摘要
抗噪声源时滞与实际电路器件的干扰都是影响有源降噪实际应用效果的潜在因素。针对物理实验中引起的抗噪声源尖峰噪声,分析物理实验抗噪声源中尖峰噪声的机理,并利用小波变换的门限消噪法,对由物理噪声产生的尖峰噪声进行处理。该方法中,门限阈值的选取与信号分解层数的确定是两个核心问题。利用层数自适应确定的小波阈值消噪法可以抑制有源噪声控制中产生的尖峰噪声,通过仿真验证该方法对抑制尖峰噪声有良好的效果。
Time delay of anti-noise sources and the interference of circuit elements are potential factors which influencethe application result of active noise control. In this paper, the mechanism of the peak noise of the anti-noise sources inphysical experiments was analyzed. Using the threshold de-noising method based on wavelet transform, the peak noise inducedby the physical noise was processed. Selection of the threshold and determination of signal decomposition order werethe two core problems of this method. It is shown that the wavelet threshold de-noising method determined by the decompositionorder can suppress the peak noise in the adaptive noise control. The effectiveness of this method is verified by the resultsof numerical simulation.
出处
《噪声与振动控制》
CSCD
2015年第1期195-199,213,共6页
Noise and Vibration Control
关键词
声学
有源噪声控制
尖峰噪声
门限消噪法
acoustics
active noise control
peak noise
threshold denoising method
