Abstract The feedforward hybrid active noise control (HANC) system combines the strengths of the narrowband ANC (NANC) system and the broadband ANC (BANC) system. Taking this advantage into account, this paper applies it to attenuate the vehicle interior noise mixed with narrowband and broadband components. However, in the HANC system, the NANC subsystem and BANC subsystem are fed a common error signal which depends on the combined secondary signals from the both subsystems. This causes the problem of mutual coupling and hence affects the noise reduction performance. To tackle the problem, we propose a modified HANC (MHANC) system in this paper. In the MHANC system, the error signal of each ANC subsystem is independently synthesized on the basis of the estimated primary and secondary signals. Note that the NANC system for engine order noise control suffers performance deterioration when the fluctuating real-time engine speed signal is used for constructing internal reference signals. For performance improvement, an enhanced NANC (ENANC) system is developed by smoothing the fluctuating engine speed signal. Meanwhile,the ENANC system is incorporated in the MHANC system to form an enhanced MHANC (EMHANC) system. Simulations were performed on the vehicle interior noise recorded under actual driving conditions. The corresponding results demonstrate the superiority of the proposed MHANC and EMHANC systems.

中文翻译：

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一种改进的车辆前馈混合主动噪声控制系统

摘要 前馈混合主动噪声控制（HANC）系统结合了窄带主动降噪（NANC）系统和宽带主动降噪（BANC）系统的优点。考虑到这一优势，本文将其应用于衰减混合了窄带和宽带成分的车内噪声。然而，在 HANC 系统中，NANC 子系统和 BANC 子系统被馈入一个共同的错误信号，该信号取决于来自两个子系统的组合次级信号。这会导致相互耦合的问题，从而影响降噪性能。为了解决这个问题，我们在本文中提出了一种改进的 HANC（MHANC）系统。在 MHANC 系统中，每个 ANC 子系统的误差信号是在估计的初级和次级信号的基础上独立合成的。请注意，当波动的实时发动机速度信号用于构建内部参考信号时，用于发动机阶次噪声控制的 NANC 系统的性能会下降。为了提高性能，通过平滑波动的发动机速度信号开发了增强型 NANC (ENANC) 系统。同时将ENANC系统纳入MHANC系统，形成增强型MHANC（EMHANC）系统。对实际驾驶条件下记录的车辆内部噪声进行了模拟。相应的结果证明了所提出的 MHANC 和 EMHANC 系统的优越性。增强型 NANC (ENANC) 系统是通过平滑波动的发动机转速信号而开发的。同时将ENANC系统纳入MHANC系统，形成增强型MHANC（EMHANC）系统。对实际驾驶条件下记录的车辆内部噪声进行了模拟。相应的结果证明了所提出的 MHANC 和 EMHANC 系统的优越性。增强型 NANC (ENANC) 系统是通过平滑波动的发动机转速信号而开发的。同时将ENANC系统纳入MHANC系统，形成增强型MHANC（EMHANC）系统。对实际驾驶条件下记录的车辆内部噪声进行了模拟。相应的结果证明了所提出的 MHANC 和 EMHANC 系统的优越性。