[The Doppler fetal heart rate detection with wavelet transform].
Various interference and noises should be eliminated while picking up the signal of fetal heart rate from the Doppler fetal signal in order to obtain smooth curve of the fetal heart Doppler signal and so to figure out the fetal heart rate. In this study, the mean frequency shift curve estimated from the Doppler fetal signals was smoothed using wavelet transform. The results showed that the fetal-heart rate obtained by computing from the autocorrelation waveform based on the smoothed mean frequency shift curve was more accurate than that based on unsmoothed curve.
Zhang
Yufeng
Y
Department of Electronical Engineering, Information School, Yunnan University, Kunming 650091, China. yfengzhang@yahoo.com
Cao
Yi
Y
Zhang
Kexin
K
Yu
Wei
W
Shi
Xinling
X
D005260:Female; D005323:Fetal Monitoring; D006340:Heart Rate, Fetal / Q000502:physiology*; D006801:Humans; D011247:Pregnancy; D012815:Signal Processing, Computer-Assisted; D018608:Ultrasonography, Doppler / Q000379:methods*; D016216:Ultrasonography, Prenatal