Neurochip based on light-addressable potentiometric sensor with wavelet transform de-noising     

Qing-jun Liu  Wei-wei Ye  Hui Yu  Ning Hu  Li-ping Du  Ping Wang 《Journal of Zhejiang University. Science. B》2010,11(5):323-331

Neurochip based on light-addressable potentiometric sensor(LAPS),whose sensing elements are excitable cells,can monitor electrophysiological properties of cultured neuron networks with cellular signals well analyzed.Here we report a kind of neurochip with rat pheochromocytoma(PC12) cells hybrid with LAPS and a method of de-noising signals based on wavelet transform.Cells were cultured on LAPS for several days to form networks,and we then used LAPS system to detect the extracellular potentials with signals d...  相似文献   

小波包降噪在工业信号预处理中的应用     

吴洪艳  高国宏  李俊颖 《科技广场》2010,(3):115-117

针对工业过程数据含有噪声干扰的特点,本文提出了基于小波包分解的阈值降噪方法进行数据的降噪处理。以化工过程数据为例,通过MATLAB仿真实验,对比了小波包降噪、小波降噪、中值滤波三种方法的降噪效果。结果表明:小波包降噪具有明显的优越性。  相似文献   

基于小波去噪的快速定点ICA及其在振源识别中的应用     

武志勇  陈茜 《顺德职业技术学院学报》2006,4(1):6-8,12

在多源激励情况下,从传感器阵列输出的高维响应中分离、识别不同振源的性质,对于大型结构振动分析以及对其状态监测与健康评价有着重要的意义.本文结合大型结构振动的性质,介绍了小波阈值去噪原理,使用其改进的快速定点算法实现了多源激励情况下振源信息分离的方法.文中通过实例给出了这种方法的应用效果.  相似文献   

Applying sub-band energy extraction to noise cancellation of ultrasonic NDT signal     

Qi Zhang  Pei-wen Que  Wei Liang 《浙江大学学报(A卷英文版)》2008,9(8):1134-1140

In ultrasonic non-destructive tests, the echo signal at the flaw is highly complex due to the interference of multiple echoes with random amplitudes and phases, and is disturbed by all kinds of noises, such as thermal noise, digitalization noise, and structure noise. In this paper, the ultrasonic signal was decomposed by empirical mode decomposition （EMD） to obtain the intrinsic mode function （IMF） components according to ultrasonic defect echo signals occuring at the corresponding time, and the energy of the ultrasonic signal was concentrated. The IMF component selection criterion based on sub-band energy extraction was proposed to extract the ultrasonic signal component accurately and automatically from IMF components. When the selected IMF components were filtered by a band pass filter, the signal-to-noise ratio （SNR） was enhanced greatly.  相似文献   

Matlab小波分析在信号处理中的应用   总被引：1，自引：0，他引：1  

肖大雪 《科技广场》2011,(1):60-64

本文在对傅立叶变换和窗口傅立叶变换以及小波变换比较分析的基础上,重点探讨了Matlab小波分析对普通信号进行分析、消噪、压缩和奇异点检测等信号处理中的各种应用,并提出一些自己的看法。  相似文献   

基于小波的被动声纳降噪研究     

李峰  王毅  李枚毅 《宜春学院学报》2007,29(2):17-20,73

该文采用基于小波的降噪理论,研究了水下舰船辐射噪声的被动声纳降噪问题,在舰船辐射噪声的建模与仿真条件下,分析对比了不同方法对舰船辐射噪声信号降噪的效果,并分析比较了利用各种小波基和采用不同阈值条件下对信号进行降噪处理的效果.该研究在分析对比的基础上进行小波包软阈值去噪取得了较好的效果,对被动声纳降噪提供了较好的应用前景.  相似文献