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Development of a Fetal Heart Rate Detection Algorithm using Phonogram  

Kim, Dong-Jun (청주대학교 이공대 정보통신공학부)
Kang, Dong-Kee (청주대학교 이공대 전자공학과)
Publication Information
The Transactions of the Korean Institute of Electrical Engineers D / v.51, no.4, 2002 , pp. 167-174 More about this Journal
Abstract
This study describes a fetal heart rate(FHR) estimation algorithm using phonogram. Using a phonogram amplifier, various fetal heart sounds are collected in a university hospital. The FHR estimation algorithms consists of a lowpass filter, decimation, envelop detection, pitch detection, and post-processing. The post-processing is the FHR decision procedure using all informations of fetal heart rates. Using the algorithm and other parameters of fetal heart sound, a fetal monitoring software was developed. This can display the original signals, the FFT spectra, FHR and its trajectory. Even though the fetal phonogram amplifier detects the fetal heart sounds well, the sound quality is not so good as the ultrasonography. In case of very week fetal heart sound, autocorrelation of it showed clear periodicity. But two main peaks in one period is an obstacle in pitch detection and peaks are not so vivid. The proposed FHR estimation algorithm showed very accurate and stable results. Since the developed software displays multiple parameters in real time and has convenient functions, it will be useful for the phonogram-style fetal monitoring device.
Keywords
Electronic stethoscope; Fetal phonography; Fetal heart rate estimation;
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