To provide a non-closed type active noise control device that can effectively eliminate random noise such as road noise and is suitable for use in a vehicular cabin and the like.SOLUTION: An active noise control device detects noise, and delays the phase of a signal of the detected noise in a low-frequency band. Since in the non-closed type noise control device, a phenomenon in which the phase of the signal of noise in the low-frequency band advances occurs, correction of delaying the phase with correction means for compensation is performed. Then, noise is reduced by outputting a noise reduction sound on the basis of the signal of noise whose phase is corrected.SELECTED DRAWING: Figure 6
【課題】ロードノイズなどのランダムノイズを効果的に消音することができ、車室内などでの使用に適した非密閉型の能動型騒音制御装置を提供する。【解決手段】能動型騒音制御装置は、ノイズを検出し、検出されたノイズの信号の低周波帯域における位相を遅延させる。非密閉型の騒音制御装置では、低周波帯域におけるノイズの信号の位相が進む現象が起きるので、補正手段により位相を遅延させて相殺する補正を行う。そして、位相が補正されたノイズの信号に基づいて、ノイズ低減音を出力することにより、ノイズを低減する。【選択図】図6
ACTIVE NOISE CONTROL DEVICE
能動型騒音制御装置
2019-08-29
Patent
Electronic Resource
Japanese
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