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Although clear fetal heart tones were auscultated with high-pitched tones, a sinusoidal fetal heart rate (FHR) was unable to be diagnosed, thus it was concluded that no fetal heart tone auscultation was suitable for the fetal monitoring. Fetal heart systolic period was stable and the diastolic duration varied when the FHR changed. FHR curve was traced with the triggers formed by single negative signal from the two tones of heart sound in the instantaneous FHR meter, of which microphone touching noise in FHR curve was prevented using autocorrelation heart rate meter, which made the automatic computerized FHR diagnosis successful.