Linear Phase Sharp Transition BPF to Detect Noninvasive Maternal and Fetal Heart Rate

Figure 11

Using LPST BPF for MHR detection with fiduciary edges, ω_s1 = 10π and ω_s2 = 40π for record r01 (channel 3) of adfecgdb. (a) Frequency spectrum of the narrow BPF signal. (b) Amplitude squaring of maternal R-peaks. (c) Moving window integration and adaptive threshold. (d) Histogram of the MHR. (e) The true reference MHR plotted with our algorithm computed MHR.

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