Figure 7
From: A novel technique for fetal heart rate estimation from Doppler ultrasound signal
Graphic illustration of the segments shift and matching method. The first picture a) presents the way in which a new cardiac cycle duration is calculated, next three b), c), d), depict the principle of correction factor determination. If the mean difference between values Fk and the corresponding values of Ti intervals decreases after the interval displacement by either γ or -γ (where γ is equal to temporary window shift increment), the correction factor should be applied into the segment duration. In that case, the last interval duration is corrected by a factor ε = γ/4 or ε = -γ/4 respectively, which can be seen in e).