摘要
次级通道建模是自适应主动噪声控制(AANC)系统的一个关键问题。应用一种基于时间扩展脉冲(TSP)信号的脉冲响应测量方法。TSP信号具有脉冲能量分布于一段时间的特性,将其作为被测系统的激励,再将其响应信号中的分散能量聚集,即可重构得到系统的脉冲响应函数。该方法被应用于AANC的次级通道建模,仿真和实验分别得到20dB和14dB的降噪效果。研究结果表明,该方法实现简单易行,结果准确可靠,非常适用于实际的ANC工程实验。
Secondary path modeling is a key issue of adaptive active noise control（AANC）system.An impulse response measurement based on time stretch pulse（TSP）signal is used in this paper.TSP signal has the characteristics of distributing the pulse energy in a period of time.The impulse response function of the tested system with TSP signal can be reconstructed by gathering the scattered energy in the response signal.The method is applied to secondary path modeling,and 20dB and 14dB noise reduction is respectively obtained in simulations and experiments.The results show that the secondary path modeling method based on TSP is simple,accurate and very suitable for practical ANC engineering test.
出处
《噪声与振动控制》
CSCD
北大核心
2011年第3期33-36,共4页
Noise and Vibration Control
关键词
声学
时间扩展脉冲
主动噪声控制
次级通道
仿真
acoustics
time-stretched pulse（TSP）
active noise control
secondary path
simulation
