摘要
传统有源降噪(ANC)理论和系统希望将声场能量全部抵消,不能适用于存在信号情况下的ANC应用,为尝试解决这一问题,本文提出了一种新的将频域独立成分分析(ICA)技术用于频域ANC系统,对系统参考输入进行预处理的方法。ICA的分离作用可以减少参考输入和信号的相关性,显著降低信号对ANC控制滤波器的干扰,减少了信号的失真,提高了系统收敛前后的声场信噪比。理论分析和仿真实验表明:该系统具有传统ANC系统所不具备的信号背景下降低噪声的能力。
Traditional active noise cancellation (ANC) theories and system can’t be directly applied to cancel the noise when the useful signal and noise coexist in the sound field. Consequently, a new system with preprocessed reference input was proposed to solve this problem. Independent component analysis (ICA) in frequency domain was used to preprocess the reference input of ANC system with adaptive algorithm. With the method proposed, the correlation between signal and reference input is decreased. Hence, the interference between signal and ANC control filter is reduced, the signal distortion is decreased, and the signal-to-noise ratio after system convergence is increased remarkably. Theoretical analysis and computer simulations show that the proposed system has the reliable capability of ANC in sound field.
出处
《振动与冲击》
EI
CSCD
北大核心
2008年第8期81-84,179,共4页
Journal of Vibration and Shock
关键词
声学
有源降噪
独立成分分析
信噪比
信号失真度
Itakrua失真测度
underwater acoustics
active noise cancellation
independent component analysis (ICA)
signal-to-noise ratio
signal distortion
Itakrua distortion measure
