The invention provides an active noise control device. An active noise control device (10) generates a control signal for controlling a speaker (16) by performing signal processing on a reference signal corresponding to a frequency (f) to be controlled by a control filter (W), which is an adaptive notch filter, and successively adaptively updates coefficients (W0, W1) of the control filter (W). The amplitude of the primary path filter (H) and the amplitude of the control filter (W) are compared to determine whether or not the state of the control filter (W) is unstable. Accordingly, even if the transmission characteristics change, noise can be reduced.
本发明提供一种有源噪声控制装置。有源噪声控制装置(10)通过作为自适应陷波滤波器的控制滤波器(W)对与控制对象频率(f)对应的基准信号进行信号处理,来生成控制扬声器(16)的控制信号,并逐次自适应更新控制滤波器(W)的系数(W0、W1),将初级路径滤波器(H^)的幅度与控制滤波器(W)的幅度进行比较,来判定控制滤波器(W)的状态是否不稳定。据此,即使传递特性发生变化也能够降低噪声。
Active noise control device
有源噪声控制装置
2022-07-29
Patent
Electronic Resource
Chinese
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