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

Table 1

Summary of the tests.

Record number	SNR (dB)	Heart rate variation (bpm)	Accuracy rate
1	−4.4	108–159	92.3%
2	−6.6	108–159	91.9%
3	−8.1	108–156	90.1%
4	−10.2	108–159	89.1%
5	−14.8	108–168	89.7%
6	−17.2	108–156	90.1%
7	−20.1	108–177	88.5%
8	−23.8	111–153	88.8%
9	−25.6	111–168	82.0%
10	−26.7	108–168	81.0%

Note: the accuracy rate is defined in (9).