EMD-IT去噪算法的阈值估计方法
张守成;韩元良;张玉洁
【期刊名称】《计算机工程与设计》 【年(卷),期】2014(000)012
【摘要】A threshold estimation method based on noise energy distribution for EMD‐IT was proposed to solve the difficulty of threshold determination .Firstly ,the noisy signal was decomposed using EMD and the noise energy of each level IMF was esti‐mated .Secondly ,the criterion that the total energy contained in the removed mode cells is equal to noise energy was used to esti‐mate the threshold based on the meaning of mode cell threshold .The method can avoid estimating threshold subjectively and it is selfadaptive .Finally ,simulations results with synthetic signals and real ECG signals verify the validity of the proposed method .%为解决EMD‐IT去噪算法中阈值难以确定的问题，提出一种基于高斯白噪声能量分布的阈值估计方法。将含噪信号进行经验模态分解并估计各固有模态函数（IM F ）中噪声的能量；根据模态单元阈值的含义，在各IM F中利用去除掉的模态单元包含的总能量等于噪声能量这一准则估计阈值。合成数据和实际心电信号的去噪仿真实验验证了该方法的有效性，其是自适应的且避免了阈值选择的主观性。 【总页数】4页(4386-4389)
【关键词】经验模态分解;固有模态函数;模态单元;高斯噪声;阈值参数 【作者】张守成;韩元良;张玉洁
EMD-IT去噪算法的阈值估计方法
