基于混合小波变换的瞬态信号检测方法

The Method of Instantaneous Pulse Detection Based on Hybrid Wavelet Transform

探讨了信号的小波变换与匹配滤波的关系 ,指出小波变换 (WT)实际上就是可变检测模板的匹配滤波过程。根据这一思想 ,提出了基于混合小波的信号检测方法。本文中 ,“混合小波变换”是指在小波分解和重构中分别使用不同的基本小波。其中分解小波用于实现可变模板的信号检测 ,重构小波则用以增强被检测信号的特征。我们用该方法对实测脑电信号 (EEG)中瞬态脉冲干扰进行检测。实验结果表明该方法能有效地检测出

In this paper, we discuss the relation between matched filter and wavelet transform (WT), and point out that wavelet transform is just the matched filter with changeable detection template. According to this idea, the method of signal detection based on hybrid wavelet transform (HWT) is proposed. HWT in this paper means that in WT decomposition and reconstruction, we use two different mother wavelets. One is used as a changeable template for the pulses detection and the other is used for the characteristic enhancement of detected pulse. This method has been applied to the interference pulse detection in EEG signal. The experiment result shows that HWT has the good property for instantaneous signal detection.