【作者】 罗丰； 吴顺君； 许进；

【Author】 Luofeng Wushunjun Xujin (the Key Lab for Radar Signal Processing Xidian University xi’an 710071)

【机构】 西安电子科技大学雷达信号处理重点实验室；

【摘要】 传统的实时信号处理消噪方法常采用FFT,但用其处理非平稳信号或奇异信号时效果并不明显。本文一方面基于信号、噪声在多尺度空间能量分布的差异而推出的Donoho非线性子波阈值消噪原理,另一方面从子波变换与FIR滤波器组的特定关系出发.在滤波卷积、下二采样过程中.将数据按一定规律重排,利用可编程逻辑器件CPLD对非平稳信号进行实时子波分解及阈值消噪的专用芯片进行了深入的研究.更多还原

【Abstract】 The metbed of the conventional FFT in real-time de-noising is not very efficiency for nonstationary signal or singular signal.Based on the theory of Donoho nonlinear de-noising from the difference of the energy in multi-scale transform between signal and noise,and on the relation between DWT and filter banks,this paper presents a ASIC chip with CPLD devices for real time de-noising in the process of threshold in DWT decosposition. It rearrange the data in a certain rule in filter decimator.更多还原