简化窄带频域无次级路径建模有源噪声控制算法
A Simplified Narrowband Frequency-Domain Active Noise Control Algorithm without Secondary Path Modeling
高原 1高敏 2郁国良1
作者信息
- 1. 中国计量大学信息工程学院,杭州 310018
- 2. 中国计量大学理学院,杭州 310018
- 折叠
摘要
针对采样频率较高的窄带有源噪声控制系统,在无需次级路径信息基础上,提出简化窄带频域有源噪声控制算法,该算法将参考信号采样点代人离散傅里叶变换(DFT)定义式,直接计算与其频域参考信号、误差信号相对应频率柜的幅度和相位信息,并将这些频率柜均匀分为多个子频率柜组,然后每个子频率柜组在0°、180°以及±90°四个不同的方向,搜索判断并选择出该组内最佳方向,更新自适应滤波器系数,从而实现窄带降噪.与FDFxLMS算法比较,所提算法避免了全频带频率柜信息全部参与计算,提高计算效率,当有效频率柜个数满足一定条件时,可减少计算量.分别以单频、复合频率和窄带信号为初级噪声源进行仿真,仿真结果表明在降噪量不减的情况下,所提算法具有良好的稳定特性和跟踪特性.
Abstract
For narrowband active noise control(ANC)systems with high sampling frequencies,a simplified narrowband frequency-domain ANC algorithm is proposed that does not require secondary path information.This algorithm directly calculates the amplitude and phase information of the frequency bins corresponding to the reference signal and error signal in the frequency domain by substituting the reference signal sampling points into the discrete Fourier transform(DFT)definition.These frequency bins are evenly divided into multiple sub-frequency bin groups.For each sub-frequency bin group,the optimal update direction for the adaptive filter coefficients is chosen from the four directions of 0°,180°,and ±90° to achieve narrowband noise reduction.Compared to the FDFxLMS algorithm,the proposed algorithm avoids the participation of all full-band frequency bins in the calculation,thereby improving computational efficiency.When the number of effective frequency bins meets certain conditions,the computational complexity can be reduced.Simulations using single frequency,multi-frequency,and narrowband noise as primary noise sources demonstrate that the proposed algorithm maintains good noise reduction performance while exhibiting excellent stability and tracking characteristics.
关键词
计量学/有源噪声控制/窄带/离散傅里叶变换/频率柜/相频响应Key words
metrology/active noise control/narrowband/discrete Fourier transform/frequency bin/phase response引用本文复制引用
基金项目
浙江省自然科学基金青年基金(LQ19A040003)
国家自然科学基金(51902300)
出版年
2024
NETL
NSTL
万方数据