一种改进的选频有源噪声控制算法

提出了一种改进的选频有源噪声控制(FSFANC)算法。一个FSFANC系统通过在信号输入通道中引入选频滤波器(FSF)选择一根待消除的谱线进行处理,多个FSFANC系统可以独立并行工作。本算法采用只含两个系数的有限冲击响应(FIR)结构对次级通道、初级通道、选频滤波器、控制滤波器等有关模块进行建模。理论分析和实验结果表明,当FSF中心频率一定时,即便噪声谱线频率与其有几赫兹的偏差系统也依然保持稳定。本算法结构简单,计算量小,收敛速度快,稳定性高,克服了现有FSFANC算法对频率偏差要求过于严格的限制。

A modified algorithm of the active noise control system based on frequency-selective filter

A modified algorithm of an Active Noise Control system based on Frequency-Selective Filter (FSFANC) is proposed. A FSFANC system selects and deals with one of the components by introducing a Frequency-Selective Filter (FSF) in the signal input channel, and multiple FSFANC systems in parallel can run independently. The proposed algorithm models each module, such as the primary path, the secondary path, the FSF and the control filter, with a simplified Finite Impulse Response (FIR) structure that includes only two coefficients. Theoretical analysis and laboratory experiments show that the system keeps stable even though the frequency of the component biases from that of the FSF by several Hz. The proposed algorithm possesses some advantages, such as simple structure, less computational burden, fast convergence rate, robust stability, and overcomes the limitation of the existing FSFANC algorithm that relied on the strict frequency equivalence of the FSF and the component to be cancelled.