includes a reference signal producing part 303 producing a reference signal on the basis of a standard signal input into the adaptive filter, generates a control signal by multiplying the standard signal by a filter coefficient, updates the filter coefficient on the basis of the reference signal and an error signal so that the error signal becomes minimum, sets a step size parameter showing the update amount of the filter coefficient, and sets a step size adjustment factor for adjusting the step size parameter on the basis of an audio information feature amount and change of the control signal.SELECTED DRAWING: Figure 2
【課題】オーディオ信号が再生される車室内環境に能動型騒音低減装置を適用した場合に、残留異音を低減する。【解決手段】能動型騒音低減装置は、基準信号生成部と、適応フィルター部と、制御音出力部と、誤差信号検出部と、を備え、適応フィルターは、当該適応フィルターに入力される基準信号に基づいて参照信号を生成する参照信号生成部303と、基準信号にフィルター係数を乗算して、制御信号を生成し、参照信号と誤差信号とに基づいて、誤差信号が最小となるようにフィルター係数を更新し、フィルター係数の更新量を示すステップサイズパラメーターを設定し、オーディオ情報特徴量と、制御信号の変化とに基づいて、ステップサイズパラメーター調整するためのステップサイズ調整係数を設定する。【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
2018-10-04
Patent
Electronic Resource
Japanese
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