FETAL HEART SOUND DENOISING BASED ON IMPROVED NMF AND PHASE SPECTRUM COMPENSATION
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.
国家科技期刊平台
NSTL
万方数据
维普
