计算机应用与软件2024，Vol.41Issue(4)：256-261,6.DOI:10.3969/j.issn.1000-386x.2024.04.039
基于改进NMF与相位补偿的胎心音降噪算法
FETAL HEART SOUND DENOISING BASED ON IMPROVED NMF AND PHASE SPECTRUM COMPENSATION
摘要
Abstract
The fetal heart sound signal is collected by the sound sensor on the body surface of pregnant women,and the result usually contains a lot of noise.The commonly used filtering methods cannot achieve satisfactory noise reduction results.In order to better filter out the noise with the same frequency as the fetal heart sound signal,an improved non-negative matrix factorization was proposed.For the amplitude information matrix,the singular value decomposition was used to calculate the feature number and the initialization matrix for NMF.In addition,the L2,1 sparse limit was added to the NMF to make the features of the fetal heart sound obtained by decomposition more detailed.The phase spectrum compensation(PSC)with sparse limit was applied to the phase angle information matrix.The experimental results show that compared with the commonly-used noise reduction methods,the signal-to-noise ratio of this method is improved by at least 0.52 dB,which can better preserve the characteristics of fetal heart sound signals.关键词
胎儿心音/降噪/非负矩阵分解/相位补偿算法/稀疏限制Key words
Fetal heart sound/Denoising/NMF/Phase spectrum compensation/Sparse limit分类
信息技术与安全科学引用本文复制引用
傅晓雯,李霞..基于改进NMF与相位补偿的胎心音降噪算法[J].计算机应用与软件,2024,41(4):256-261,6.基金项目
浙江省自然科学基金项目(LY18E070005). （LY18E070005）
