PROBLEM TO BE SOLVED: To provide "an active noise control device and an error path characteristic model correction method" capable of correcting an error path characteristic model used in a filtered-x LMS algorithm with a simpler structure, without giving an uncomfortable feeling.SOLUTION: An error path characteristic model correction control unit 12 determines the deviation of a phase of an actual transfer function C from an error path characteristic model, based on: a cross correlation between an error signal e outputted from a microphone 8 and a signal in which the error path characteristic model 9 is applied to a noise cancellation sound X to be output; and a cross correlation between the error signal e and a signal in which a transfer function having a phase characteristic deviating by +90 degrees from the phase characteristic of the error path characteristic model is applied to the noise cancellation sound X. The error path characteristic model correction control unit then corrects the error path characteristic model so that the determined deviation is reduced (to ±90 degrees or less).SELECTED DRAWING: Figure 1
【課題】簡易な構成において不快感を与えることなくFiltered-x LMSアルゴリズムが用いる誤差経路特性モデルを補正できる「能動型騒音制御装置及び誤差経路特性モデル補正方法」を提供する。【解決手段】誤差経路特性モデル補正制御部12は、誤差経路特性モデル9を、出力する騒音キャンセル音Xに施した信号と、マイクロフォン8から出力される誤差信号eとの相関値と、誤差経路特性モデルの位相特性を+90度ずらした伝達関数を、騒音キャンセル音Xに施した信号と誤差信号eとの相関値とに基づいて、誤差経路特性モデルに対する実際の伝達関数Cの位相のずれを判定し、判定したずれが低減する(±90度以内になるよ)ように誤差経路特性モデルを補正する。【選択図】図1
ACTIVE NOISE CONTROL DEVICE AND ERROR PATH CHARACTERISTIC MODEL CORRECTION METHOD
能動型騒音制御装置及び誤差経路特性モデル補正方法
2018-11-15
Patent
Elektronische Ressource
Japanisch
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