摘要
实际中存在的噪声，一般都是窄带或有色宽带噪声（简称宽带噪声），而宽带噪声更为普遍．为使宽带自适应有源消声（ＡＡＮＣ）得到实际应用，必须保证宽带ＡＡＮＣ系统具有良好的稳定性和较高的降噪量．为此，本文对ＡＡＮＣ系统稳态性能作了理论分析和数值计算，得到了系统降噪量对噪声带宽、空间声传播通道、自适应滤波器参数等的依赖关系；以自由声场远场ＡＡＮＣ为例，从声学角度对ＡＡＮＣ系统作了物理解释，从而为改进宽带ＡＡＮＣ系统性能提供理论依据．
An Adaptive Active Noise Control (AANC) system is of practical use if andonly if its stability is guaranteed and a substantial broadband noise reduction is achieved. Inthis paper,steady state performances of the broadband AANC system are discussed and theeffect of system parameters which include the noise bandwidth, the acoustic transmissionpath and the parameters of the adaptive filter, etc. on Attenuation Level (AL) is analyzedand a physical mechanism of AANC is explained clearly taking AANC in the free farfieldsituation. The purpose of this paper is to provide a theoretical basis for improvement ofperformances of the broadband AANC system.
出处
《声学学报》
EI
CSCD
北大核心
1994年第2期101-109,共9页
Acta Acustica
