摘要
阈值函数的选取以及阈值的确定是小波收缩消噪的关键问题。首先建立了小波收缩消噪的统一框架:提出小波阈值消噪的广义阈值函数,推导了广义阈值函数阈值选取方法。其次在此框架下研究了如何选取最优阈值函数以及最优阈值。用6种具有不同特性不同信噪比的模拟信号,研究了具有代表性的阈值函数以及阈值的去噪性能,得到了优化的阈值函数以及阈值选取方案。最后将这种优化的消噪方法用于实际心电信号,取得了较好的效果。
The selections of threshold function and threshold value are crucial to wavelet shrinkage denoising. The generalized frame of wavelet threshold denoising is build： The Generalized threshold function of waveshrink is proposed. Methods of threshold value selections for generalized threshold functions are derived. Then under this frame, how to select threshold fuctions and thrweshold value are explored. Different signals with different features and varying SNR are considered to illustrate the performance of the dif- ferent threshold functions and different threshold value selections. The optimal denoising scheme is achieved. In end, the method is used to denoise the ECG signal, and the better performance is acquired.
出处
《传感技术学报》
CAS
CSCD
北大核心
2007年第3期601-605,共5页
Chinese Journal of Sensors and Actuators
基金
浙江省科技厅项目资助(2006C31010)
浙江省教育厅项目资助(20050480)
关键词
去噪
小波收缩
阈值函数
心电信号
denoising
wavelet shrinkage
threshold function
ECG signal
