Fetal Heart Rate Monitoring from Phonocardiograph Signal Using Repetition Frequency of Heart Sounds

Table 2

Performance comparison.

Record number	SNR (dB)	The proposed method	Rule-based method [16]	Advanced method [14]
1	−4.4	92.3%	95.4%	96.2%
2	−6.6	91.9%	95.4%	96.1%
3	−8.1	90.1%	94.1%	96.3%
4	−10.2	89.1%	90.3%	94.5%
5	−14.8	89.7%	82.6%	90.4%
6	−17.2	90.1%	60.8%	86.7%
7	−20.1	88.5%	—	82.4%
8	−23.8	88.8%	—	63.6%
9	−25.6	82.0%	—	—
10	−26.7	81.0%	—	—

Note: (a) the accuracy rate is defined in (9). (b) “—” means that so many heart sound burst pairs were missed that the accuracy rate was very low.