【摘要】 采用固定系数滤波器和自适应滤波器相结合来实现一种有源抗噪声护耳器系统。固定系数滤波器除了降低宽带噪声,其最主要的作用在于减小次级通道的不确定性。固定系数滤波器和次级通道滤波器都采用H₂/H_∞优化方法设计得到。仿真和实验结果表明:固定系数滤波器提高了自适应算法的稳定性,护耳器系统在宽带和周期性噪声环境中都取得了比较好的降噪效果。更多还原

【Abstract】 A hybrid Active Noise Reduction （ANR） headset system with both fixed-coefficient and adaptive filters is investigated.Besides the broadband noise reduction,the main purpose of the fixed-coefficient filter is to reduce the uncertainty of the real secondary path.Both of the fixed-coefficient filter and the filter to model the real secondary path are optimized with the H₂/H_∞method.Computer simulations and experiments have been conducted and the results show that the fixed-coefficient filter stabilizes the updating process of the adaptive algorithm and the proposed ANR headset system works well in both the broadband and periodic noise environments.更多还原